CaAl2Si2O8: Ce3+, Tb3+: A novel high-efficiency luminescent material for white light-emitting diodes

2018 3rd International Conference on Insulating Materials, Material Application and Electrical Engineering

材料科学;无线电电子学;电工学

Jiao, Haiyan^1 ; Chen, Qiong^1 ; Wang, Peiyu^1

College of Electric Engineering, Northwest MinZu University, Lanzhou, China^1

关键词: Efficient energy transfer;    Energy transfer mechanisms;    Luminescence properties;    Near-ultraviolet light-emitting diode;    Rare earth activated phosphors;    Solid state reaction method;    Weak reducing atmosphere;    White light emitting diodes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/452/2/022048/pdf
DOI  :  10.1088/1757-899X/452/2/022048

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A novel rare earth activated phosphor Ca1-x-yAl2Si2O8:xCe3+, yTb3+ were prepared under a weak reducing atmosphere by conventional solid-state reaction method and their luminescence properties under 351 nm excitation were investigated in detail. The results show that the CaAl2Si2O8: Tb3+ shows excited at short-UV region, the long-UV absorption peaks is very weak, which cannot be effectively excited by near ultraviolet light-emitting diodes (NUV-LEDs). However, by incorporation of Ce3+, in the excitation spectra, strong and broad excitation bands at ∼ 351nm were observed, which could well match with the emission wavelength of the NUV-LEDs chip. Simultaneity, the green characteristic emission of Tb3+ is obviously enhanced, and the emission intensity of CaAl2Si2O8:Ce3+, Tb3+ phosphor is 10 times higher than that of the green phosphor CaAl2Si2O8:Tb3+ phosphor. The results indicates an efficient energy transfer from Ce3+ to Tb3+ was found and the energy transfer mechanism of Ce3+ →Tb3+ was studied in detail.