发光学报2011，Vol.32Issue(3)：256-261,6.DOI:10.3788/fgxb20113203.0256
白光LED用新型绿色荧光粉Ca5(SiO4)2F2∶Eu2+的发光性能
Luminescence Properties of New Cas ( SiO4 ) 2F2: Eu2 + Green Phosphors for White LEDs
摘要
Abstract
A series of new green-emitting phosphors, Eu2 + -activated Ca5_x Eux ( SiO4 )2 F2 were synthesized at 1 223 K by conventional high-temperature solid-state reactions under reductive atmosphere. And the photoluminescence excitation, diffuse reflectance and emission spectra, concentration quenching process, temperature dependence of luminescence and lifetime of phosphors were systematically investigated. The excitation spectrum shows that Ca5 (SiO4 )2F2: Eu2+ can be efficiently excited by the incident lights of 250 ～440 mn, perfectly matching with the emissions wavelength of near-UV LEDs. The emission intensity is influenced by the Eu2+content, and the optimal doping mole fraction is about O. 15. The concentration quenching mechanism was verified as dipole-dipole interaction and the value of the critical transfer distance was calculated as 1.5 nm.The temperature dependent emission spectra in the temperature range of 10 ～450 K show that the emission intensity at 450 K is 35％ of the emission intensity at 10 K. At room temperature, the lifetimes of Eu2+ ions in Ca4.85 Euo. 15 (SiO4)2 F2 phosphors are determined to be 1.78 μs and 7.79 μs, respectively. All of these indicate that Ca5 (SiO4)2 F2: Eu2+ is a promising green phosphor candidate for phosphor-converted white LEDs.关键词
白光LED/碱土卤硅酸盐/稀土Key words
white LED/ alkali earth chlorosilicates/ rare earth分类
数理科学引用本文复制引用
丁唯嘉,张梅,王静,苏锵..白光LED用新型绿色荧光粉Ca5(SiO4)2F2∶Eu2+的发光性能[J].发光学报,2011,32(3):256-261,6.基金项目
国家自然科学基金面上基金(20501023) （20501023）
2009年广东高校优秀青年创新人才培养计划(育苗工程)项目(LYM09031) （育苗工程）
华南农业大学211工程重点学科建设项目(2009B010100001) （2009B010100001）
华南农业大学校长科学基金(2007K031)资助 （2007K031）
