Highly Efficient Orange and Warm White Phosphorescent OLEDs Based on a Host Material with a Carbazole-Fluorenyl Hybrid
作者:Xiaoyang Du、Yun Huang、Silu Tao、Xiaoxia Yang、Chuan Wu、Huaixin Wei、Mei-Yee Chan、Vivian Wing-Wah Yam、Chun-Sing Lee
DOI:10.1002/asia.201400129
日期:2014.6
420 nm. In addition to the application as a blue emitter, NFBC is demonstrated to be a good host for phosphorescent dopants. By doping Ir(2‐phq)3 in NFBC, a highly efficient orange organic light‐emitting diode (OLED) with a maximum efficiency of 32 cd A−1 (26.5 Lm W−1) was obtained. Unlike most phosphorescent OLEDs, the device prepared in our study shows little efficiency roll‐off at high brightness and
一种新的咔唑-芴杂化物3,3'(2,7-二(萘-2-基)-9H-芴-9,9-二基)双(9-苯基-9H-咔唑)(NFBC)为合成和表征。该化合物在溶液和薄膜中均显示蓝紫色发射,峰中心位于404和420 nm。除了用作蓝光发射器之外,还证明了NFBC是磷光掺杂剂的良好基质。通过在NFBC中掺杂Ir(2-phq)3,可获得最大效率为32 cd A -1(26.5 Lm W -1)的高效橙色有机发光二极管(OLED)。与大多数磷光OLED不同,我们研究中制备的器件在高亮度下几乎没有效率下降,并且保持了31.9和26.8 cd A -1的电流效率分别在1000和10000 cd m -2的亮度下。通过同时使用NFBC作为蓝色荧光发射体和磷光掺杂剂的主体,还获得了最大效率为22.9 Lm W -1(21.9 cd A -1)的暖白色OLED 。