Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, Guangdong 510275, China.
Opt Lett. 2010 Jul 15;35(14):2382-4. doi: 10.1364/OL.35.002382.
An intense bluish-green phosphor, CaLaGa(3)S(6)O:Ce(3+),Tb(3+), is developed. The photoluminescence excitation and emission spectra, the lifetime, and the concentration effect are investigated. The results show that an efficient nonradiative energy transfer from Ce(3+) to Tb(3+) occurs and its efficiency is about 11%. Although the efficiency is not high enough, these results demonstrate that a Tb(3+) ion with low 4f-4f absorption efficiency in the near-UV [(n)-UV] region can play the role of activator in a narrow green-emitting phosphor. This is potentially useful in (n)-UV (380-420 nm) GaN-based LEDs through efficient energy feeding by allowing 4f-5d absorption of Ce(3+) with high oscillator strength.
开发出一种强烈的蓝绿色荧光体 CaLaGa(3)S(6)O:Ce(3+),Tb(3+)。研究了其光致发光激发和发射光谱、寿命和浓度效应。结果表明，Ce(3+)到 Tb(3+)的非辐射能量转移效率约为 11%。尽管效率不是很高，但这些结果表明，在近紫外 [(n)-UV] 区域中 4f-4f 吸收效率较低的 Tb(3+)离子可以在窄带绿色发射荧光体中充当激活剂。通过允许具有高振子强度的 Ce(3+)的 4f-5d 吸收，从高效的能量供给方面来看，这在 (n)-UV（380-420nm）基于 GaN 的 LED 中具有潜在的应用价值。
