Study of Configuration Differentia and Highly Efficient, Deep-Blue, Organic Light-Emitting Diodes Based on Novel Naphtho[1,2-<i>d</i>]imidazole Derivatives
作者:Ming Liu、Xiang-Long Li、Dong Cheng Chen、Zhongzhi Xie、Xinyi Cai、Gaozhan Xie、Kunkun Liu、Jianxin Tang、Shi-Jian Su、Yong Cao
DOI:10.1002/adfm.201502163
日期:2015.8
Two novel naphtho[1,2‐d]imidazole derivatives are developed as deep‐blue, light‐emitting materials for organic light‐emitting diodes (OLEDs). The 1H‐naphtho[1,2‐d]imidazole based compounds exhibit a significantly superior performance than the 3H‐naphtho[1,2‐d]imidazole analogues in the single‐layer devices. This is because they have a much higher capacity for direct electron‐injection from the cathode
已开发出两种新型的萘并[1,2- d ]咪唑衍生物作为有机发光二极管(OLED)的深蓝色发光材料。基于1 H萘[1,2- d ]咪唑的化合物表现出明显优于3 H的性能单层装置中的萘[1,2-d]咪唑类似物。这是因为与同分异构体相比,它们具有更高的直接从阴极注入电子的能力,从而产生了4.37%的突破性EQE(外部量子效率)和2.7 V的低启动电压,并且迄今为止,它是非掺杂单层荧光OLED的最佳性能。既由空穴传输层又由电子传输层组成的多层器件,其EQE值为4.12–6.08%,并且发出深蓝光,表现出同样出色的性能(国际照明委员会(CIE)y由于改善了载流子注入并限制了发射层内的电荷,两种异构体均获得了0.077-0.115的最大值)。此外,与基于苯并咪唑或菲咯啉[9,10- d ]咪唑片段的类似分子相比,它们显示出明显更高的蓝色纯度。