Biphasic (Lu,Gd)_(3)Al_(5)O_(12)-based transparent nanoceramic color converters for high-power white LED/LD lighting  

作　　者：Jie Fu Ying Zhang Shaowei Feng Mathieu Allix Cécile Genevois Emmanuel Veron Zhibiao Ma Wenlong Xu Linghan Bai Ruyu Fan Yafeng Yang Hui Wang Jianqiang Li 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]State Key Laboratory of Mesoscience and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China [3]CNRS,CEMHTI UPR 3079,Univ.Orléans,Orléans 45071,France [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]Beijing Key Laboratory for Advanced Powder Metallurgy and Particulate Materials,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Journal of Advanced Ceramics》2023年第12期2331-2344,共14页先进陶瓷（英文）

基　　金：This work is financially supported by the National Natural Science Foundation of China(No.51972304);Beijing Municipal Science&Technology Commission,Administrative Commission of Zhongguancun Science Park(No.Z221100006722022);the Project of Scientific Experiment on Chinese Manned Space Station,Chinese Academy of Sciences President’s International Fellowship Initiative for 2021(No.2021VEA0012);the Fundamental Research Funds for the Central Universities.The project benefitted from the microscopy facilities of the Platform MACLE-CVL which was co-funded by the European Union and Centre-Val de Loire Region(FEDER).Declaration of competing interest。

摘　　要：Ce doped Lu_(3)Al_(5)O_(12)(Ce:LuAG)transparent ceramics are considered as promising color converters for solid-state lighting because of their excellent luminous efficiency,high thermal quenching temperature,and good thermal stability.However,Ce:LuAG ceramics mainly emit green light.The shortage of red light as well as the expensive price of Lu compounds are hindering their application for white lighting.In this work,transparent(Lu,Gd)_(3)Al_(5)O_(12)–Al_(2)O_(3)(LuGAG–Al_(2)O_(3))nanoceramics with different replacing contents of Gd^(3+)(10%–50%)were successfully elaborated via a glass-crystallization method.The obtained ceramics with full nanoscale grains are composed of the main LuGAG crystalline phase and secondary Al_(2)O_(3) phase,exhibiting eminent transparency of 81.0%@780 nm.After doping by Ce^(3+),the Ce:LuGAG–Al_(2)O_(3) nanoceramics show a significant red shift(510 nm→550 nm)and make up for the deficiency of red light component in the emission spectrum.The Ce:LuAG–Al_(2)O_(3) nanoceramics with 20%Gd^(3+)show high internal quantum efficiency(81.5%in internal quantum efficiency(IQE),96.7%of Ce:LuAG–Al_(2)O_(3) nanoceramics)and good thermal stability(only 9%loss in IQE at 150℃).When combined with blue LED chips(10 W),0.3%Ce:LuGAG–Al_(2)O_(3) nanoceramics with 20%Gd^(3+)successfully realize the high-quality warm white LED lighting with a color coordinate of(0.3566,0.435),a color temperature of 4347 K,CRI of 67.7,and a luminous efficiency of 175.8 lm·W^(−1).When the transparent 0.3%Ce:LuGAG–Al_(2)O_(3) nanoceramics are excited by blue laser(5 W·mm^(−2)),the emission peak position redshifts from 517 to 570 nm,the emitted light exhibits a continuous change from green light to yellow light,and then to orange-yellow light,and the maximum luminous efficiency is up to 234.49 lm·W^(−1)(20%Gd^(3+)).Taking into account the high quantum efficiency,good thermal stability,and excellent and adjustable luminous properties,the transparent Ce:LuGAG–Al_(2)O_(3) nanoceramics with different Gd^

关 键 词：glass crystallization (Lu Gd)_(3)Al_(5)O_(12)(LuGAG)-Al_(2)O_(3)nanoceramics high-power WLEDs/LDs white lighting 

分 类 号：TN312.8[电子电信—物理电子学] TQ174.758.23[化学工程—陶瓷工业]