Emerging ultra-narrow-band cyan-emitting phosphor for white LEDs with enhanced color rendition  

作　　者：Ming Zhao Hongxu Liao Maxim S.Molokeev Yayun Zhou Qinyuan Zhang Quanlin Liu Zhiguo Xia 

机构地区：[1]The Beijing Municipal Key Laboratory of New Energy Materials and Technologies,School of Materials Sciences and Engineering,University of Science and Technology Beijing,100083 Beijing,China [2]Laboratory of Crystal Physics,Kirensky Institute of Physics,Federal Research Center KSC SB RAS,Krasnoyarsk,660036,Russia [3]Siberian Federal University,Krasnoyarsk 660041,Russia [4]Department of Physics,Far Eastern State Transport University,Khabarovsk 680021,Russia [5]State Key Laboratory of Luminescent Materials and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques,South China University of Technology,510641 Guangzhou,China

出　　处：《Light(Science & Applications)》2019年第1期869-877,共9页光（科学与应用)（英文版）

基　　金：supported by the National Natural Science Foundations of China(Grant Nos.51722202,51572023 and 91622125);Natural Science Foundations of Beijing(2172036);Fundamental Research Funds for the Central Universities(FRF-TP-18-002C1);the Guangdong Provincial Science&Technology Project(No.2018A050506004);the support from the Russian Foundation for Basic Research(Grant No.17-52-53031).

摘　　要：Phosphor-converted white LEDs rely on combining a blue-emitting InGaN chip with yellow and red-emitting luminescent materials.The discovery of cyan-emitting(470-500 nm)phosphors is a challenge to compensate for the spectral gap and produce full-spectrum white light.Na_(0.5)K_(0.5)Li_(3)SiO_(4):Eu^(2+)(NKLSO:Eu^(2+))phosphor was developed with impressive properties,providing cyan emission at 486 nm with a narrow full width at half maximum(FWHM)of only 20.7 nm,and good thermal stability with an integrated emission loss of only 7% at 150℃.The ultra-narrow-band cyan emission results from the high-symmetry cation sites,leading to almost ideal cubic coordination for UCr_(4)C_(4)-type compounds.NKLSO:Eu^(2+) phosphor allows the valley between the blue and yellow emission peaks in the white LED device to be filled,and the color-rendering index can be enhanced from 86 to 95.2,suggesting great applications in full-spectrum white LEDs.

关 键 词：white narrow YELLOW 

分 类 号：TN3[电子电信—物理电子学]