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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41264

Title: Balance the Carrier Mobility To Achieve High Performance Exciplex OLED Using a Triazine-Based Acceptor
Authors: Wen-Yi Hung
Pin-Yi Chiang
Shih-Wei Lin
Wei-Chieh Tang
Yi-Ting Chen
Shih-Hung Liu
Pi-Tai Chou
Yi-Tzu Hung
Ken-Tsung Wong
Contributors: 國立臺灣海洋大學:光電科學研究所
Keywords: 1,3,5-triazine;balance mobility
electron-transporting material
exciplex
thermally activated delayed fluorescence (TADF)
Date: 2016
Issue Date: 2017-02-13T03:48:48Z
Publisher: ACS Applied Material Interfaces
Abstract: Abstract: A star-shaped 1,3,5-triazine/cyano hybrid molecule CN-T2T was designed and synthesized as a new electron acceptor for efficient exciplex-based OLED emitter by mixing with a suitable electron donor (Tris-PCz). The CN-T2T/Tris-PCz exciplex emission shows a high ΦPL of 0.53 and a small ΔET-S = −0.59 kcal/mol, affording intrinsically efficient fluorescence and highly efficient exciton up-conversion. The large energy level offsets between Tris-PCz and CN-T2T and the balanced hole and electron mobility of Tris-PCz and CN-T2T, respectively, ensuring sufficient carrier density accumulated in the interface for efficient generation of exciplex excitons. Employing a facile device structure composed as ITO/4% ReO3:Tris-PCz (60 nm)/Tris-PCz (15 nm)/Tris-PCz:CN-T2T(1:1) (25 nm)/CN-T2T (50 nm)/Liq (0.5 nm)/Al (100 nm), in which the electron–hole capture is efficient without additional carrier injection barrier from donor (or acceptor) molecule and carriers mobilities are balanced in the emitting layer, leads to a highly efficient green exciplex OLED with external quantum efficiency (EQE) of 11.9%. The obtained EQE is 18% higher than that of a comparison device using an exciplex exhibiting a comparable ΦPL (0.50), in which TCTA shows similar energy levels but higher hole mobility as compared with Tris-PCz. Our results clearly indicate the significance of mobility balance in governing the efficiency of exciplex-based OLED. Exploiting the Tris-PCz:CN-T2T exciplex as the host, we further demonstrated highly efficient yellow and red fluorescent OLEDs by doping 1 wt % Rubrene and DCJTB as emitter, achieving high EQE of 6.9 and 9.7%, respectively.
Relation: 8(7)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41264
Appears in Collections:[光電科學研究所] 期刊論文

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