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

Zhao Chen, Liqi Wang, Sikai Su, Xingyu Zheng, Nianyong Zhu, Cheuk Lam Ho^*, Shuming Chen^*, Wai Yeung Wong^*

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

85 Citations (Scopus)

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).

Original language	English
Pages (from-to)	40497-40502
Number of pages	6
Journal	ACS Applied Materials and Interfaces
Volume	9
Issue number	46
Early online date	10 Nov 2017
DOIs	https://doi.org/10.1021/acsami.7b09172
Publication status	Published - 22 Nov 2017

Scopus Subject Areas

Materials Science(all)

User-Defined Keywords

blue phosphor
carbene
iridium
organic light-emitting diode
single-doped OLED

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10.1021/acsami.7b09172

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

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′{\'e}clairage (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",

author = "Zhao Chen and Liqi Wang and Sikai Su and Xingyu Zheng and Nianyong Zhu and Ho, {Cheuk Lam} and Shuming Chen and Wong, {Wai Yeung}",

note = "Funding Information: W.-Y.W. thanks the Hong Kong Research Grants Council (HKBU 12304715), Areas of Excellence Scheme of the University Grants Committee HKSAR (AoE/P-03/08) and the Hong Kong Polytechnic University (1-ZE1C) for financial support. C.-L.H. thanks the Hong Kong Research Grants Council (HKBU 12317216), National Natural Science Foundation of China (21504074), Hong Kong Baptist University (FRG2/15-16/074) and the Science, Technology and Innovation Committee of Shenzhen Municipality (JCYJ20160531193836532) for their financial support. We also thank the Inter-institutional Collaborative Research Scheme from Hong Kong Baptist University (RC-ICRS/14-15/02) for financial support.",

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AU - Chen, Zhao

AU - Wang, Liqi

AU - Su, Sikai

AU - Zheng, Xingyu

AU - Zhu, Nianyong

AU - Ho, Cheuk Lam

AU - Chen, Shuming

AU - Wong, Wai Yeung

N1 - Funding Information: W.-Y.W. thanks the Hong Kong Research Grants Council (HKBU 12304715), Areas of Excellence Scheme of the University Grants Committee HKSAR (AoE/P-03/08) and the Hong Kong Polytechnic University (1-ZE1C) for financial support. C.-L.H. thanks the Hong Kong Research Grants Council (HKBU 12317216), National Natural Science Foundation of China (21504074), Hong Kong Baptist University (FRG2/15-16/074) and the Science, Technology and Innovation Committee of Shenzhen Municipality (JCYJ20160531193836532) for their financial support. We also thank the Inter-institutional Collaborative Research Scheme from Hong Kong Baptist University (RC-ICRS/14-15/02) for financial support.

PY - 2017/11/22

Y1 - 2017/11/22

N2 - 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).

AB - 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).

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

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