发光学报, 2011, 32 (8): 779, 网络出版: 2011-08-29
Tb3+浓度对SrMoO4∶Tb3+发光性能的影响
Influence of Tb3+Concentration on The Luminescent Properties of SrMoO4∶Tb3+
摘要
采用溶胶-燃烧法合成了Tb3+掺杂的SrMoO4荧光粉并研究了它的发光性能。X射线衍射(XRD)显示, 前驱物在750 ℃下灼烧3 h得到的样品为纯相的SrMoO4。样品的激发谱由一宽带和一组窄峰组成, 其中激发强度较强的峰位于288 nm和375 nm。发射谱由4组窄带组成, 其中最强峰位于548 nm。对于548 nm(5D4→7F5 )发射峰, 最佳的Tb3+ 掺杂摩尔分数为0.05, 其浓度猝灭机理为Tb3+ 离子的电偶极-电偶极相互作用。当尿素用量为理论用量的3倍时, 发光强度最强。最佳烧结温度为750 ℃, 最佳烧结时间为3 h。当Tb3+摩尔分数为0.05时, 样品发光的CIE色坐标为(0.279 4, 0.565 2)。结果表明, Tb3+ 激活的SrMoO4是一种较好可应用于白光LED的紫外激发的绿光发光材料。
Abstract
Trivalent terbium (Tb3+) doped strontium molybdate (SrMoO4) was synthesized by sol-combustion method and the crystal structure and luminescent properties were investigated in this paper. The X-ray diffraction patterns (XRD) showed that the phosphors sintered at 750 ℃ for 3 h were pure SrMoO4 phase. The excitation spectrum consisted of a broad band and a series of narrow bands, in which the higher energy peaks located at 288 nm and 375 nm, respectively. The emission spectrum was composed of four narrow bands and the strongest emission peak was located at 548 nm. The appropriate doping molar fraction of Tb3+ was 0.05 for the 548 nm emission. The concentration quenching of 548 nm (5D4→7F5 ) was attributed to d-d interaction. When the dosage of urea was 3 times of theory dosage, the luminescent intensity reached the maximum. The optimal sintering temperature and time were 750 ℃ and 3 h, respectively. These results showed that this Tb3+ activated SrMoO4 was a promising green phosphor for ultraviolet (UV) and blue InGaN-based white LED.
关丽, 左金改, 刘冲, 孙明生, 刘海燕, 李旭, 杨志平, 傅广生. Tb3+浓度对SrMoO4∶Tb3+发光性能的影响[J]. 发光学报, 2011, 32(8): 779. GUAN Li, ZUO Jin-gai, LIU Chong, SUN Ming-sheng, LIU Hai-yan, LI Xu, YANG Zhi-ping, FU Guang-sheng. Influence of Tb3+Concentration on The Luminescent Properties of SrMoO4∶Tb3+[J]. Chinese Journal of Luminescence, 2011, 32(8): 779.