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Zig‐Zag Type Molecular Design Strategy of N‐Type Hosts for Sky‐Blue Thermally‐Activated Delayed Fluorescence Organic Light‐Emitting Diodes
Author(s) -
Yang Chang Yoon,
Lee Kyung Hyung,
Lee Jun Yeob
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904477
Subject(s) - dibenzofuran , oled , materials science , diode , fluorescence , optoelectronics , sky , optics , chemistry , layer (electronics) , physics , nanotechnology , organic chemistry , astrophysics
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.