Spectral properties and Judd-Ofelt analysis of novel red phosphors Gd_(2)InSbO_(7):Eu^(3+)with high color purity for white LEDs  

作　　者：Yu Wang Baokui Zhao Bin Deng Shanshan Chen Yuanyuan Liu a Guodong Wang Ruijin Yu 

机构地区：[1]College of Chemistry&Pharmacy,Northwest A&F University,Yangling 712100,China [2]College of Science,Northwest A&F University,Yangling 712100,China [3]College of Chemistry&Biology and Environmental Engineering,Xiangnan University,Chenzhou 423043,China [4]Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application,Chenzhou 423043,China

出　　处：《Journal of Rare Earths》2021年第11期1327-1335,I0001,共10页稀土学报（英文版）

基　　金：Project supported by the Fundamental Research Funds for the Central Universities(2452019076);Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds and Applications(2019XGJSKFJJ01);the Construction Program of the Key Discipline in Hunan Province;the Education Department of Hunan Province(18A465);Science and Technology Plan of Chenzhou City(jsyf2017014)。

摘　　要：Gd_(2)InSbO_(7):Eu^(3+)red phosphors we re successfully synthesized via high-temperature solid-state reactio n.The phase purity,particle size,and luminescence properties of obtained phosphors were measured and analyzed in detail.The Gd_(2)InSbO_(7)lattice possesses cubic structure with F_(d-3 m)(227)space group.The phosphors emit bright red emission at 628 nm under 393 nm excitation,and this phenomenon is attributed to the^(5)D0-^(7)F_(2)transition.The Judd-Ofelt parameters(Ω_(2),Ω_(4)),transition ratio,and branching ratios(β)of Eu^(3+)-doped Gd_(2)InSbO_(7)phosphor were calculated on the basis of the emission spectra and decay lifetimes.The optimal content in Gd_(2)InSbO_(7):xEu^(3+)is identified to be 15 mol%.The thermal quenching of Gd_(2)InSbO_(7):Eu^(3+)is found to be over 500 K,and its activation energy is 0.26 eV.The Commission Internationale de l’Eclairage(CIE)chromaticity coordinates of Gd_(2)InSbO_(7):15%Eu^(3+)are(0.629,0.371),which are close to ideal red chromaticity coordinates(0.670,0.330).The fabricated w-LED exhibits good color rendering index(Ra)(86),correlated color temperature(CCT)(6997 K),and CIE chromaticity coordinates(0.302,0.330).The obtained results demonstrate that Gd_(2)InSbO_(7):Eu^(3+)phosphors have potential applications in white LEDs.

关 键 词：LUMINESCENCE PHOSPHOR ANTIMONATE Gd_(2)InSbO_(7) Rare earths 

分 类 号：TQ422[化学工程] TN312.8[电子电信—物理电子学]