Tricolor emitting and energy transfer in the phosphor Ba2ZnSi2O7:Ce3+,Eu3+,Eu2+for white-LED based near-UV chips

稀土学报(英文版), 2015, (5): 463-468. doi: 10.1016/S1002-0721(14)60441-5

邓升智 ^1, , 邱忠贤 ^2, , 张茂美 ^3, , 周文理 ^4, , 张吉林 ^5, , 李承志 ^6, , 荣春英 ^7, , 余丽萍 ^8, , 廉世勋 ^9,

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

Tricolor emitting and energy transfer in the phosphor Ba2ZnSi2O7:Ce3+,Eu3+,Eu2+for white-LED based near-UV chips

Keywords： rare earths

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.

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Tricolor emitting and energy transfer in the phosphor Ba2ZnSi2O7:Ce3+,Eu3+,Eu2+for white-LED based near-UV chips

参考文献