廖良生教授课题组及其合作者在Nature Photonics上发表论文

发布时间:2020-07-08访问量:1017设置

题目:

Overcoming The Energy Gap Law in Near-Infrared OLEDs by Exciton–Vibration Decoupling

作者:

Yu-Chen Wei,#,1 Sheng Fu Wang,#,2 Yun Hu,#,3,4 Liang-Sheng Liao ,3,* Deng-Gao Chen ,1 Kai-Hsin Chang,1 Chi-Wei Wang,1 Shih-Hung Liu ,1 Wei-Hsiang Chan ,2 Jia-Ling Liao ,2 Wen-Yi Hung ,5 Tsai-Hui Wang ,6 Po-Ting Chen,6 Hsiu-Fu Hsu,6 Yun Chi 2,4,* and Pi-Tai Chou 1,*

单位:

1Department of Chemistry, National Taiwan University, Taipei, Taiwan.

2Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu, Taiwan.

3Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, China.

4Department of Materials Science and Engineering, Department of Chemistry, and Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong, Hong Kong SAR.

5Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung, Taiwan.

6Department of Chemistry, Tamkang University, New Taipei, Taiwan.

摘要:

The development of high-performance near-infrared organic light-emitting diodes is hindered by strong non-radiative processes as governed by the energy gap law. Here, we show that exciton delocalization, which serves to decouple the exciton band from highly vibrational ladders in the S0 ground state, can bring substantial enhancements in the photoluminescence quantum yield of emitters, bypassing the energy gap law. Experimental proof is provided by the design and synthesis of a series of new Pt(‖) complexes with a delocalization length of 5-9 molecules that emit at 866-960 nm with a photoluminescence quantum yield of 5-12% in solid films. The corresponding near-infrared organic light-emitting diodes emit light with a 930 nm peak wavelength and a high external quantum efficiency up to 2.14% and a radiance of 41.6 W sr-1 m-2 . Both theoretical and experimental results confirm the exciton-vibration decoupling strategy, which should be broadly applicable to other well-aligned molecular solids.

影响因子:

31.241

分区情况:

一区

链接:

https://www.nature.com/articles/s41566-020-0653-6


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