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Proceedings Paper

Voltage reduction of triplet-triplet annihilation upconversion organic light-emitting diode (Conference Presentation)
Author(s): Chia-Hsun Chen; Man-Kit Leung; Jiun-Haw Lee; Tien-Lung Chiu; Chi-Feng Lin

Paper Abstract

A emission mode based on triplet-triplet annihilation up conversion (TTAUC) was proposed as follows: when the electrons and holes recombined at the sensitizer layer with a lower energy bandgap, the triplet exciton of sensitizer can transfer the energy to the triplet-triplet annihilation (TTA) emitter and emit a higher energy blue photon. TTAUC-OLEDs had proved to have a higher device efficiency with tris(8-hydroxyquinolinato)aluminum (Alq3) as sensitizer and 9,10-Bis(2-naphthyl)anthraces (ADN) as TTA emitter. In this research, we employed Bis(10-hydroxybenzo[h]quinolinato)beryllium (Bebq2) to replace Alq3 which had a higher electron mobility and resulted in a better electrical properties. It showed a higher current density at constant voltages and the turn-on voltage (at 1 cd/m2) decreased 0.3V compared to Alq3 as sensitizer. Bebq2 as sensitizer achieved a higher efficiency with 3.26% in overall EQE, together with 1.91% and 1.35% in blue and green EQE at J=6.71 mA/cm2 compared to Alq3

Paper Details

Date Published: 9 March 2020
Proc. SPIE 11304, Advances in Display Technologies X, 113040O (9 March 2020); doi: 10.1117/12.2544038
Show Author Affiliations
Chia-Hsun Chen, Graduate Institute of Photonics and Optoelectronics, National Taiwan Univ. (Taiwan)
Man-Kit Leung, National Taiwan Univ. (Taiwan)
Jiun-Haw Lee, Graduate Institute of Photonics and Optoelectronics, National Taiwan Univ. (Taiwan)
Tien-Lung Chiu, Yuan Ze Univ. (Taiwan)
Chi-Feng Lin, National United Univ. (Taiwan)

Published in SPIE Proceedings Vol. 11304:
Advances in Display Technologies X
Jiun-Haw Lee; Qiong-Hua Wang; Tae-Hoon Yoon, Editor(s)

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