Interfacial triplet confinement for achieving efficient solution-processed deep-blue and white electrophosphorescent devices with underestimated poly(N-vinylcarbazole) as the host

Baohua Zhang; Lihui Liu; Guiping Tan; Bing Yao; Cheuk-Lam Ho; Shumeng Wang; Junqiao Ding; Zhiyuan Xie; Wai-Yeung Wong; Lixiang Wang

doi:10.1039/C3TC30912F

Interfacial triplet confinement for achieving efficient solution-processed deep-blue and white electrophosphorescent devices with underestimated poly(N-vinylcarbazole) as the host†

Baohua Zhang,^a Lihui Liu,^ac Guiping Tan,^bd Bing Yao,^a Cheuk-Lam Ho,^b Shumeng Wang,^ac Junqiao Ding,^a Zhiyuan Xie,*^a Wai-Yeung Wong*^b and Lixiang Wang^a

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* Corresponding authors

^a State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
E-mail: xiezy_n@ciac.jl.cn

^b Institute of Molecular Functional Materials, (Areas of Excellence Scheme, University Grants Committee, Hong Kong) and Department of Chemistry and Institute of Advanced Materials, Hong Kong Baptist University, Waterloo Road, Hong Kong, P. R. China
E-mail: rwywong@hkbu.edu.hk

^c University of Chinese Academy of Sciences, Beijing 100039, P. R. China

^d College of Chemistry and Environmental Engineering, Dongguan University of Technology, Dongguan 523808, P. R. China

Abstract

Highly efficient deep-blue and white PhOLEDs with FIr6 as a blue emitter and PVK as a host are developed by using a high triplet level interfacial layer to confine triplet excitons within the emissive layer. Incorporation of an interfacial layer with a higher triplet level such as TPCz can effectively cut off the potential loss pathways of the triplet excitons within the PVK:FIr6 emissive layer. The resultant PVK:FIr6-based deep-blue and white solution-processed PhOLEDs exhibit an unprecedented forward-viewing EQE of 16.1% and a total EQE of 28.0% (38.4 lm W⁻¹) at a practical luminance of 1000 cd m⁻², respectively.

Journal of Materials Chemistry C

Interfacial triplet confinement for achieving efficient solution-processed deep-blue and white electrophosphorescent devices with underestimated poly(N-vinylcarbazole) as the host†

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Interfacial triplet confinement for achieving efficient solution-processed deep-blue and white electrophosphorescent devices with underestimated poly(N-vinylcarbazole) as the host

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