High-Triplet-Energy Dendrons: Enhancing the Luminescence of Deep Blue Phosphorescent Iridium(III) Complexes
作者:Shih-Chun Lo、Ruth E. Harding、Christopher P. Shipley、Stuart G. Stevenson、Paul L. Burn、Ifor D. W. Samuel
DOI:10.1021/ja903157e
日期:2009.11.25
coordinates of (0.16, 0.16). The results demonstrate that dendronization of simple chromophores can enhance their properties. Single layer neat dendrimer organic light-emitting diodes (OLEDs) had an external quantum efficiency (EQE) of 0.4% at 100 cd/m(2). Bilayer devices with an electron transport layer gave improved EQEs of up to 3.9%. Time-resolved luminescence measurements suggest that quenching of triplets
具有高发光效率的可溶液加工的蓝色磷光发光体非常适合大面积显示器和照明应用。该报告表明,当 fac-tris[1-methyl-5-(4-fluorophenyl)-3-n-propyl-1H-[1,2,4]triazolyl]iridium(III) 复合核被刚性高-三重态能量树突,物理和光物理特性都可以优化。高三重态和刚性树枝由扭曲的联苯树枝组成,扭曲是由于使用四取代的支化苯环而引起的。蓝色磷光树枝状聚合物是使用会聚方法合成的,并且被发现是可溶液加工的,并且具有 148 摄氏度的高玻璃化转变温度。 该树枝状聚合物具有 94% 的超高溶液光致发光量子产率 (PLQY),是简单母核复合体 (27%) 的三倍多。还发现刚性和高三线态能量树突控制导致固态发光猝灭的分子间相互作用,并且发现薄膜 PLQY 为 60%,其发射具有 Commission Internationale de l'Eclairage