OPTICS EXPRESS
·
2023
·Vol. 31
·期 15
·24914-24925
·
IF 3.8
Zitong Liu,Le Zhang,Le Zhang,Le Zhang,Le Zhang,Jian Kang,Jian Kang,Tianyuan Zhou,Tianyuan Zhou,Shiwei Chen,Shiwei Chen,Peng Yang,Bingheng Sun,Yang Li,Hao Chen,Hao Chen,Hao Chen
Ceramic phosphors are widely considered the next-generation phosphor material for white LED/LD lighting, and a wide spectrum is a key factor in improving the CRI of lighting sources. In this paper, a novel, to our knowledge, barcode-structured YAG:Ce/YAG:Ce,Mn ceramic phosphor was designed and fabricated. The lighting sources with the CRI value of 73.5 and 68.9 were obtained under the excitation of blue LEDs and blue LDs, respectively. Simultaneously, thanks to the effective supplementary emission from a red LD, the CRI of the ceramic-based lighting source reached 81.8 under blue LD excitation. Specifically, the microstructure and luminescent property of ceramic phosphors with different thicknesses and ion doping concentrations were systematically studied. Besides, by changing the blue power from 0.52 W to 2.60 W, the CCT of the laser lighting source with the encapsulation of optimized YAG:Ce/YAG:Ce,Mn ceramic phosphors ranged from 3928 K to 5895 K, while the CRI always maintained above 80. The above results indicate that barcode-structured Ce:YAG/Ce,MnYAG ceramic phosphor is a candidate to achieve a high CRI and ican be applied to various lighting occasions.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 46
·期 11
·17923-17928
·
IF 3.83
Jian Xu,Yang Yang,Ziquan Guo,Dennis Dan Corell,Baoli Du,Bingguo Liu,Haipeng Ji,Carsten Dam-Hansen,Ole B. Jensen
Recent studies revealed that both the Al 2 O 3 –Y 3 Al 5 O 12 :Ce (YAG:Ce) composite ceramic (YAG-CC) and single crystalline YAG:Ce (YAG-SC) possess very high luminescence-saturation thresholds (LSTs), which makes them promising for laser lighting applications. The present study is aimed to conduct a comparative investigation between YAG-CC and YAG-SC on aspects of the laser-pumped luminescence and the associated thermal behavior. The colorimetric and photometric properties (e.g. luminous flux/efficacy, correlated color temperature, and color rendering index) were investigated systematically, by conducting the measurements using a custom-built sphere-spectroradiometer system in the transmission mode. It was found that YAG-SC has a superior LST and it could maintain a high luminous efficacy (106 lm/W) under the irradiation of a 15.33 W blue laser , while the YAG-CC saturated at around 7.76 W. Moreover, by combining the thermal imaging data with the spectral variation of the YAG-CC, novel experimental insights into the origin of luminescence saturation were revealed and proposed as the “thermally-induced absorption saturation”.
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高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Yaqian Zhang,Jianming Liu,Yujie Zhang,Haisheng Yang,Yanxia Yu,Qingyun He,Xiaojuan Liang,Yongfu Liu,Weidong Xiang
At present, solid-state laser-driven lighting fabricated with blue laser diode (LD) and phosphor has been greatly developed in high-power lighting applications. The major obstacle is the luminescence saturation threshold of the fluorescence conversion material (YAG:Ce). In this work, we successfully prepared a series of high-quality and robust YAG:Ce single crystals . With high quantum efficiency (QE = 92%), regular crystal structure and high thermal conductivity , the single-crystal has excellent ability to deal with high radiation flux and thermal accumulation generated by high power. Matching the single-crystal with the laser, the luminous efficiency up to 274 lm/W and saturation threshold of 12 W/mm 2 were obtained. In addition, the influence of Ce doping concentration and sample processing conditions on the indicators in laser-driven white lighting was systematically studied. The results are of great significance and are believed to promote the development of solid-state laser-driven lighting.
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Xu Changyi,Ding Haifeng,Fan Guohua,Zhou Tianliang,Zhou Wenbin
Al 2 O 3 -based YAG:Ce PiG composite films have gained significant attention as optimal color converters for laser illumination due to their straightforward fabrication process and exceptional stability. However, the inherent limitations in the thermal conductivity of Al 2 O 3 result in a low pump utilization rate, making it challenging to achieve efficient white light output from PiG films. In this study, we introduce a novel laser illumination component composed of porous stainless steel (PSS) integrated with YAG:Ce/glass (PGiPSS), which has been sintered at 750 °C. The PSS demonstrates adequate thermal conductivity and the capacity to host a substantial number of luminescent particles within its pores, leading to enhanced quantum efficiency and reduced thermal quenching effects. Notably, when subjected to a 450 nm laser diode with a peak excitation power density of 24.10 W/mm 2 , the developed PGiPSS generated white light with a correlated color temperature (CCT) of 6693 K and an impressive luminous efficiency of 135.2 lm/W. These findings indicate that PGiPSS is a viable candidate for applications requiring high-power and high-brightness laser illumination.
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 12
·118396
·
IF 6.3
Jun Gao,Rui Fang,Mengmeng Li,Zhicai Zhang,Shuyao Li,Yang lv,Zhiqiang Hou,Chao Wang,Yao Tang,Haikuo Wang
YAG:Ce nanophosphors are crucial for advanced micro-optoelectronic devices but are fundamentally constrained by the severe trade-off between size and photoluminescence quantum yield (PLQY). This limitation makes it challenging to prepare high-quality materials that meet both ultra-small size (< 50 nm) and high-PLQY requirements. In this study, YAG:Ce nanophosphors (< 50 nm) exhibiting a high PLQY of 64% were successfully prepared through a co-precipitation method guided by experimental design, representing a significant advance in the field. YAG:Ce nano transparent ceramic (Nano-TC) was fabricated via the high-pressure and low-temperature sintering (HPLT, 7.7 GPa and 150 ℃). The Nano-TC shows an integrated performance of ∼50% PLQY, 65.04% transmittance at 750 nm, and a Vickers hardness of 18.59 GPa, representing a 47.31% improvement over the single crystal. This study demonstrates a viable pathway for fabricating nano-sized YAG:Ce phosphors that concurrently achieve miniaturization and extremely high PLQY, and establishes HPLT sintering as an effective route for translating these nanocrystals into high-performance Nano-TC for next-generation lighting and display applications.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·
IF 6.3
Qirui Pang,Huibin Tu,Hao Xue,Tianliang Zhou,Shuxing Li,Rong-Jun Xie
YAG:Ce-Al 2 O 3 composite phosphor ceramics exhibit exceptional thermal and optical properties, demonstrating remarkable resistance to high-power laser excitation and highly promising for laser-driven solid-state lighting. However, due to limitations in understanding the effects of raw materials, fabricating densely structured and homogeneously distributed composite ceramics via tape casting remains a significant challenge. In this study, we investigated effects of particle size and content of raw powders on rheological properties of slurry, microstructure and optical properties of composite phosphor ceramics. The YAG:Ce-70 wt% Al 2 O 3 composite phosphor ceramic, prepared by using nano-sized Y 2 O 3 and Al 2 O 3 , showed fully densified and homogeneous microstructure and demonstrated optimal optical properties. Under excitation at a blue laser power density of 21.20 W·mm -2 , the YAG:Ce-70 wt% Al 2 O 3 ceramic with a thickness of 0.2 mm created white light with a luminous flux of 1496.05 lm and 141.14 lm·W -1 . This work paves an avenue to large-scale production of high-performance phosphor ceramics.
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高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Yun Tang,Ben Liu,Nan Yan,Xiaoqiang He,Hudie Yuan,Yalou Xin,Hongfeng Yin
Widespread application of YAG:Ce-based white light-emitting diodes (WLEDs) is being challenged due to the lack of red emission, leading to their poor color rendering index (Ra) and high correlated color temperature (CCT). Perovskite quantum dots (QDs), presenting high photoluminescence quantum yield and simple fabrication process have been recognized as promising red-emitting component for warm WLEDs. However, conventional method by mechanically mixing QDs with YAG:Ce always results in undesirable dispersion due to their huge size difference. Moreover, the two components display different sinking behavior in silicone , which would further deteriorate the color uniformity of WLED. To address these issues, in this study, red-emitting MAPbBr 3-x I x QDs-coated YAG:Ce (A-YAG@QDs) composites were successfully prepared to further fabricate WLED with compensated red emission. The chemical coordination interactions between QDs and functionalized YAG:Ce make the two components behave as a whole, which effectively avoids the dispersion and sinking-related issues. The WLED, which combined blue LED chip and A-YAG@QDs composite, exhibited warm white light with low CCT of 4474 K, high Ra of 90.1 and high value of saturated red color component R9 as 95. This study demonstrated a promising strategy to prepare QDs-coated phosphor composites for the generation of warm white light for indoor lighting application.
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高影响因子
International Journal of Applied Ceramic Technology
·
2016
·Vol. 14
·期 1
·22-30
·
IF 1.534
Rui Ma,Bing Lu,Huiqun Cao,Juguang Hu,Xianghua Zhang,Qi Qiu,Ruisheng Zheng,Zhongkuan Luo,Bai Xue
We report the use of YAG:Ce phosphor as the raw material to make thin and transparent phosphor films with pulsed laser deposition including the effects of heating temperature, target–substrate distances, annealing times, and annealing atmosphere on the YAG:Ce 3+ phosphor film crystal types and spectral properties. The results indicated that at a coating temperature of 350°C, the YAG:Ce 3+ phosphor film had the best crystallinity with an intact film and maximum fluorescence emission. The crystallinity and fluorescence emission intensity of the film gradually decreased as a function of increasing target–substrate distances. As the annealing time increased, the crystallinity and the fluorescence emission intensity of the film first increased and then decreased. The film made with 5 h of annealing had the best crystallinity and the highest fluorescence emission intensity. The crystallinity of the film annealed under air was higher than that made under nitrogen; the fluorescence intensity of the film under air was slightly lower than the film under nitrogen. The emission peak of the prepared film was at 523 nm when excited at 450 nm. This is slightly blue-shifted versus the emission of commercial phosphor powders. This study offers a theoretical basis for the development of transparent phosphor films.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 4
·118965
·
IF 6.3
Liang Zhang,Haitao Zhang,Wentao Xu,Jiquan Huang,Youfu Zhou,Maochun Hong
YAG:Ce phosphor ceramics are important color converters for high-power LED lighting. Vat photopolymerization enables complex ceramic geometries, but mixed oxide systems require control of slurry stability, reactive densification, and structure-property relationships. YAG:Ce ceramics were fabricated by digital light processing (DLP) using reactive oxide precursors. A co-dispersant strategy produced a stable photocurable suspension with 51 vol% solid loading, supporting reliable printing. Optimized air calcination regulated precursor reaction and densification, giving vacuum-sintered ceramics with a dense microstructure, low porosity (0.03%), and high in-line transmittance (78.48% at 600 nm, 0.8 mm thickness). A hill-array ceramic was further fabricated. Compared with the flat counterpart of equivalent volume, the structured surface improved heat dissipation and light extraction, reducing peak temperature (by 37.5 °C at 90 W) and increasing luminous efficacy (from 172.02 to 185.54 lm/W at 50 W). These results indicate the potential of DLP-fabricated ceramics as color converters for high-power LED lighting applications.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yun Tang,Xiaoqiang He,Yuchao Zhang,Hudie Yuan,Yalou Xin,Xiaohu Ren,Qiang Chen,Hongfeng Yin
Widespread application of YAG:Ce-based white light-emitting diodes (WLEDs) is being challenged for their poor color rendering index (CRI) and high correlated color temperature (CCT) due to the lack of red emission. Organic-inorganic hybrid perovskite nanocrystals (MAPbX 3 PNCs, X = Cl, Br, I or mixture of them), presenting high photoluminescence quantum yield, tunable emission color and simple fabrication process have been recognized as promising red-emitting component for warm WLEDs. However, additional protection process for PNCs always needed due to their poor stability, which complicates the fabrication procedures of WLEDs. Besides, nano-sized PNCs and micron YAG:Ce powder display different sinking behavior in silicone , which also hard to ensure the uniform distribution of the two components and subsequently stable optical characteristics of the device. Herein, a one-pot anchoring strategy is implemented to realize the enhanced thermal and photo-stabilities of in-situ generated red-emitting MAPbBr 0.5 I 2.5 PNCs and simultaneously strong interaction between the PNCs and YAG:Ce to form PNCs@A-YAG composite, which greatly simplifies the processes, and also avoids the uneven distribution of phosphor and PNCs in silicone . Furthermore, the WLED, fabricated by PNCs@A-YAG and a commercial blue chip, exhibits high CRI of 92, low CCT of 4755 K, and super high saturated red color R9 of 95, which are of vital importance in achieving warm white light for indoor lighting applications. This work could promote the practical application of perovskite nanocrystals in the field of high color rendering index WLEDs.
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DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 42
·16147-16156
·
IF 8.067
Hailiang Fang,Beiying Zhou,Jiancheng Wang,Xiaobo Hu,Zesheng Pan,Shengjie Fan,Ping Huang,Shijia Gu,Lianjun Wang,Wan Jiang
Due to high thermal conductivity and excellent laser irradiation resistance, composite phosphor ceramics (CPCs) have been widely acknowledged as ideal color converters in laser lighting. However, achieving high-efficiency laser lighting is significantly limited by the inefficient utilization of pumping light. Microstructural tailoring is recognized as a promising strategy to improve the light extraction efficiency, while it is restricted by the harsh preparation conditions. Herein, we propose a novel Y2O3-YAG:Ce CPC controllably prepared from mesoporous Y2O3 powders and YAG:Ce phosphors using spark plasma sintering at a low temperature of 1160 °C. Attributed to the introduced Rayleigh scattering centers tailored by fine ceramic grains and well-matching of refractive indexes between the phosphor and the matrix, the Y2O3-YAG:Ce CPC exhibits an ultra-high relative internal quantum efficiency of 107% compared to that of the YAG:Ce phosphor. Impressively, when irradiated under a 450 nm laser diode, the as-prepared CPC produces white light with a high luminous efficiency of 178.42 l m W−1 and a low correlated color temperature of 4638 K, reflecting the enhanced light conversion efficiency. Furthermore, the CPC presents a remarkable improvement in thermal stability (only 6% luminescence loss at 200 °C) and is able to withstand a high laser flux density up to 6.16 W mm−2. These results demonstrate that the optimized Y2O3-YAG:Ce CPCs with designed microstructures are well suited for solid-state laser lighting with high power and brightness.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Lu Chen,Zhuangzhuang Ma,Jian Chen,Wang Guo
Laser-driven solid-state lighting has attracted much attention in recent years. However, the super-high luminous flux under high-power-density laser irradiation is accompanied by an enormous amount of heat. Here, to enhance the thermal robustness of phosphor converter materials, we prepared composite ceramics of YAG:Ce combined with high-thermal-conductivity MgO via simply vacuum sintering. 1.0 mol% MgF 2 was employed as the liquid-phase sintering additive to accelerate the densification process. The optimum temperature proves to be 1400 °C, at which MgO-YAG:Ce composites exhibit highly dense composite structure, without obvious reaction between MgO and YAG phases. Additionally, low sinterability of commercial YAG:Ce particles dragged down the densification process, which limits the YAG:Ce content of the composites. As a result, MgF 2 -doped MgO-10 vol% YAG:Ce composite ceramic (MYF10) sintered at 1400 °C exhibits the highest relative density of 99.33 % and thermal conductivity of 42.05 W/(m·K). Under 34.06 W/mm 2 blue laser excitation in a reflection mode, a stable laser-driven white light is obtained with the luminous flux of 2834 lm and luminous efficiency of 166 lm/W, respectively.
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高影响因子
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