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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47106

Title: Remote Steric Effect as a Facile Strategy for Improving the Efficiency of Exciplex-Based OLEDs
Authors: Ken-Tsung Wong
Wen-Yi Hung
Ting-Chih Wang
Pin-Yi Chiang
Bo-Ji Peng
Contributors: 國立臺灣海洋大學:光電科學研究所
Keywords: thermally activated delayed fluorescence (TADF)
bulky substitution
exciplex
intermolecular charge transfer
remote steric effect
Date: 2017-02
Issue Date: 2018-07-03
Publisher: ACS Applied Materials & Interfaces
Abstract: Abstract: This work reports a new strategy of introducing remote steric effect onto the electron donor for giving the better performance of the exciplex-based organic light-emitting device (OLED). The bulky triphenylsilyl group (SiPh3) was introduced onto the fluorene bridge of 4,4′-(9H-fluorene-9,9-diyl)bis(N,N-di-p-tolylaniline) (DTAF) to create remote steric interactions for increasing the possibility of effective contacts between electron-donating chromophores and acceptor molecules, rendering the resulting exciplex to have a higher photoluminescence quantum yield (PLQY). The green exciplex device based on DSDTAF:3N-T2T (1:1) as an emitting layer exhibits a low turn-on voltage of 2.0 V, high maximum efficiencies (13.2%, 42.9 cd A–1, 45.5 lm W–1), which are higher than the device employed DTAF (without SiPh3 groups) (11.6%, 35.3 cd A–1, 41.3 lm W–1) as donor under the same device structure. This strategy was further examined for blue exciplex, where the EQE was enhanced from 9.5% to 12.5% as the electron acceptor PO-T2T mixed with a tert-butyl group substituted carbazole-based donor (CPTBF) as the emitting exciplex in device. This strategy is simple and useful for developing high performance exciplex OLEDs.
Relation: 9 (8) pp.7355–7361
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47106
Appears in Collections:[光電科學研究所] 期刊論文

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