摘要
合成了掺杂三价铽离子的邻苯二甲酸锶发光材料．测定了材料的热稳定性、晶体结构及紫外吸收光谱、激发光谱和发射光谱．研究了晶体中邻苯二甲酸根单线态Ｓл、л１，·、Ｓｎ、л１·跃迁吸收和由三线态Ｔл、л１·、Ｔｎ、л１·到铽（Ⅲ）离子５Ｄ４能级的能量传递机理．
he SrC8H4O4: Tb phosphor was prepared by the solution reaction method, and its thermal stability was examined. The powder X-ray diffraction and electron diffraction patterns were obtained. The SrC8H4O4: Tb crystal is a monoclinic, space group P21/n.Its lattice parameters were calculated to be α= 1. 4192, b= 0. 8018, c= 1. 3223nm,β= 100. 25 deg. The UV absorption, emission and excitationspectra were investigated.The energy transfer mechanism from C8H4O4 radical to Tb3+ ion was discussed. Underultraviolet excitation, the C8H4O4 radical is raised to singlet S л,л1 and S n, л1 excita tion states, it then decays from the tow states through intersystem crossing to triplet states T л, л1 and T n, л1, respectively. The T л, л1 state in the energy corresponds to 5D4 enerty level of Tb3+ ion, so that the excitation enrtgy is very easily transferred to Tb3+ion to result in very strong 5D4 -7F, emission. The T n, л1 state can transfer the energy to Tb+3ion, can also directly return to ground state by emitting blue fluorescence.
出处
《发光学报》
EI
CAS
CSCD
北大核心
1994年第3期242-248,共7页
Chinese Journal of Luminescence
关键词
发光材料
邻苯二甲酸锶
铽
掺杂
benzenedicarboxylic acid, strontium, terbium, phosphor, crystal structure
