Eu(TTFA)_3掺杂环氧基光刻胶薄膜的强烈红色荧光

Effective Red Fluorescence of Eu(TTFA)_3-doped Epoxy-based Photoresist Polymer Film

合成了稀土配合物Eu(TTFA)3(TTFA,2-thenoyltrifluoroacetone)掺杂的环氧基紫外负性光刻胶薄膜,采用荧光分光光度计对其光致发光特性进行了系统表征.荧光光谱分析表明,Eu(TTFA)3掺杂的光刻胶薄膜具有很宽的激发谱带(200～400 nm),且在长波紫外区表现为强激发,说明有机配体TTFA-与中心离子之间存在着比电荷迁移带更有效的能量传递.配体TTFA-的三重激发态和Eu3+的激发态能级匹配较好,能很好地敏化Eu3+而发出明亮的红光,是获得Eu3+红色荧光发射的优良配体,认证了有机配体与稀土离子之间产生有效能量传递的前提是存在"天线效应".

Eu （TTFA）3-doped epoxy-based negative photoresist polymer film is fabricated, and the photoluminescenee properties were systemically characterized. Fluorescence spectrometric analysis proves that the Eu（TTFA）3-doped photoresist film can be excited effectively in a broad excitation band （200 400nm） and indicates a strong excitation intensity in long wavelength ultraviolet range. And, the efficient complex interaction and energy transfer from ligand TTFA to Eu^3＋ are exposed and they are interpreted by electron-effect and energy-matching. Triplet excited state of TTFA is considered to be the key role in achieving the fluorescence sensitization of Eu^3＋ and TTFA is believed to be a good ligand for Eu^3＋ in red emitting. The energy transfer mechanism in the absorption processes of the red Eu^3＋ emissions was discussed and the ＂antenna effect＂ between the rare earth ions and the ligand was demonstrated.