摘要
我们使用乙酰水杨酸 (aspirin)作为第一配体、邻菲罗琳 (phen)为第二配体 ,在乙醇溶液中合成了稀土发光配合物。元素分析和红外光谱证明它的分子组成为TbC2 7N2 O12 H2 8、分子式应为Tb(aspirin) 3 phen。光致发光研究表明导电高分子 (PVK)和稀土配合物之间存在F rster能量传递现象。这种能量传递的一个必要条件应该是稀土配合物的激发谱和高分子PVK的发射谱有重叠。稀土配合物掺杂高分子PVK的透射电镜照片表明稀土配合物在高分子PVK中分散比较均匀 ,分散尺度在 2 0～ 30nm之间。同时 ,我们发现高分子PVK和稀土配合物混合后不能均匀分散 ,这可能是影响电致发光器件寿命的一个因素。
A chloroform-soluble terbium complex, which is confirmed to be Tb(aspirin)(3)phen using element analysis and FT-IR spectroscopy, was synthesized. Photoluminescent investigation on the terbium complex and PVK-terbium complex composite was conducted. Forster energy transfer occurred between the terbium complex and the PVK matrix. There are no overlap between UV spectrum of the complex and the emission spectrum of PVK, however, overlap is observed between the excitation spectrum of the complex and the emission spectrum of PVK. Therefore, we suggest that the necessary condition of Forster energy transfer should be overlap between the excitation (not UV) spectrum of one complex and the emission spectrum of polymer matrix. Further investigation indicates that the emission of PVK can be suppressed at different extents by doping various amount of Tb(aspirin)(3)phen into PVK films. The ratio of Tb (aspirin)(3)phen: PVK = 1 :2 (wt%) are regarded as an optimized ratio for limiting the emission of PVK. TEM images of PVK/Tb(aspirin) 3 phen films reveal that nanoparticles of the Tb complex are dispersed in the PVK matrix. The size of the aggregated complex in PVK matrix is 20-30 nm. The film is not homogeneous as dark regions co-exist with light region in the TEM images. This phenomenon may be related to the short lifetime of electroluminescent devices.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2001年第6期740-744,共5页
Spectroscopy and Spectral Analysis
基金
国家重点基础研究发展规划项目 (G1 9980 61 30 7)
国家自然科学基金项目 (2 0 0 2 30 0 5)
