Voltage reduction of triplet-triplet annihilation upconversion organic light-emitting diode (Conference Presentation)

Chia-Hsun Chen; Man-Kit Leung; Jiun-Haw Lee; Tien-Lung Chiu; Chi-Feng Lin

doi:10.1117/12.2544038

9 March 2020 Voltage reduction of triplet-triplet annihilation upconversion organic light-emitting diode (Conference Presentation)

Chia-Hsun Chen, Man-Kit Leung, Jiun-Haw Lee, Tien-Lung Chiu, Chi-Feng Lin

Author Affiliations +

Proceedings Volume 11304, Advances in Display Technologies X; 113040O (2020) https://doi.org/10.1117/12.2544038
Event: SPIE OPTO, 2020, San Francisco, California, United States

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

Conference Presentation

Citation Download Citation

Chia-Hsun Chen, Man-Kit Leung, Jiun-Haw Lee, Tien-Lung Chiu, and Chi-Feng Lin "Voltage reduction of triplet-triplet annihilation upconversion organic light-emitting diode (Conference Presentation)", Proc. SPIE 11304, Advances in Display Technologies X, 113040O (9 March 2020); https://doi.org/10.1117/12.2544038

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KEYWORDS

Organic light emitting diodes

Upconversion

Electrons

External quantum efficiency

Excitons

Internal quantum efficiency

Luminescence

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