Sensitized Fluorescence Organic Light-Emitting Diodes with Reduced Efficiency Roll-Off

Zhiyi Li; Ruifang Wang; Yangyang Zeng; Xiangyu Dong; Guanhao Liu; Xiaoxiao Hu; Teng Gao; Honglei Gao; Yuanyuan Qin; Xiuxian Gu; Chun-Sing Lee; Jiguang Liu; Pengfei Wang; Ying Wang

doi:10.1055/a-1711-5768

Organic Materials (Dec 2021)

Sensitized Fluorescence Organic Light-Emitting Diodes with Reduced Efficiency Roll-Off

Zhiyi Li,
Ruifang Wang,
Yangyang Zeng,
Xiangyu Dong,
Guanhao Liu,
Xiaoxiao Hu,
Teng Gao,
Honglei Gao,
Yuanyuan Qin,
Xiuxian Gu,
Chun-Sing Lee,
Jiguang Liu,
Pengfei Wang,
Ying Wang

Affiliations

Zhiyi Li: Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU−CAS Joint Laboratory of Functional Materials and Devices, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. of China
Ruifang Wang: Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU−CAS Joint Laboratory of Functional Materials and Devices, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. of China
Yangyang Zeng: School of Materials Design & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, P. R. of China
Xiangyu Dong: Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU−CAS Joint Laboratory of Functional Materials and Devices, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. of China
Guanhao Liu: Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU−CAS Joint Laboratory of Functional Materials and Devices, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. of China
Xiaoxiao Hu: Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU−CAS Joint Laboratory of Functional Materials and Devices, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. of China
Teng Gao: Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU−CAS Joint Laboratory of Functional Materials and Devices, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. of China
Honglei Gao: Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU−CAS Joint Laboratory of Functional Materials and Devices, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. of China
Yuanyuan Qin: Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU−CAS Joint Laboratory of Functional Materials and Devices, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. of China
Xiuxian Gu: Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU−CAS Joint Laboratory of Functional Materials and Devices, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. of China
Chun-Sing Lee: Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, P. R. of China
Jiguang Liu: School of Materials Design & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, P. R. of China
Pengfei Wang: Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU−CAS Joint Laboratory of Functional Materials and Devices, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. of China
Ying Wang: Key Laboratory of Photochemical Conversion and Optoelectronic Materials and CityU−CAS Joint Laboratory of Functional Materials and Devices, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. of China

DOI: https://doi.org/10.1055/a-1711-5768
Journal volume & issue: Vol. 3, no. 04
pp. 488 – 492

Abstract

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Abstract Thermally activated delayed fluorescence (TADF)-sensitized fluorescence is a promising strategy to maintain the advantage of TADF materials and fluorescent materials. Nevertheless, the delayed lifetime of the TADF sensitizer is still relatively long, which causes heavy efficiency roll-off. Here we reported a valid tactic to construct fluorescent devices with low-efficiency roll-off by utilizing the TADF sensitizer with a reduced delayed lifetime. By the construction of the sensitization system, the energy transfer efficiency can reach up to 90%. The high-energy transfer efficiency and the TADFʼs short delayed lifetime result in high sensitization over 95% and the maximum external quantum efficiency of 16.2%. Meanwhile, the TADF-sensitized fluorescent devices exhibit reduced efficiency roll-off with an “onset” current density of 23 mA · cm−2. Our results provide an effective strategy to reduce the efficiency roll-off of the TADF sensitization system.

Published in Organic Materials

ISSN: 2625-1825 (Online)
Publisher: Georg Thieme Verlag
Country of publisher: Germany
LCC subjects: Science: Chemistry
Website: https://doi.org/10.1055/s-00040992

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