有机电致发光器件的磷光发光研究

Phosphorescent Emission from Organic Electroluminescent Device

研制了一种以铕钆络合物 (Eu0 .1 Gd0 .9) (TTA) 3(TPPO) 2 为发光材料的新型有机电致发光器件 ,观察到了三重态的磷光发光现象 ,分析表明此电致磷光发光是Gd3+ 对络合物配体电子自旋轨道强烈扰动引起的三重态发光。同时用积分球方法测定了该器件在不同温度下的光致发光和电致发光效率 ,结果表明此磷光发光有效地提高了器件的电致发光效率。

A novel organic electroluminescent device with EuGd complex (Eu0.1Gd0.9 (TTA)3 (TPPO)2 as an emitter was developed. The characteristics of this device were described and both fluorescence and phosphorescence were observed. This phenomenon is discussed in terms of yields of phosphorescence from the triplet excited state of the Gd and Eu chelates because of the paramagnetic Gd3+ ion strong perturbance to the spin-orbit levels of the complex. Both the photoluminescent and electroluminescent efficiencies at different temperature from 77 K to 300 K were measured by integrating sphere technique. The results imply that the phosphorescent emission from the triplets excited state might be a new way to increase the theoretical efficiency limit in electroluminescent devices.