Zhao Juan, Yu Jun-sheng, Wen Wen, Jiang Ya-dong
State Key Laboratory of Electronic Thin Film and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2011 May;31(5):1189-92.
The photoluminescence (PL) spectra and UV-Visible absorption spectra of a novel yellow phosphor dye of bis[2-(4-tert-butylphenyl)benzothiazolato-N,C2'] iridium (acetylacetonate) denoted as (t-bt)2Ir(acac) were systematically investigated, which were measured in solution and film states with various concentrations. The results showed that the highest PL intensity was achieved when the solution concentration was 3 x 10(-4) mol L(-1), and it decreased dramatically when the concentration kept on increasing because of concentration quenching of the phosphor dye. A red shift for PL spectra and UV-Vis absorption spectra of films compared to those of solutions were found, which is due to the shorter distance, aggregation effect, and stronger interaction of dye molecules in solid state. Based on the spectrum characterization, organic light-emitting diode was fabricated with an ultrathin structure based on this phosphor dye, which showed a high luminescence of 18 367 cd m(-2) at a bias of 13.2 V.
对一种新型黄色磷光染料双[2-(4-叔丁基苯基)苯并噻唑-N,C2']铱(乙酰丙酮)，简称为(t-bt)2Ir(acac)的光致发光(PL)光谱和紫外可见吸收光谱进行了系统研究，这些光谱是在不同浓度的溶液和薄膜状态下测量的。结果表明，当溶液浓度为3×10(-4) mol L(-1)时，PL强度最高，由于磷光染料的浓度猝灭，当浓度继续增加时，PL强度急剧下降。发现薄膜的PL光谱和紫外可见吸收光谱与溶液相比发生了红移，这是由于固态中染料分子的距离较短、聚集效应和更强的相互作用。基于光谱表征，用这种磷光染料制备了具有超薄结构的有机发光二极管，在13.2 V的偏压下显示出18367 cd m(-2)的高发光度。
