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Cyclometalated Ir(III) Complexes for High-Efficiency Solution-Processable Blue PhOLEDs

Kozhevnikov, Valery N.; Zheng, Yonghao; Clough, Matthew; Al-Attar, Hameed A.; Griffiths, Gareth C.; Abdullah, Khalid; Raisys, Steponas; Jankus, Vygintas; Bryce, Martin R.; Monkman, Andrew P.

Cyclometalated Ir(III) Complexes for High-Efficiency Solution-Processable Blue PhOLEDs Thumbnail


Valery N. Kozhevnikov

Yonghao Zheng

Matthew Clough

Hameed A. Al-Attar

Gareth C. Griffiths

Khalid Abdullah

Steponas Raisys

Vygintas Jankus

Andrew P. Monkman


This article reports the systematic functionalization of FIrpic (1) with solubilizing alkyl groups (complexes 2–4) or mesityl groups (complexes 5 and 6). Complex 5 is shown to offer significant advantages over FIrpic (1) in terms of performance of sky-blue polymer-based phosphorescent organic light-emitting diodes (PhOLEDs) with a solution-processed emitting layer (λmaxEL 477 nm for 5). Devices with 5 doped into poly(vinylcarbazole) (PVK):OXD-7 gave a maximum luminous efficiency of 19.1 cd A–1 at a brightness of 5455 cd m2 with EQE 8.7%. Optimized multilayer devices with additional TPBi and LiF layers gave 23.7 cd A–1 and EQE 10.4%. These data compare favorably with leading literature values for sky-blue polymer-based PhOLEDs. The enhanced performance of 5 is ascribed to three main reasons: (i) reduced concentration quenching of 5; (ii) the higher radiative yield of 5; and (iii) improved solubility of 5 in organic solvents. Complex 5 should find widespread use as a soluble blue phosphor for displays and lighting applications using solution processing techniques.


Kozhevnikov, V. N., Zheng, Y., Clough, M., Al-Attar, H. A., Griffiths, G. C., Abdullah, K., …Monkman, A. P. (2013). Cyclometalated Ir(III) Complexes for High-Efficiency Solution-Processable Blue PhOLEDs. Chemistry of Materials, 25(11), 2352-2358.

Journal Article Type Article
Publication Date Jun 11, 2013
Deposit Date Nov 24, 2014
Publicly Available Date Nov 26, 2014
Journal Chemistry of Materials
Print ISSN 0897-4756
Electronic ISSN 1520-5002
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 25
Issue 11
Pages 2352-2358
Keywords Iridium complex, phosphorescence, Electroluminescence, Blue emission, OLED.


Accepted Journal Article (558 Kb)

Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Chemistry of Materials, copyright © 2013 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see

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