Efficient Pyrazolo[5,4-f]quinoxaline Functionalized Os(II) Based Emitter with an Electroluminescence Peak Maximum at 811 nm

Ze-Lin Zhu; Sheng-Fu Wang; Li-Wen Fu; Ji-Hua Tan; Chen Cao; Yi Yuan; Shek-Man Yiu; Ye-Xin Zhang; Yun Chi; Chun-Sing Lee

doi:10.1002/chem.202103202

Efficient Pyrazolo[5,4-f]quinoxaline Functionalized Os(II) Based Emitter with an Electroluminescence Peak Maximum at 811 nm

Chemistry. 2022 Jan 19;28(4):e202103202. doi: 10.1002/chem.202103202. Epub 2021 Dec 7.

Authors

Ze-Lin Zhu^{1

2}, Sheng-Fu Wang³, Li-Wen Fu³, Ji-Hua Tan¹, Chen Cao¹, Yi Yuan², Shek-Man Yiu¹, Ye-Xin Zhang⁴, Yun Chi^{1

3

2}, Chun-Sing Lee¹

Affiliations

¹ Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, City University of Hong Kong, Hong Kong SAR, P. R. China.
² Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, P. R. China.
³ Department of Chemistry, Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu, 30013, Taiwan.
⁴ Suzhou Joysun Advanced Materials Co., Ltd., Unit B, Building 12, No. 200, Xingpu Road, Suzhou Industrial Park, Suzhou, 215000, P. R. China.

PMID: 34811829
DOI: 10.1002/chem.202103202

Abstract

Upon fusing the pyrazinyl pyrazole entity in giving pyrazolo[3,4-f]quinoxaline chelate, the corresponding Os(II) based NIR emitter exhibited "invisible" and efficient electroluminescence with a peak maximum at 811 nm. A maximum external quantum efficiency of 0.97 % and a suppressed efficiency roll-off till a current density of 300 mA cm^-2 was also exhibited.

Keywords: 800 nm; near-infrared; organic light-emitting diodes; osmium(II) complex; pyrazolo[5,4-f]quinoxaline.

Abstract

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