基于液体基质材料的有机电致发光器件的制备及性能分析

摘要

利用液体基质材料9-(2-ethylhexyl)carbazole(EHCz)掺杂有机染料分子5,6,11,12-tetraphenyl-nathacene(rubrene)制备了具有液体发光层的有机电致发光器件,其结构为:ITO/PEDOT:PSS/EH Cz:rubrene/Cs2CO3/ITO,PEDOT:PSS和Cs2CO3分别作为空穴注入和电子注入材料.该器件在正向偏压时,得到了液体薄层EHCz:rubrene的电致发光,通过分析器件的发光光谱,可以确认器件的发光来自电子-空穴在rubrene分子上复合而形成的激子发光.该器件的最大外量子效率和亮度分别达到了0.03%和0.35cd·m-2,还进一步探讨了液体发光层的光致发光及荧光量子效率等特征.%An organic light-emitting diode (OLED) with a liquid host of 9-(2-ethylhexyl)carbazole (EHCz) doped with a guest dye of S,6, 11, 12-tetraphenylnapthacene (rubrene) was demonstrated. Here the poly(3, 4-ethylenedioxy thiophene) : poly (styrenesulphonate)(PEDOT: PSS) and Cs2CO3 were served as the hole injection material and electron injection material, respectively. The device structure consists of ITO/PEDOT: PSS/EH Cz : rubrene/Cs2CO3/ITO. Electroluminescence from rubrene with the highest external quantum efficiency of 0. 03％ at 0. 26 mA · crn-2 was obtained. The photoluminescence (PL) and PL quantum efficiency of the materials were further studied.