Issue 35, 2010
From the journal:

Journal of Materials Chemistry

Metallophosphors of platinum with distinct main-group elements: a versatile approach towards color tuning and white-light emission with superior efficiency/color quality/brightness trade-offs†

Guijiang Zhou,*ab   Qi Wang,c   Xingzhu Wang,d   Cheuk-Lam Ho,b   Wai-Yeung Wong,*b   Dongge Ma,*c   Lixiang Wangc  and  Zhenyang Line  

* Corresponding authors

a MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and Department of Chemistry, Xi'an Jiao Tong University, Xi'an
E-mail: zhougj@mail.xjtu.edu.cn

b Department of Chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong, P.R. China
E-mail: rwywong@hkbu.edu.hk
Fax: +852-3411-7348
Tel: +852-3411-7074

c State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, P.R. China
E-mail: mdg1014@ciac.jl.cn

d College of Chemistry and Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry Education, Xiangtan University, Xiangtan, Hunan Province, P.R. China

e Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Hong Kong, P.R. China

Abstract

A new series of phosphorescent platinum(II) cyclometalated complexes with distinct electronic structures has been developed by simple tailoring of the phenyl ring of ppy (Hppy = 2-phenylpyridine) with various main-group moieties in [Pt(ppy-X)(acac)] (X = B(Mes)2, SiPh3, GePh3, NPh2, POPh2, OPh, SPh, SO2Ph substituted at the para position). Their distinctive electronic characters, resulting in improved hole-injection/hole-transporting or electron-injection/electron-transporting features, have confined/consumed the electrons in the emission layer of organic light-emitting diodes (OLEDs) to achieve good color purity and high efficiency of the devices. The maximum external quantum efficiency of 9.52%, luminance efficiency of 30.00 cd A−1 and power efficiency of 8.36 lm W−1 for the OLEDs with Pt-B (X = B(Mes)2) as the emitter, 8.50%, 29.74 cd A−1 and 19.73 lm W−1 for the device with Pt-N (X = NPh2), 7.92%, 22.06 cd A−1 and 13.64 lm W−1 for the device with Pt-PO (X = POPh2) as well as 8.35%, 19.59 cd A−1 and 7.83 lm W−1 for the device with Pt-SO2 (X = SO2Ph) can be obtained. By taking advantage of the unique electronic structures of the Pt-Ge (X = GePh3) and Pt-O (X = OPh) green emitters and the intrinsic property of blue-emitting hole-transport layer of 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB), single-dopant white OLEDs (WOLEDs) can be developed. These simple WOLEDs emit white light of very high quality (CIE at (0.354, 0.360), CRI of ca. 97 and CCT at 4719 K) even at high brightness (>15000 cd m−2) and the present work represents significant progress to address the bottle-neck problem of WOLEDs for the efficiency/color quality/brightness trade-off optimization that is necessary for pure white light of great commercial value.

Graphical abstract: Metallophosphors of platinum with distinct main-group elements: a versatile approach towards color tuning and white-light emission with superior efficiency/color quality/brightness trade-offs

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Article information

DOI
https://doi.org/10.1039/C0JM01159B
Article type
Paper
Submitted
22 Apr 2010
Accepted
12 Jun 2010
First published
20 Jul 2010

J. Mater. Chem., 2010,20, 7472-7484

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Metallophosphors of platinum with distinct main-group elements: a versatile approach towards color tuning and white-light emission with superior efficiency/color quality/brightness trade-offs

G. Zhou, Q. Wang, X. Wang, C. Ho, W. Wong, D. Ma, L. Wang and Z. Lin, J. Mater. Chem., 2010, 20, 7472 DOI: 10.1039/C0JM01159B

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