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Solution-processable thermally activated delayed fluorescence white OLEDs based on dual-emission polymers with tunable emission colors and aggregation enhanced emission properties.

Li, Chensen and Nobuyasu, Roberto S. and Wang, Yukun and Dias, Fernando B. and Ren, Zhongjie and Bryce, Martin R. and Yan, Shouke (2017) 'Solution-processable thermally activated delayed fluorescence white OLEDs based on dual-emission polymers with tunable emission colors and aggregation enhanced emission properties.', Advanced optical materials., 5 (20). p. 1700435.

Abstract

Thermally activated delayed fluorescence (TADF) white organic light-emitting diodes (WOLEDs) have drawn tremendous interest and have been extensively studied because of harvesting both triplet and singlet excitons without heavy metals. However, single white-light-emitting polymers are currently limited and few strategies exist to design these materials. Herein, a new strategy is proposed to develop the polymers with tunable emission colors by combining fluorescence and TADF based on aggregation-enhanced emission (AEE) characteristics. The polymers containing different ratios of pendant 2-(10H-phenothiazin-10-yl)dibenzothiophene-S,S-dioxide units with yellow TADF emission and dibenzothiophene units with blue fluorophor emission, which display both TADF and AEE characteristics, are synthesized successfully. Among them, the emission color of P3 in different tetrahydrofuran/water mixtures changes from greenish-blue to white or yellow. Moreover, P3 displays white emission in the solid state dispersing by poly(methyl methacrylate). In addition, electroluminescent device of P3 achieve white light emission with high color rending indexes (CRI) and low turn-on voltages (V on ). P3 OLEDs show two-color warm-white emission with high CRI of 77, low V on of 2.9 V, CEmax of 23.0 cd A−1, PEmax of 32.8 lm W−1, external quantum efficiency (EQE)max of 10.4% with Commission Internationale de l'Eclairage coordinates of (0.37, 0.38) at 5 V. Moreover, EQE of 2.6%, CE of 5.7 cd/A, PE of 4.7 lm W−1 at 100 cd m−2 are obtained. To the best of our knowledge, this work reports the first example of warm-white TADF polymer OLEDs.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1002/adom.201700435
Publisher statement:This is the peer reviewed version of the following article: C. Li, R. S. Nobuyasu, Y. Wang, F. B. Dias, Z. Ren, M. R. Bryce, S. Yan (2017) Solution-Processable Thermally Activated Delayed Fluorescence White OLEDs Based on Dual-Emission Polymers with Tunable Emission Colors and Aggregation-Enhanced Emission Properties, Advanced Optical Materials, 5(20): 1700435, which has been published in final form at https://doi.org/10.1002/adom.201700435. This article may be used for non-commercial purposes in accordance With Wiley-VCH Terms and Conditions for self-archiving.
Date accepted:04 July 2017
Date deposited:06 July 2017
Date of first online publication:21 August 2017
Date first made open access:21 August 2018

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