Li Xu, Guan Li, Liu Chong, Yang Zhi-Ping, Guo Qing-Lin
College of Physics Science & Technology, Hebei University, Baoding 071002, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2010 Jun;30(6):1535-8.
Ce3+, Tb3+ co-doped green phosphor Ca2SrAl2O6 was synthesized by solid state method and its excitation and emission spectra were measured and studied. The results showed that the emission spectrum is composed of four groups of narrow bands and the peaks are located at 497, 545, 595 and 623 nm. The strongest emission peak islocated at 545 nm and chromaticity coordinate (x, y) is (0.300 5, 0.500 2) at 4 mol% Ce3+ and Tb3+ doping, which indicate that Ca2SrAl2O6 : Ce3+, Tb3+ was a good green phosphor. The excitation spectrum for 545 nm was in the region of 320-400 nm, which indicated that this phosphor could be effectively excited by UVLED. Duo to the overlap of the Ce3+ emission bands and the Tb3+ excitation bands, the energy transfer between Ce3+ and Tb3+ is expected to be very efficient. The emission intensity of co-doped Ca2SrAl2O6 phosphor was stronger than that of Tb3+ doped phosphor. The luminescence intensity reached the maximum when the concentration of Ce3+ and Tb3+ was 4 mol%.
采用固相法合成了Ce3+、Tb3+共掺杂的绿色荧光粉Ca2SrAl2O6，并对其激发光谱和发射光谱进行了测量和研究。结果表明，发射光谱由四组窄带组成，峰值位于497、545、595和623nm处。最强发射峰位于545nm处，在Ce3+和Tb3+掺杂量为4mol%时，色度坐标（x，y）为（0.300 5，0.500 2），这表明Ca2SrAl2O6：Ce3+，Tb3+是一种良好的绿色荧光粉。545nm处的激发光谱在320-400nm范围内，这表明该荧光粉可被紫外发光二极管有效激发。由于Ce3+发射带与Tb3+激发带的重叠，预计Ce3+与Tb3+之间的能量转移非常有效。共掺杂Ca2SrAl2O6荧光粉的发射强度比Tb3+掺杂荧光粉的发射强度强。当Ce3+和Tb3+的浓度为4mol%时，发光强度达到最大值。
