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High Power Efficiency Blue‐to‐Green Organic Light‐Emitting Diodes Using Isonicotinonitrile‐Based Fluorescent Emitters
Author(s) -
Sasabe Hisahiro,
Onuma Natsuki,
Nagai Yuji,
Ito Takashi,
Kido Junji
Publication year - 2017
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201601641
Subject(s) - chromaticity , oled , common emitter , quantum efficiency , optoelectronics , phenoxazine , materials science , fluorescence , photoluminescence , diode , electrical efficiency , green light , electroluminescence , optics , power (physics) , blue light , physics , nanotechnology , medicine , layer (electronics) , quantum mechanics , phenothiazine , pharmacology
Herein, 9,10‐dihydro‐9,9‐dimethylacridine (Ac) or phenoxazine (PXZ)‐substituted isonicotinonitrile (INN) derivatives, denoted as 2AcINN , 26AcINN , and 26PXZINN , were developed as a series of thermally activated delayed fluorescence (TADF) emitters. These emitters showed reasonably high photoluminescence quantum yields of 71–79 % in the host films and high power efficiency organic light‐emitting diodes (OLEDs). Sky‐blue emitter 26AcINN exhibited a low turn‐on voltage of 2.9 V, a high external quantum efficiency ( η ext ) of 22 %, and a high power efficiency ( η p ) of 66 lm W −1 with Commission Internationale de l′Eclairage (CIE) chromaticity coordinates of (0.22, 0.45), whereas green emitter 26PXZINN exhibited a low turn‐on voltage of 2.2 V, a high η ext of 22 %, and a high η p of 99 lm W −1 with CIE chromaticity coordinates of (0.37, 0.58). These performances are among the best for TADF OLEDs to date.