MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Guanghao Li,Yang Zhao,Jiao Xu,Zhiyong Mao,Jingjing Chen,Dajian Wang
Two strategies, deviation of stoichiometry and addition of flux, were employed in this work to suppress the emergence of AlN impurity in the synthesis of CaAlSiN 3 :Eu 2+ phosphors under condition of atmospheric pressure. The influence of Al atoms deviation from ideal stoichiometry and SrF 2 flux addition on the suppression of AlN impurity and their resultant photoluminescence properties are investigated for CaAlSiN 3 :Eu 2+ phosphors. For a special Eu 2+ doping concentration (0.02 mol), AlN impurity was suppressed effectively when Al element deviation is 0.2 mol (CaAl 0.8 SiN 3 ) and the SrF 2 flux addition is 7 wt% during preparation of CaAlSiN 3 :Eu 2+ phosphors, respectively. The luminescent properties of CaAlSiN 3 :Eu 2+ phosphors are found to be enhanced significantly owing to the suppression of AlN impurity. In addition, the suppression mechanisms of AlN impurity in atmospheric pressure-synthesized CaAlSiN 3 :Eu 2+ phosphors are discussed. These results indicate the promising prospect for our proposed strategies in preparing high performance CaAlSiN 3 :Eu 2+ phosphors under the condition of atmospheric pressure.
研究领域:
材料科学
·
无机化学
·
固体发光
·
功能材料
·
光电子学
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2017
·
IF 1.671
Wang Jin,Zhang Haoran,Lei Bingfu,Dong Hanwu,Zhang Haiming,Liu Yingliang,Zheng Mingtao,Xiao Yong
Red-emitting nitridoaluminosilicate phosphor CaAlSiN3: Eu2+ was prepared by high temperature solid-state reaction method using calcium hydride (CaH2) as the reducing agent and calcium source. Influence of synthesis temperature on the crystalline structure,
morphology and photoluminescence properties of CaSiAlN3: Eu2+ was examined in detail. It was found that samples synthesized at low (1300∼1470 °C) or high (1650∼1700 °C) temperatures, had relatively poor composition, structural properties and performance,
such as wider half peak width and lower photoluminescence intensity. Meantime, the relevance of oxygen content and photoluminescence properties was discussed. After that, dependence of photoluminescence and diffuse reflection spectra on Eu2+ ion concentration was investigated. The
series of Ca1–x
Eu
x
AlSiN3 (x = 0.005∼0.12) phosphors showed broad excitation and absorption bands (200∼600 nm) and their peak positions redshifted from 642 to 681 nm with the Eu2+ ion content increasing. Surprisingly,
red persistent luminescence was observed in CaAlSiN3: Eu2+ with a longer duration in low Eu2+ concentration regions (x ≤ 0.01).
研究领域:
材料科学
·
发光材料
·
固态化学
·
荧光粉技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 12
·6941-6950
·
IF 3.502
Junhang Tian,Weidong Zhuang,Ronghui Liu,Yuanhong Liu,Guantong Chen,Ze Jiang,Xia Zhang,Wei Gao,Wenjin Li
To satisfy increasing stringent application requirements for high power wLEDs, we propose a superficial carbon modification method to enhance thermal stability of red-emitting CaAlSiN 3 :Eu 2+ phosphor via carbon coating by mechanical mixing and thermal post-treatment at high temperature under N 2 -H 2 atmosphere. The modifications on the crystal surface include (a) elimination of amorphous phase, (b) introduction of carbon and (c) inhibition of the oxidation of Eu 2+ . During the whole processing, the route of carbon and its effects on the crystal structure and luminescence properties are investigated by XPS, TEM, SEM, Raman spectra and TG-DSC analysis. After superficial carbon modification, the thermal quenching characteristic is improved by 5.7%, and the relative brightness decays more slowly during the aging test, which means that the superficial carbon modified samples still maintain good luminescence performance at high temperature and have superior performance for long-term applications. All above indicate that the superficial carbon modification method is a promising application to enhance the thermal stability for analogous Eu 2+ -activated nitride phosphors.
研究领域:
材料科学
·
荧光粉化学
·
固态照明
·
发光材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 26
·期 12
·10201-10206
·
IF 1.569
Li Guanghao,Chen Jingjing,Mao Zhiyong,Song Weiwei,Sun Tao,Wang Dajian
In this work, red-emitting nitride phosphor, CaAlSiN 3 :Eu 2+ , was synthesized successfully by carbothermal method using CaH 2 , AlN, Si 3 N 4 , Eu 2 O 3 and graphite powder under the condition of atmospheric pressure with a moderate temperature of 1550 °C for 6 h. In particular, graphite powder was employed as efficient and robust reducing agent in an optimal C/O mol ratio of 0.86. The obtained CaAlSiN 3 :Eu 2+ phosphors were well crystallized and showed an intense red emission band with peaks in the range of 642–675 nm dependent on the Eu 2+ doping concentration. Excellent thermal stability for as-synthesized Ca 1−x AlSiN 3 :xEu 2+ (x = 0.02–0.10) phosphors with absolute quantum efficiency about 20 % were demonstrated. These results presented here indicated the promising prospect for this economic and facile carbothermal synthesis route in preparing CaAlSiN 3 :Eu 2+ phosphors , and the phosphors are highly promising candidates for warm white LEDs.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yi Zhang,Ziying Chen,Zhenxu Lin,Jie Song,Hongliang Li,Youming Lu,Huihong Lin,Jingxiang Zhang,Dejian Hou,Jieji Zhu,Rui Huang
Particle engineering balances the scattering-luminescence trade-off in phosphor LSCs. • Mie theory and Monte Carlo modeling reveal size-dependent photon harvesting and transport. • Ball milling tunes size and annealing mitigates defects and limits emission loss. • A 100 cm 2 tandem LSC reaches a power conversion efficiency of 2.72%. Luminescent solar concentrators (LSCs) enable large-area solar harvesting and spectral conversion, but their performance is often limited by incomplete solar spectrum utilization and optical losses. Tandem architectures can broaden spectral harvesting. In phosphor-based tandem LSCs, however, particle-level scattering governs both light harvesting and waveguiding efficiency, and the trade-off between scattering and luminescence remains unresolved. Here, we report a scattering-assisted tandem LSC enabled by particle-engineered CaAlSiN 3 :Eu 2+ (CASN) phosphors. Theoretical scattering analysis and Monte Carlo ray tracing simulations show that reducing the particle size improves both solar harvesting and photon transport. To address this trade-off, a two-step post-treatment combining ball milling and rapid thermal processing was developed, in which thermal annealing mitigates milling-induced surface defects and largely preserves luminescence efficiency. The optimized single-layer LSC exhibits an increase in short-circuit current density from 1.48 to 1.99 mA/cm 2 and a power conversion efficiency of 1.56%. When integrated beneath a tetra(t-butyl)rubrene-based top layer, the scattering-assisted tandem LSC achieves a power conversion efficiency of 2.72%. These results establish CASN as a robust luminophore for tandem LSCs, show that powder-level characteristics strongly influence device performance, and offer a general particle engineering route toward high-efficiency scattering-assisted LSCs. Download: Download high-res image (177KB) Download: Download full-size image Particle-engineered CaAlSiN 3 :Eu 2+ phosphors enable a scattering-assisted tandem luminescent solar concentrator with enhanced solar harvesting and photon transport. Ball milling combined with rapid thermal processing preserves strong luminescence while optimizing particle scattering, leading to high external optical efficiency and tandem efficiency in a tandem device integrating tetra-tert-butylrubrene and CaAlSiN 3 :Eu 2+ phosphors.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 1
·715-720
·
IF 1.798
Yang Yanfang,Zhao Yang,Chen Jingjing,Mao Zhiyong,Li Guanghao,Xu Jiao,Wang Dajian,Fahlman Bradley D.
In this work, Eu 2+ doped CaAlSiN 3 red-emitting nitride phosphors were synthesized for the first time from less-expensive and air-stable entire oxides raw materials, CaCO 3 , SiO 2 , Al 2 O 3 , and Eu 2 O 3 , through a common carbothermal reduction and nitridation (CTRN) method. The synthetic reaction processes involving in this CTRN route and the phase components, photoluminescent properties for the resultant CaAlSiN 3 :Eu 2+ nitride phosphors were investigated in detail. The presented synthesis route using cost-effective entire oxides raw materials for preparation of CaAlSiN 3 :Eu 2+ nitride phosphors shows promising prospect in promoting the application of CaAlSiN 3 :Eu 2+ nitride phosphors in solid state lighting.
研究领域:
材料科学
·
固态化学
·
光学材料
·
荧光粉合成
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 17
·4445-4451
·
IF 4.696
Jin Wang,Haoran Zhang,Bingfu Lei,Zhiguo Xia,Hanwu Dong,Yingliang Liu,Mingtao Zheng,Yong Xiao
Red-emitting CaAlSiN3:Eu2+ phosphors with different doping contents have been synthesized by solid-state reaction using calcium hydride as a calcium source. The emergence of persistent luminescence in CaAlSiN3:Eu2+ was originated from electron traps introduced by the partial substitutions of O in N sites to form positive trap levels at low Eu2+ concentration. The broad thermoluminescence emission bands indicated multiple trap levels, in which the shallow traps were mainly responsible for the red persistent luminescence; besides, the deep trap electrons could be efficiently released under extra NIR (980 nm) stimulation, resulting in enhanced photoluminescence and phosphorescence. It is expected that the enhanced emission under UV-NIR simultaneous excitation may be a promising technique to investigate the trap distributions in optical energy storage materials.
研究领域:
材料科学
·
发光材料
·
光学物理
·
固态化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·Vol. 42
·期 1
·1756-1761
·
IF 2.605
Guanghao Li,Jingjing Chen,Zhiyong Mao,Weiwei Song,Tao Sun,Dajian Wang
A red-emitting Eu 2+ activated CaAlSiN 3 phosphor was successfully prepared via an atmospheric pressure solid-state reaction method with the aid of variable fluxes, namely SrF 2 , NH 4 F, BaF 2 , NaF, AlF 3 , CaF 2 and NH 4 Cl. The experimental results showed that the addition of SrF 2 flux effectively reduced the formation temperature of CaAlSiN 3 : Eu 2+ about 100 °C, improved the morphology of CaAlSiN 3 : Eu 2+ and suppressed the appearance of AlN impurity phase, suggesting that SrF 2 flux modifies the formation mechanism of CaAlSiN 3 : Eu 2+ . The phosphor of the CaAlSiN 3 :Eu 2+ produced with 4 wt% SrF 2 flux had an enhanced emission intensity, which was a result of the high crystallinity , the absence of AlN secondary phases, and the clean surfaces of the particles in the final product.
研究领域:
材料科学
·
光电子学
·
无机化学
·
荧光材料
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Yanyan Xie,Hongshuai Gao,Puyu Zhang,Congwen Qin,Yi Nie,Xue Liu
Biodegradable films prepared from cellulose have been developed in recent years. In this work, six kinds of wood cellulose films (WCFs) were successfully prepared using wood cellulose as raw materials and six ionic liquids (ILs) as solvents. The structure and properties of WCFs produced using six imidazole-based and 1,5-diazabicyclo[4.3.o]non-5-ene (DBN)-based ILs were investigated systematically. It indicated that the WCFs produced from 1-ethyl-3-methylimidazolium diethyl phosphate ([Emim]DEP) had a maximum transmittance of 90.1% and tensile strength of 124.5 MPa, which were much higher than the counterparts to 26.2% and 42.0 MPa of the WCFs produced using DBN-based ILs. Moreover, the structure and properties of WCFs and ILs had a little change after five recycles. Based on that, we used the screened [Emim]DEP as a solvent to prepare a highly efficient ultraviolet (UV)-to-red light conversion cellulose film (LCF) by doping rare-earth light-converting particles, CaAlSiN3:Eu2+ (CASN). Results showed that the LCF emitted red light at 640 nm and had excellent light conversion ability, which was conducive to photosynthesis.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 10
·3522-3530
·
IF 7.393
Zehua Liu,Pan Hu,Hangjie Jiang,Peng Sun,Yongfu Liu,Zhaohua Luo,Jingtao Xu,Zhengren Huang,Jun Jiang
Laser diode (LD) driven lighting is expected to be the next-generation lighting, and red CaAlSiN3:Eu2+ (CASN) phosphor is still required for high-quality LD white lighting. Utilizing glass with a suitable thermal expansion coefficient and low softening temperature as the inorganic binder, CASN phosphor-in-glass-films (PiFs) are fabricated in this work. High efficiency and thermal stability are achieved by optimizing the reaction of CASN and glass. Introducing Lu3Al5O12:Ce (LuAG) to offset the luminous spectra of CASN PiFs, broad emission spectra and high efficiency are recorded. High color rendering index (CRI, 88.6), luminous efficiency (LE, 153 lm W−1), and luminous flux (LF, 1162 lm) are achieved simultaneously when the PiFs are excited by a 455 nm blue LD. At last, the high color quality LD white lighting produced by PiFs is displayed for the first time. We believe that the results provided by this work are an enormous progress for PiFs and encourage more researchers to provide new strategies to acquire high performance of PiFs in white LD lighting.
研究领域:
光学材料
·
固态照明
·
光子学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 6
·862-873
·
IF 11.534
Huang Qiugui,Lin Hang,Wang Bo,Lin Shisheng,Wang Pengfei,Sui Ping,Xu Ju,Cheng Yao,Wang Yuansheng
Up-to-date laser-driven lightings confront a challenge of simultaneously achieving good photometric and chromatic performances. Herein, the coupling of “patterned package design” and “phosphor wheel” was proposed and demonstrated effectively to deal with this tough issue, based on a new architecture of CaAlSiN 3 :Eu 2+ (CASN:Eu) glass ceramic film (GCF) on Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce) GC plate. The fabricated composite has no interface between the two functional layers and retains the admirable luminescent features from CASN:Eu and YAG:Ce for the microstructural integrity during co-sintering. The studies on laser-microcrystalline interactions reveal that the luminescence saturation is almost determined by thermal quenching for YAG:Ce, but is ascribed to thermal/intensity quenching which are equally crucial for CASN:Eu. Benefiting from the elaborate architecture design, good color chromaticity tunability was obtained, and severe photon reabsorption was reduced. Moreover, accompanied with the rotation induced increase of thermal convection to air and pulse-like excitation, the constructed lighting engine under blue laser driven shows bright white light with luminous flux (LF) higher than 1000 lm, adjustable chromaticity from cool to warm, and improved color rendering index (CRI) approaching to 70.
研究领域:
光学
·
材料科学
·
照明工程
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2026
·
IF 9.7
Qianxing Huang,Chunliang Zhao,Jiaqi Cheng,Leqi Yao,Yan Dong,Chao Liang,Jinhua He,Jianqing Jiang,Qiyue Shao
Thermally induced interfacial reactions between nitride phosphors and glass matrices remain a critical bottleneck in the development of high-performance phosphor-in-glass (PiG) for high-power LED and laser-driven lighting applications. Herein, we address this challenge by the rational glass design to reconcile its glass transition temperature (T g ), structural stabilization and chemical compatibility. By establishing a correlation between structural evolution and interfacial diffusion, we develop a six-component glass matrix (CaF 2 -Al 2 O 3 -SiO 2 -B 2 O 3 -Na 2 O-P 2 O 5 ) featuring a low T g (∼453°C) and high chemical inertness. This glass matrix effectively alleviates the thermal degradation of embedded CaAlSiN 3 :Eu 2+ (CASN:Eu 2+ ) phosphors and suppresses interfacial reactions. The resulting CASN:Eu 2+ -PiG achieves a high internal quantum efficiency of ∼96%, and its fluorescence lifetime is relatively reduced by only 0.02 µs. A wLED incorporating Y 3 Al 5 O 12 :Ce 3+ and CASN:Eu 2+ in the PiG exhibits a high color rendering index of 90.4 while maintaining a luminous efficiency of 93.1 lm/W. Furthermore, by tuning the (Y,Gd) 3 Al 5 O 12 :Ce 3+ /CASN:Eu 2+ ratio in the PiG film, laser-driven amber light is achieved for specialized lighting, with a maximum luminous flux of 536.0 lm and a peak luminous efficiency of 101.6 lm/W. This work presents a universal strategy for designing chemically robust, low-melting glass to advance PiG applications in high-power solid-state lighting and specialty light sources.
✓ 已验证
DOI
高影响因子
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