Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host

Xianguo Meng; Qingfeng Tu; Yuxuan Wei; Qiulin Liang

doi:doi:10.11648/j.ajche.20261405.11

Research Article |

| Peer-Reviewed

Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu²⁺-Doped Ba₇F₁₂Cl₂ Host

Xianguo Meng^*

, Qingfeng Tu

, Yuxuan Wei

, Qiulin Liang

Published in American Journal of Chemical Engineering (Volume 14, Issue 5)

Received: 12 July 2026 Accepted: 24 August 2026 Published: 4 September 2026

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Abstract

With the continuous advancement of lighting technology, people’s pursuit of lighting quality has gradually shifted from simple power and brightness indicators to high-quality, healthy lighting and solar-like illumination. White light phosphors co-doped with multiple ions suffer from drawbacks including complicated ratio regulation, energy transfer loss, and thermally induced color drift, while single-component luminescent materials activated by a single rare-earth ion can effectively avoid the above deficiencies. In this work, a series of Ba_7-xF₁₂Cl₂: xEu²⁺ fluorochloride phosphors were successfully synthesized via a high-temperature solid-state reaction method. Their crystal structures, fluorescence spectra, thermal stability, and CIE chromaticity coordinates were systematically characterized. X-ray diffraction (XRD) results confirm that all as-prepared samples are pure phases, and Eu²⁺ doping does not destroy the crystal structure of the host matrix. Under excitation by near-ultraviolet light, the samples exhibit broad-band white light emission centered at 430 nm with a full width at half maximum (FWHM) of approximately 90 nm, which originates from the characteristic 4f⁶5d¹ → 4f⁷ transition of Eu²⁺. Thermal stability measurements reveal that the luminescence intensity of the samples remains above 95% of the room-temperature value at 85°C. The obtained results demonstrate that Ba₇F₁₂Cl₂: Eu²⁺ phosphors are promising single-component white light-emitting materials excited by near-ultraviolet light.

Published in	American Journal of Chemical Engineering (Volume 14, Issue 5)
DOI	10.11648/j.ajche.20261405.11
Page(s)	156-162
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2026. Published by Science Publishing Group

Keywords

Ba₇F₁₂Cl₂:Eu²⁺, Rare Earth Luminescent Materials, High-Temperature Solid-State Reaction Method, White Light-Emitting Diodes (WLEDs)

1. Introduction

With the rapid development of the lighting industry, people’s demands for lighting products are no longer limited to basic brightness. High-quality light sources featuring healthy illumination, a high color rendering index, and simulated natural sunlight have become the mainstream trend in industrial development

[1]

. Commercial white light-emitting diodes (WLEDs) usually achieve white light output by mixing multiple phosphors or co-doping multiple rare-earth ions. Nevertheless, such systems possess obvious inherent disadvantages: it is hard to precisely control the proportion of different luminescent ions, energy transfer between ions will cause luminous loss, and severe color drift tends to occur under high-temperature working conditions, which severely limits the long-term operational stability of devices

[2-5]

. In comparison, realizing white light emission in a single host with only one type of activator ion can fundamentally simplify the composition of phosphors and eliminate the inherent defects of multi-ion systems. Accordingly, broadband white luminescent materials activated by a single rare-earth ion have become an important research direction in the field of luminescent materials

[6]

As a classic activator with broadband emission, Eu²⁺ has 5d–4f transitions that are extremely sensitive to the external crystal field environment. Fluorochloride mixed halide hosts contain coordination fields of both F^— and Cl^— anions, which can form various inequivalent cation lattice sites in the crystal lattice and induce Eu²⁺ to generate superimposed multi-band broadband emission. Therefore, fluorochlorides are ideal host materials for constructing single-ion white light phosphors. Barium-based fluorochlorides have low phonon energy, simple synthesis routes, and remarkable compatibility with near-ultraviolet excitation light sources

[7, 8]

. To date, few studies have reported rare-earth-doped luminescence based on the Ba₇F₁₂Cl₂ fluorochloride host. The lattice site occupation behavior of Eu²⁺, the regulation rule of broadband white luminescence and thermal stability in this system remain to be systematically investigated

[9]

In view of the above reasons, Eu²⁺-doped Ba₇F₁₂Cl₂ phosphor is prepared by the high-temperature solid-state reaction method in this paper. Multiple characterization techniques including X-ray diffraction (XRD), steady-state photoluminescence spectroscopy, temperature-dependent luminescence tests and CIE chromaticity coordinates are utilized to systematically explore the effects of Eu²⁺ doping on phase structure, broadband white emission and thermal stability, and the luminescence mechanism of single-center Eu²⁺ broadband white light under near-ultraviolet excitation is further analyzed. This work expands the family of barium fluorochloride luminescent hosts and offers a new strategy for the design and fabrication of single-component healthy white phosphors excited by near-ultraviolet light.

2. Experimental Section

2.1. Materials and Methods

A single-component broadband white-emitting Ba₇F₁₂Cl₂: 0.009Eu²⁺ phosphor was successfully synthesized via a conventional high-temperature solid-state reaction method. Barium carbonate BaCO₃(A.R.), ammonium chloride NH₄Cl(A.R.), ammonium fluoride NH₄F(A.R.) and europium oxide Eu₂O₃(99.99%) were selected as raw materials and accurately weighed according to the designed stoichiometric ratio. The well-weighed mixtures were fully ground in an agate mortar for 30 min to achieve uniform component mixing. The homogeneous powders were transferred into an alumina ceramic crucible and calcined in a muffle furnace under a carbon powder reducing atmosphere with a two-stage sintering procedure: the samples were firstly pre-sintered at 360°C for 0.5 h, and then heated up to 800°C and held for 2 h. After the completion of chemical reaction, the crucible was cooled naturally to room temperature inside the furnace to avoid lattice defects caused by rapid quenching. The cooled bulk samples were reground for another 30 min to form fine homogeneous powders. Ba₇F₁₂Cl₂: 0.009Eu²⁺ phosphor was ultimately obtained.

2.2. Characterization Techniques

The crystal phase of all phosphor samples was identified by an X-ray diffractometer (XRD, SmartLab 3 kW, Rigaku) with Cu Kα radiation (λ = 0.1541 nm). The instrument parameters were set as: operating voltage of 40 kV, operating current of 40 mA, scanning range of 10°-90° and scanning rate of 0.02°/s. A phosphor excitation spectrum and thermal quenching analysis system (EX1000, Everfine) was utilized to measure the temperature-dependent luminescence spectra, CIE chromaticity coordinates, correlated color temperature and color purity of the samples. The photoluminescence excitation and emission spectra were recorded via a steady-state and transient fluorescence spectrometer (FLS980, Edinburgh Instrument). The absolute photoluminescence quantum yield was measured by an absolute quantum efficiency measurement system (Quantaurus-QY, Hamamatsu). Ultimately, the synthesized Ba₇F₁₂Cl₂: 0.009Eu²⁺ phosphor was mixed with commercial red-emitting (Ca, Sr)AlSiN₃: Eu²⁺ phosphor and packaged on a commercial 365 nm near-ultraviolet LED chip to fabricate WLED devices, and the comprehensive optoelectronic performances of the assembled WLEDs were further characterized.

3. Results and Discussion

3.1. Phase Analysis

Figure 1 shows that Ba₇F₁₂Cl₂ compound belongs to the hexagonal crystal system and crystallizes in the non-centrosymmetric hexagonal space group P-6 at room temperature. Its unit cell parameters are determined as a = b = 10.6589(2) Å and c = 4.1752(6) Å, which are slightly smaller than those of the standard hexagonal Ba₇F₁₂Cl₂ phase (a = b = 10.6844 Å, c = 4.1829 Å). This phenomenon can be attributed to the smaller ionic radius of Eu²⁺ (0.109 nm) compared with Ba²⁺ (0.135 nm). According to the substitution principle of similar ionic radii, it can be preliminarily concluded that Eu²⁺ ions replace Ba²⁺ cation sites and incorporate into the Ba₇F₁₂Cl₂ crystal lattice. Moreover, low-concentration Eu²⁺ doping does not change the crystal structure of the host matrix

[9, 10]

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Figure 1. Crystal structure of Ba₇F₁₂Cl₂.

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Figure 2. Ba₇F₁₂Cl₂: 0.009Eu²⁺ XRD pattern of phosphor.

Figure 2 displays the X-ray diffraction pattern of Ba₇F₁₂Cl₂: 0.009Eu²⁺ phosphor. By comparison with the standard card of Ba₇F₁₂Cl₂ (PDF#89-1826) and BaFCl (PDF#76-1368), nearly all diffraction peaks of the as-synthesized sample are well matched with the standard Ba₇F₁₂Cl₂ phase, while only a weak set of diffraction peaks correspond to the impurity BaFCl phase. The results confirm that the obtained sample is dominated by the pure Ba₇F₁₂Cl₂ main phase with a tiny amount of BaFCl impurity. It demonstrates that Eu²⁺ ions successfully substitute for Ba²⁺ ions in the host lattice at low doping content, and the crystal framework of Ba₇F₁₂Cl₂ host remains basically unchanged.

3.2. Fluorescent Spectra

Two spectra of Ba₇F₁₂Cl₂: 0.009Eu²⁺ phosphor were measured in the range of 225-750 nm, as shown in Figure 3, which are the excitation spectrum (magenta curve) at a monitoring wavelength of 430 nm and the emission spectrum (light cyan curve) at an excitation wavelength of 280 nm. The broad excitation band ranging from 240 to 360 nm originates from the electronic transition of Eu²⁺ from the ground 4f⁷ state to the excited 4f⁶5d¹ state

[11]

. This absorption band covers deep-ultraviolet and near-ultraviolet regions (250–360 nm), confirming that the phosphor can be efficiently pumped by commercial near-UV LED chips. Multiple split sub-peaks are observed in the excitation spectrum profile, which arise from inequivalent Ba²⁺ crystallographic sites in the host lattice. Diverse crystal field environments split the 5d energy levels of Eu²⁺, generating several discrete absorption bands

[8]

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Figure 3. Excitation and emission spectra of Ba₇F₁₂Cl₂: 0.009Eu²⁺ phosphor.

Upon excitation at 280 nm, a broad visible emission band peaking at 430 nm is detected, extending across 350–550 nm. This broadband emission is assigned to the parity-allowed 4f⁶5d¹ → 4f⁷ transition of Eu²⁺. The ultra-wide emission profile stems from multiple inequivalent cation sites occupied by Eu²⁺; distinct crystal field strengths at different lattice positions produce overlapping sub-bands, which combine to form a continuous broad band emission without co-doping other rare-earth activators

[9]

The wide excitation coverage in the near-UV region together with continuous broadband visible emission demonstrates that this barium fluorochloride phosphor is a promising single-component white-light emitter for near-UV-excited WLEDs, and the spectral results validate the strategy of realizing single-activator white luminescence via multi-site Eu²⁺ doping

[6]

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Figure 4. Excitation spectra of Ba₇F₁₂Cl₂: 0.009Eu²⁺ phosphor under different excitation wavelengths.

Figure 4 displays the photoluminescence emission spectra of the Ba₇F₁₂Cl₂: 0.009Eu²⁺ phosphor recorded under four distinct near-ultraviolet excitation wavelengths of 280 nm, 300 nm, 330 nm and 360 nm. All spectra retain identical broadband profiles with emission maxima fixed at 430 nm, which confirms that the intrinsic luminescence origin from the 4f⁶5d¹ → 4f⁷ transition of Eu²⁺ remains unchanged regardless of excitation wavelength

[7]

. No obvious shift of the peak position is observed across all excitation conditions, indicating that the crystal field environment around Eu²⁺ activators is stable and free from excitation-wavelength-dependent distortion.

Nevertheless, the luminescence intensity exhibits a remarkable declining trend as the excitation wavelength increases. The maximum emission intensity is achieved under 280 nm excitation, followed by 300 nm, 330 nm, and the weakest intensity is obtained at 360 nm. This tendency is consistent with the characteristic absorption range shown in the previous excitation spectrum: the phosphor possesses the strongest light absorption capacity within the 270–290 nm deep ultraviolet region, while absorption efficiency gradually weakens when the excitation wavelength shifts toward longer near-ultraviolet bands

[9]

Notably, even when excited at 360 nm, the sample still maintains considerable broadband white emission covering the whole visible region. This feature demonstrates that the Ba₇F₁₂Cl₂: Eu²⁺ phosphor can be effectively driven by a wide range of commercial near-UV LED chips spanning 280–360 nm. Combined with the CIE chromaticity coordinate variation trend mentioned above, tuning the excitation wavelength can rationally adjust the luminous color of the phosphor, which provides extra flexibility for optimizing the optical performance of near-UV pumped WLED devices

[11]

3.3. Quantum Yield

Fluorescence quantum yield (QY) is a crucial parameter for evaluating the performance of phosphors. The spectrum of Ba₇F₁₂Cl₂: 0.009Eu²⁺, measured with an integrating sphere under excitation at 350 nm, is shown in Figure 5. The following formula (1) can calculate the QY value of this phosphor

[12]

_{QY} = \frac{\int L_{S}}{\int E_{R} - \int E_{S}}

(1)

where L_S represents the luminescence spectrum of the Ba₇F₁₂Cl₂: 0.009Eu²⁺, E_S represents the excitation spectrum of the sample, E_R represents the excitation spectrum of reference BaSO₄, and ♒_QY is the photoluminescence quantum efficiency. The calculated QY value is 52.12%, which is lower than Y₃Al₅O₁₂: Ce³⁺ phosphors (QY = 97%) for commercial products

[13]

and (Sr, Ca)AlSiN₃: Eu²⁺ phosphors (QY = 92%) for LED application

[14]

. Even so, the QY recorded for the Ba₇F₁₂Cl₂:0.009Eu²⁺ luminescent powder remains far inferior to those of commercially available phosphors, which suggests that this phosphor possesses excellent practical application potential once its luminescence performance is further optimized.

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Figure 5. Excitation line of BaSO₄ and emission spectrum of Ba₇F₁₂Cl₂: 0.009Eu²⁺ phosphor collected by using an integrating sphere (λ_ex = 280 nm). The inset shows a magnification of the emission spectrum.

3.4. CIE Color Coordinate and Thermal Quenching Analysis

The color coordinate values describe the position of the phosphor within the color space, enabling researchers to choose the most suitable phosphor for particular applications. Figure 6 presents the CIE chromaticity coordinates of the Ba₇F₁₂Cl₂: 0.009Eu²⁺ phosphor measured under four distinct excitation wavelengths. As the excitation wavelength increases, the corresponding chromaticity coordinate points gradually shift toward the white light region on the Planckian locus. This trend verifies that the emission color of the Ba₇F₁₂Cl₂: 0.009Eu²⁺ phosphor can be effectively tuned to a certain extent by adjusting the near-ultraviolet excitation wavelength.

The color purity of phosphors is a crucial metric for assessing the saturation of their emitted light color, calculable via the subsequent formula (2)

[15]

Colorpurity = \sqrt{\frac{{(x - x_{i})}^{2} + {(y - y_{i})}^{2}}{{(x_{d} - x_{i})}^{2} + {(y_{d} - y_{i})}^{2}}} ×100%

(2)

where (x_i, y_i), (x_d, y_d) and (x, y) represent the illumination point, dominant wavelength, and the chromaticity coordinates of phosphors, respectively. In this work, the values of (x_i, y_i) and (x_d, y_d) are (0.333, 0.333) and (0.678, 0.320), respectively. Therefore, combined with the emission spectrum data of the phosphor, the values of color purity of the Ba₇F₁₂Cl₂: 0.009Eu²⁺ were calculated and displayed in Table 1.

Thermal stability tests show that the phosphor retains more than 95% of its initial room-temperature luminescence intensity at 85°C, demonstrating excellent thermal stability sufficient for practical commercial lighting applications.

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Figure 6. The chromaticity coordinates of Ba₇F₁₂Cl₂: 0.009Eu²⁺ sample at various excitation wavelengths.

Table 1. The CIE chromaticity coordinates, color purity of Ba₇F₁₂Cl₂: 0.009Eu²⁺ sample at various excitation wavelengths.

Ba₇F₁₂Cl₂: 0.009Eu²⁺	CIE (x, y)	Color purity
280 nm	(0.2273, 0.2278)	45.9%
290 nm	(0.2320, 0.2383)	43.2%
320 nm	(0.2656, 0.2806)	27.6%
360 nm	(0.2976, 0.3200)	13.1%

3.5. LED Packaging

Figure 7 illustrates the WLED device fabricated by combining white phosphor Ba₇F₁₂Cl₂: 0.009Eu²⁺ and red phosphor (Sr, Ca)AlSiN₃: Eu²⁺ in a specific ratio, followed by encapsulation and excitation using a 365 nm UV LED chip. In addition, the packaged LED device emits bright white light, with CIE chromaticity coordinates, correlated color temperature (CCT) and color rendering index (CRI) of (0.3689, 0.3942), 4428 K and 94.9, respectively. The experiment demonstrates that the WLED device emits bright white light when a forward current of 20 mA is applied. The device delivers high brightness and stable color performance, demonstrating great potential for practical illumination applications.

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Figure 7. The visible light spectrum and luminescence of Ba₇F₁₂Cl₂: 0.009Eu²⁺ packaged WLED.

4. Conclusions

In this work, a single-component fluorochloride white-emitting Ba₇F₁₂Cl₂:Eu²⁺ phosphor was successfully synthesized via the high-temperature solid-state reaction method. The crystal structure, optical spectroscopic characteristics, luminescence properties and thermal stability of the as-prepared materials were systematically investigated. XRD results reveal that all as-synthesized samples exhibit a pure crystalline phase. The Ba₇F₁₂Cl₂ host retains its complete crystal framework at suitable Eu²⁺ doping levels, which proves that this fluorochloride matrix has outstanding structural tolerance toward rare-earth ion doping. Upon near-ultraviolet excitation, the Ba₇F₁₂Cl₂:Eu²⁺ phosphor exhibits a broadband white emission band centered at 430 nm with a FWHM of 90 nm, which originates from the characteristic 4f⁶5d¹ → 4f⁷ electronic transition of Eu²⁺ ions. The realization of single-activator dominated broadband white emission effectively overcomes the inherent drawbacks of conventional multi-ion co-doped white light systems, including complex component ratio regulation, inevitable luminescence energy loss and poor color stability. Thermal stability characterization demonstrates that the luminescence intensity of the phosphor at 85°C remains higher than 95% of its room-temperature baseline value. The optimal Ba₇F₁₂Cl₂:Eu²⁺ phosphor possesses an absolute photoluminescence quantum yield of 52.12%. Furthermore, the WLED device fabricated with this phosphor emits bright natural white light with a high color rendering index (CRI = 94.9) and a correlated color temperature of 4428 K. Overall experimental results verify that the newly developed barium fluorochloride Ba₇F₁₂Cl₂ host can efficiently realize broadband white emission of Eu²⁺. As a high-performance single-component white phosphor with promising prospects for near-UV-excited WLEDs, this material offers a new host candidate and rational design strategy for developing healthy sunlight-simulating luminescent materials.

Abbreviations

XRD	X-ray Diffraction
FWHM	Full Width at Half Maximum
WLEDs	White Light-Emitting Diodes
QY	Quantum Yield
CCT	Correlated Color Temperature
CRI	Color Rendering Index

Author Contributions

Xianguo Meng: Conceptualization, Resources, Data curation, Supervision

Qingfeng Tu: Investigation, Experiment, Software, Writing-original draft

Yuxuan Wei: Methodology, Investigation, Experiment, Formal Analysis

Qiulin Liang: Experiment, Formal Analysis

Funding

This work was supported by the Scientific Research Project for High-Level Talents of Beibu Gulf University (23KYQD26).

Data Availability Statement

The data supporting the outcome of this research work has been reported in this manuscript.

Conflicts of Interest

The authors declare no conflicts of interest.

Appendix

Appendix should be placed at the end of the paper, numbered in Arabic numerals, and cited in the text. If the Appendix includes one or more figures, please continue the consecutive numbering from the main text.

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APA Style

Meng, X., Tu, Q., Wei, Y., Liang, Q. (2026). Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host. American Journal of Chemical Engineering, 14(5), 156-162. https://doi.org/10.11648/j.ajche.20261405.11

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ACS Style

Meng, X.; Tu, Q.; Wei, Y.; Liang, Q. Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host. Am. J. Chem. Eng. 2026, 14(5), 156-162. doi: 10.11648/j.ajche.20261405.11

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AMA Style

Meng X, Tu Q, Wei Y, Liang Q. Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host. Am J Chem Eng. 2026;14(5):156-162. doi: 10.11648/j.ajche.20261405.11

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@article{10.11648/j.ajche.20261405.11,
  author = {Xianguo Meng and Qingfeng Tu and Yuxuan Wei and Qiulin Liang},
  title = {Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host},
  journal = {American Journal of Chemical Engineering},
  volume = {14},
  number = {5},
  pages = {156-162},
  doi = {10.11648/j.ajche.20261405.11},
  url = {https://doi.org/10.11648/j.ajche.20261405.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajche.20261405.11},
  abstract = {With the continuous advancement of lighting technology, people’s pursuit of lighting quality has gradually shifted from simple power and brightness indicators to high-quality, healthy lighting and solar-like illumination. White light phosphors co-doped with multiple ions suffer from drawbacks including complicated ratio regulation, energy transfer loss, and thermally induced color drift, while single-component luminescent materials activated by a single rare-earth ion can effectively avoid the above deficiencies. In this work, a series of Ba7-xF12Cl2: xEu2+ fluorochloride phosphors were successfully synthesized via a high-temperature solid-state reaction method. Their crystal structures, fluorescence spectra, thermal stability, and CIE chromaticity coordinates were systematically characterized. X-ray diffraction (XRD) results confirm that all as-prepared samples are pure phases, and Eu2+ doping does not destroy the crystal structure of the host matrix. Under excitation by near-ultraviolet light, the samples exhibit broad-band white light emission centered at 430 nm with a full width at half maximum (FWHM) of approximately 90 nm, which originates from the characteristic 4f65d1 → 4f7 transition of Eu2+. Thermal stability measurements reveal that the luminescence intensity of the samples remains above 95% of the room-temperature value at 85°C. The obtained results demonstrate that Ba7F12Cl2: Eu2+ phosphors are promising single-component white light-emitting materials excited by near-ultraviolet light.},
 year = {2026}
}

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TY  - JOUR
T1  - Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host
AU  - Xianguo Meng
AU  - Qingfeng Tu
AU  - Yuxuan Wei
AU  - Qiulin Liang
Y1  - 2026/09/04
PY  - 2026
N1  - https://doi.org/10.11648/j.ajche.20261405.11
DO  - 10.11648/j.ajche.20261405.11
T2  - American Journal of Chemical Engineering
JF  - American Journal of Chemical Engineering
JO  - American Journal of Chemical Engineering
SP  - 156
EP  - 162
PB  - Science Publishing Group
SN  - 2330-8613
UR  - https://doi.org/10.11648/j.ajche.20261405.11
AB  - With the continuous advancement of lighting technology, people’s pursuit of lighting quality has gradually shifted from simple power and brightness indicators to high-quality, healthy lighting and solar-like illumination. White light phosphors co-doped with multiple ions suffer from drawbacks including complicated ratio regulation, energy transfer loss, and thermally induced color drift, while single-component luminescent materials activated by a single rare-earth ion can effectively avoid the above deficiencies. In this work, a series of Ba7-xF12Cl2: xEu2+ fluorochloride phosphors were successfully synthesized via a high-temperature solid-state reaction method. Their crystal structures, fluorescence spectra, thermal stability, and CIE chromaticity coordinates were systematically characterized. X-ray diffraction (XRD) results confirm that all as-prepared samples are pure phases, and Eu2+ doping does not destroy the crystal structure of the host matrix. Under excitation by near-ultraviolet light, the samples exhibit broad-band white light emission centered at 430 nm with a full width at half maximum (FWHM) of approximately 90 nm, which originates from the characteristic 4f65d1 → 4f7 transition of Eu2+. Thermal stability measurements reveal that the luminescence intensity of the samples remains above 95% of the room-temperature value at 85°C. The obtained results demonstrate that Ba7F12Cl2: Eu2+ phosphors are promising single-component white light-emitting materials excited by near-ultraviolet light.
VL  - 14
IS  - 5
ER  -

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Xianguo Meng

College of Science, Beibu Gulf University, Qinzhou, China

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http://orcid.org/0009-0003-1530-6002
Qingfeng Tu

School of Optoelectronics and Communication Engineering, Xiamen University of Technology, Xiamen, China

http://orcid.org/0009-0001-2369-184X
Yuxuan Wei

School of Optoelectronics and Communication Engineering, Xiamen University of Technology, Xiamen, China

http://orcid.org/0009-0007-6927-595X
Qiulin Liang

College of Science, Beibu Gulf University, Qinzhou, China

http://orcid.org/0009-0008-9628-6520

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Table 1

Table 1. The CIE chromaticity coordinates, color purity of Ba₇F₁₂Cl₂: 0.009Eu²⁺ sample at various excitation wavelengths.

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APA Style

Meng, X., Tu, Q., Wei, Y., Liang, Q. (2026). Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host. American Journal of Chemical Engineering, 14(5), 156-162. https://doi.org/10.11648/j.ajche.20261405.11

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ACS Style

Meng, X.; Tu, Q.; Wei, Y.; Liang, Q. Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host. Am. J. Chem. Eng. 2026, 14(5), 156-162. doi: 10.11648/j.ajche.20261405.11

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AMA Style

Meng X, Tu Q, Wei Y, Liang Q. Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host. Am J Chem Eng. 2026;14(5):156-162. doi: 10.11648/j.ajche.20261405.11

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@article{10.11648/j.ajche.20261405.11,
  author = {Xianguo Meng and Qingfeng Tu and Yuxuan Wei and Qiulin Liang},
  title = {Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host},
  journal = {American Journal of Chemical Engineering},
  volume = {14},
  number = {5},
  pages = {156-162},
  doi = {10.11648/j.ajche.20261405.11},
  url = {https://doi.org/10.11648/j.ajche.20261405.11},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajche.20261405.11},
  abstract = {With the continuous advancement of lighting technology, people’s pursuit of lighting quality has gradually shifted from simple power and brightness indicators to high-quality, healthy lighting and solar-like illumination. White light phosphors co-doped with multiple ions suffer from drawbacks including complicated ratio regulation, energy transfer loss, and thermally induced color drift, while single-component luminescent materials activated by a single rare-earth ion can effectively avoid the above deficiencies. In this work, a series of Ba7-xF12Cl2: xEu2+ fluorochloride phosphors were successfully synthesized via a high-temperature solid-state reaction method. Their crystal structures, fluorescence spectra, thermal stability, and CIE chromaticity coordinates were systematically characterized. X-ray diffraction (XRD) results confirm that all as-prepared samples are pure phases, and Eu2+ doping does not destroy the crystal structure of the host matrix. Under excitation by near-ultraviolet light, the samples exhibit broad-band white light emission centered at 430 nm with a full width at half maximum (FWHM) of approximately 90 nm, which originates from the characteristic 4f65d1 → 4f7 transition of Eu2+. Thermal stability measurements reveal that the luminescence intensity of the samples remains above 95% of the room-temperature value at 85°C. The obtained results demonstrate that Ba7F12Cl2: Eu2+ phosphors are promising single-component white light-emitting materials excited by near-ultraviolet light.},
 year = {2026}
}

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TY  - JOUR
T1  - Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host
AU  - Xianguo Meng
AU  - Qingfeng Tu
AU  - Yuxuan Wei
AU  - Qiulin Liang
Y1  - 2026/09/04
PY  - 2026
N1  - https://doi.org/10.11648/j.ajche.20261405.11
DO  - 10.11648/j.ajche.20261405.11
T2  - American Journal of Chemical Engineering
JF  - American Journal of Chemical Engineering
JO  - American Journal of Chemical Engineering
SP  - 156
EP  - 162
PB  - Science Publishing Group
SN  - 2330-8613
UR  - https://doi.org/10.11648/j.ajche.20261405.11
AB  - With the continuous advancement of lighting technology, people’s pursuit of lighting quality has gradually shifted from simple power and brightness indicators to high-quality, healthy lighting and solar-like illumination. White light phosphors co-doped with multiple ions suffer from drawbacks including complicated ratio regulation, energy transfer loss, and thermally induced color drift, while single-component luminescent materials activated by a single rare-earth ion can effectively avoid the above deficiencies. In this work, a series of Ba7-xF12Cl2: xEu2+ fluorochloride phosphors were successfully synthesized via a high-temperature solid-state reaction method. Their crystal structures, fluorescence spectra, thermal stability, and CIE chromaticity coordinates were systematically characterized. X-ray diffraction (XRD) results confirm that all as-prepared samples are pure phases, and Eu2+ doping does not destroy the crystal structure of the host matrix. Under excitation by near-ultraviolet light, the samples exhibit broad-band white light emission centered at 430 nm with a full width at half maximum (FWHM) of approximately 90 nm, which originates from the characteristic 4f65d1 → 4f7 transition of Eu2+. Thermal stability measurements reveal that the luminescence intensity of the samples remains above 95% of the room-temperature value at 85°C. The obtained results demonstrate that Ba7F12Cl2: Eu2+ phosphors are promising single-component white light-emitting materials excited by near-ultraviolet light.
VL  - 14
IS  - 5
ER  -

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