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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51350

Title: Cyanopyrimidine−Carbazole Hybrid Host Materials for HighEfficiency and Low-Efficiency Roll-Off TADF OLEDs
Authors: Shu-Wei Li
Cheng-Hung Yu
Chang-Lun Ko
Tanmay Chatterjee
Wen-Yi Hung
Ken-Tsung Wong
Contributors: 國立臺灣海洋大學:光電與材料科技學士學位學程(學系)
Date: 2018-03
Issue Date: 2018-11-23T06:10:31Z
Publisher: ACS Appl. Mater. Interfaces
Abstract: Abstract: stract ImageTwo isomeric host materials (Sy and Asy) comprising carbazole (donor) and CN-substituted pyrimidine (acceptor) were synthesized, characterized, and utilized as host materials for green and blue thermally activated delayed fluorescence (TADF) organic light emitting diodes (OLEDs). Both molecules have high triplet energy and small energy difference between singlet and triplet states, leading to feasible TADF. The different linking topologies of carbazole and CN groups on the pyrimidine core provide distinct photophysical properties and molecular packing manners, which further influence the efficiency as they served as hosts in TADF OLEDs. As compared to Asy-based cases, the Sy-hosted TADF OLED device gave higher maximum external quantum efficiencies (EQE) of 24.0% (vs 22.5%) for green (4CzIPN as a dopant) and 20.4% (vs 15.0%) for blue (2CzTPN as a dopant) and low efficiency roll-off. The high horizontal dipole ratio (Θ ≈ 88%) for both emitters dispersed in Sy and Asy hosts accounts for the high device efficiency. A clear molecular structure–physical property–device performance relationship has been established to highlight the importance of symmetrical structure in TADF host material design.
Relation: 10 (15) pp.12930–12936
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51350
Appears in Collections:[光電科學研究所] 期刊論文

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