Tricolor emitting and energy transfer in the phosphor Ba_2ZnSi_2O_7:Ce^(3+),Eu^(3+),Eu^(2+) for white-LED based near-UV chips  

作　　者：邓升智 邱忠贤 张茂美 周文理 张吉林 李承志 荣春英 余丽萍 廉世勋 

机构地区：[1]Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research (Ministry of Education) [2]Key Laboratory of Sustainable Resources Pro-cessing and Advanced Materials of Hunan Province College [3]College of Chemistry and Chemical Engineering Hunan Normal University [4]Changde Vocational Technical College

出　　处：《Journal of Rare Earths》2015年第5期463-468,共6页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(20971042);Specialized Research Fund for the Doctoral Program of Higher Education(20124306120005,20134306120009);Hunan Provincial Natural Science Foundation of China(2015JJ2100);Scientific Research Fund of Hunan Provincial Education Department(13C012);Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province

摘　　要：The red, green and blue （R/G/B） tricolor emitting phosphors Ba2ZnSi2O7 co-doped with Ce3＋and Eu3＋were synthesized in air atmosphere by a conventional high temperature solid-state reaction technique. All of the excitation spectrum of the phosphor Ba2ZnSi2O7：Ce,Eu showed a strong broad band absorption in the n-UV region whenever monitored by red （630 nm）-emitting or by green （500 nm）-and blue （402 nm）-emitting. Under the excitation of 330 nm, the emission spectrum containing a blue-violet emis-sion band, a green emission and four sharp lines originated from the characteristic transitions of Ce3＋, Eu2＋and Eu3＋ions, of which the relative intensities of the three emission bands could be controlled by the doping concentration of Ce3＋. The ca. CIE chromaticity co-ordinates （x=0.317, y=0.309） of the phosphor Ba1.94ZnSi2O7：0.03Eu,0.01Ce was very close to the standard white （x=0.33, y=0.33）, which suggested that it was a novel single-phased white-light emitting phosphor for LED-based near-UV chip. The mechanisms of energy transfer from Eu2＋to Eu3＋via Ce3＋was also discussed.The red, green and blue （R/G/B） tricolor emitting phosphors Ba2ZnSi2O7 co-doped with Ce3＋and Eu3＋were synthesized in air atmosphere by a conventional high temperature solid-state reaction technique. All of the excitation spectrum of the phosphor Ba2ZnSi2O7：Ce,Eu showed a strong broad band absorption in the n-UV region whenever monitored by red （630 nm）-emitting or by green （500 nm）-and blue （402 nm）-emitting. Under the excitation of 330 nm, the emission spectrum containing a blue-violet emis-sion band, a green emission and four sharp lines originated from the characteristic transitions of Ce3＋, Eu2＋and Eu3＋ions, of which the relative intensities of the three emission bands could be controlled by the doping concentration of Ce3＋. The ca. CIE chromaticity co-ordinates （x=0.317, y=0.309） of the phosphor Ba1.94ZnSi2O7：0.03Eu,0.01Ce was very close to the standard white （x=0.33, y=0.33）, which suggested that it was a novel single-phased white-light emitting phosphor for LED-based near-UV chip. The mechanisms of energy transfer from Eu2＋to Eu3＋via Ce3＋was also discussed.

关 键 词：rare earths Ba2ZnSi2O7：Eu Ce R/G/B tricolor emitting phosphor white-LEDs 

分 类 号：TQ422[化学工程]