Issue 21, 2018

High-performance yellow- and orange-emitting diodes based on novel sublimable cationic iridium(iii) complexes by ligand control

Abstract

We have devised a series of novel sublimable cationic iridium(III) complexes by ligand control, investigated their photophysical properties, electrochemical behaviours and thermal stabilities, and then fabricated vacuum-evaporated-deposited organic light-emitting diodes. By doping these cationic iridium(III) complexes into a thermally activated delayed fluorescence bipolar host material at very low concentrations of 1 or 2%, we have achieved high-performance yellow- and orange-emitting diodes with peak external quantum efficiencies of 13.7 and 10.3%, respectively. All the devices show maximum luminance exceeding 27.3 × 103 cd m−2 and low turn-voltages varying from 2.2 to 2.5 V. To our knowledge, these values are the record performance of analogous devices based on cationic iridium(III) complexes, indicating their great promise as phosphorescent emitters for flat-panel displays and solid-state lightning techonology.

Graphical abstract: High-performance yellow- and orange-emitting diodes based on novel sublimable cationic iridium(iii) complexes by ligand control

Supplementary files

Article information

Article type
Paper
Submitted
04 Apr 2018
Accepted
01 May 2018
First published
16 May 2018

J. Mater. Chem. C, 2018,6, 5630-5638

High-performance yellow- and orange-emitting diodes based on novel sublimable cationic iridium(III) complexes by ligand control

D. Ma, R. Liu, Y. Qiu and L. Duan, J. Mater. Chem. C, 2018, 6, 5630 DOI: 10.1039/C8TC01566J

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