Cyclometalated Iridium(III) Carbene Phosphors for Highly Efficient Blue Organic Light-Emitting Diodes

Zhao Chen; Liqi Wang; Sikai Su; Xingyu Zheng; Nianyong Zhu; Cheuk-Lam Ho; Shuming Chen; Wai-Yeung Wong

doi:10.1021/acsami.7b09172

Cyclometalated Iridium(III) Carbene Phosphors for Highly Efficient Blue Organic Light-Emitting Diodes

ACS Appl Mater Interfaces. 2017 Nov 22;9(46):40497-40502. doi: 10.1021/acsami.7b09172. Epub 2017 Nov 10.

Authors

Zhao Chen¹, Liqi Wang¹, Sikai Su², Xingyu Zheng², Nianyong Zhu¹, Cheuk-Lam Ho^{1

3}, Shuming Chen², Wai-Yeung Wong^{1

3}

Affiliations

¹ Institute of Molecular Functional Materials and Department of Chemistry, Hong Kong Baptist University , Waterloo Road, Kowloon Tong, Hong Kong P.R. China ; HKBU Institute of Research and Continuing Education, Shenzhen Virtual University Park, Shenzhen, 518057, P.R. China.
² Department of Electrical and Electronic Engineering, Southern University of Science and Technology , Shenzhen, 518055, P.R. China.
³ Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University , Hong Hom, Hong Kong P.R. China.

PMID: 29090895
DOI: 10.1021/acsami.7b09172

Abstract

Five deep blue carbene-based iridium(III) phosphors were synthesized and characterized. Interestingly, one of them can be fabricated into deep blue, sky blue and white organic light-emitting diodes (OLEDs) through changing the host materials and exciton blocking layers. These deep and sky blue devices exhibit Commission Internationale de l'Éclairage (CIE) coordinates of (0.145, 0.186) and (0.152, 0.277) with external quantum efficiency (EQE) of 15.2% and 9.6%, respectively. The EQE of the deep blue device can be further improved up to 19.0% by choosing a host with suitable energy level of its lowest unoccupied molecular orbital (LUMO).

Keywords: blue phosphor; carbene; iridium; organic light-emitting diode; single-doped OLED.