用于白光发光二极管的 Ce3+ 和 Eu2+ 离子共掺杂 Ba2SiO4:xCe3+,0.02Eu2+ 绿色荧光粉的光谱特性和能量转移

[Spectral properties and energy transfer of Ce3+ and Eu2+ ions co-doped Ba2SiO4 : xCe3+, 0.02Eu2+ green phosphor for white LEDs].

作者信息

Liu Hong-li, He Da-wei, Shen Fang

机构信息

Ministry of Education Key Lab of Materials for Information Storage and Display, Institute of Photoelectron Technology, Beijing Jiaotong University, Beijing 100044, China.

出版信息

Guang Pu Xue Yu Guang Pu Fen Xi. 2006 Oct;26(10):1790-3.

PMID:17205721

Abstract

In the present paper, Ce3+ and Eu2+ co-doped silicate Ba2SiO4:xCe3+, 0.02Eu2+ green-emitting phosphors were synthesized by conventional solid-state reaction in a CO-reductive atmosphere. The diffuse reflection spectra, excitation spectra, and emission spectra of Ba2SiO4 : xCe3+, 0.02Eu2+ were measured and studied. Due to the good overlap between the Ce3+ emission bands and the Eu2+ excitation bands, the energy transfer between Ce3+ and Eu2+ is expected to be very efficient and is confirmed by the emission spectra of Ba2SiO4 : xCe3+, 0.02Eu2+. Co-doped Ba2SiO4 : xCe3+, 0.02Eu2+ is efficient green phosphors with the excitation of longer wavelength UV light, and the emission intensity is stronger than Eu2+ doped Ba2SiO4 phosphors. Analyzing the spectra, the authors draw a conclusion that the luminescence sensitization of Eu2+ by Ce3+ in Ba2SiO4 : xCe3+, 0.02 Eu2+ is due to the efficient energy transfer from Ce3+ to Eu2+ under long UV light.

摘要

在本文中，通过在CO还原气氛中采用传统的固态反应合成了Ce3+和Eu2+共掺杂的硅酸盐Ba2SiO4:xCe3+，0.02Eu2+绿色发光荧光粉。测量并研究了Ba2SiO4:xCe3+，0.02Eu2+的漫反射光谱、激发光谱和发射光谱。由于Ce3+发射带与Eu2+激发带之间有良好的重叠，预计Ce3+与Eu2+之间的能量转移非常有效，并且Ba2SiO4:xCe3+，0.02Eu2+的发射光谱证实了这一点。共掺杂的Ba2SiO4:xCe3+，0.02Eu2+是在较长波长紫外光激发下的高效绿色荧光粉，其发射强度比Eu2+掺杂的Ba2SiO4荧光粉更强。通过分析光谱，作者得出结论，在Ba2SiO4:xCe3+，0.02Eu2+中Ce3+对Eu2+的发光敏化是由于在长紫外光下Ce3+向Eu2+的有效能量转移。