Yang Chang Yoon, Lee Kyung Hyung, Lee Jun Yeob
School of Chemical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Seobu-ro, Suwon, Gyeonggi, 16419, Korea.
Chemistry. 2020 Feb 21;26(11):2429-2435. doi: 10.1002/chem.201904477. Epub 2020 Feb 6.
N-type hosts for long lifetime in sky-blue thermally-activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) were investigated by synthesizing four hosts with zig-zag-type backbone structure for high triplet energy. The four hosts had two CN units at different positions of the zig-zag-type backbone structure and two dibenzofuran units through either the 2 or 4-position of dibenzofuran. The position of the CN unit was controlled at the meta and para-positions in the zig-zag-type backbone to study the relationship between material parameters and lifetime of the TADF OLEDs. It was revealed that the meta-orientation of the CN units in the backbone was advantageous to extend device lifetime of the sky-blue TADF OLEDs.
通过合成四种具有锯齿形主链结构以获得高三重态能量的主体，对用于天蓝色热激活延迟荧光（TADF）有机发光二极管（OLED）中具有长寿命的N型主体进行了研究。这四种主体在锯齿形主链结构的不同位置具有两个氰基（CN）单元，并通过二苯并呋喃的2位或4位连接两个二苯并呋喃单元。在锯齿形主链的间位和对位控制CN单元的位置，以研究材料参数与TADF OLED寿命之间的关系。结果表明，主链中CN单元的间位取向有利于延长天蓝色TADF OLED的器件寿命。
