Research Article
Luminescence Properties of Single-Component Broadband White Light Phosphors Based on Eu2+-Doped Ba7F12Cl2 Host
Issue:
Volume 14, Issue 5, October 2026
Pages:
156-162
Received:
12 July 2026
Accepted:
24 August 2026
Published:
4 September 2026
DOI:
10.11648/j.ajche.20261405.11
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Views:
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.
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 ...
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Research Article
Unsupported Hydrogenation Catalysts in Liquid-phase Oil Hydroprocessing Research
Yuandong Hou*,
Rongguan Li,
Zihao Li,
Shaohui Ge
Issue:
Volume 14, Issue 5, October 2026
Pages:
163-168
Received:
13 July 2026
Accepted:
27 August 2026
Published:
4 September 2026
DOI:
10.11648/j.ajche.20261405.12
Downloads:
Views:
Abstract: To meet stringent commercial fuel specifications, direct coal liquefied oil (DCL oil) must undergo comprehensive hydrotreating prior to utilization. However, conventional hydrotreating technologies and catalysts adapted from petroleum refining are often inadequate due to the distinct compositional and structural characteristics of DCL oil—namely, high concentrations of heteroatoms (S, N, O), elevated aromaticity, abundant polycyclic aromatic hydrocarbons (PAHs), and significant levels of unstable olefins and phenolic compounds. Compared to tradition impregnation process, unsupported catalyst is prepared by forming process. For realizing the consistency of active phase before and after forming, active phase should maintains chemical inertness and dispersibility at forming condition. Herein, these active phase property is named as modularized property. The advantage of modularized property is studied by the comparation between unsupported and supported catalyst, which prepared by catalyst forming process and impregnation process, respectively. In catalysts sulfide slab investigation, forming process enhances the distribution ratio of more than two stack layers, which benefit to catalytic activity. Its ratio is 1.5 times of the catalyst prepared by impregnation process. In catalytic activity evaluation, catalyst prepared by forming process maintains a higher catalytic activity.
Abstract: To meet stringent commercial fuel specifications, direct coal liquefied oil (DCL oil) must undergo comprehensive hydrotreating prior to utilization. However, conventional hydrotreating technologies and catalysts adapted from petroleum refining are often inadequate due to the distinct compositional and structural characteristics of DCL oil—namely, h...
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,
Qingfeng Tu
