Donor-acceptor-donor Type Narrow-band-gap Dyes Doped Polyfluorene Light Emitting Diodes

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (10): 2098.

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Donor-acceptor-donor Type Narrow-band-gap Dyes Doped Polyfluorene Light Emitting Diodes

SUN Ming-Liang1,2, FAN Su-Qin1, YANG Ren-Qiang1, CAO Yong1*

1. Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Special Functional Materials, Ministry of Education, South China University of Technology, Guangzhou 510640, China;
2. Institute of Material Science and Engineering, Ocean University of China, Qingdao 266100, China

Received:2009-12-24 Online:2010-10-10 Published:2010-10-10
Contact: CAO Yong. E-mail: yongcao@scut.edu.cn
Supported by:
国家“九七三”计划项目(批准号: 2009CB623600)、国家自然科学基金(批准号: 50903078, 50990065)、山东省中青年科学家奖励基金(批准号: BS2009CL036)和教育部博士点新教师基金(批准号: 20090132120017)资助.

Abstract

Abstract: A series of donor-acceptor-donor(DAD) type narrow-band-gap fluorescent organic dyes were used as dopants for polymer light emitting diodes. The solutions of the organic molecules show absorbance peaks between 447 and 472 nm. The optical band gap decreases in the order: O-S and S-S>N-S>Se-S>N-Se. The PL emission peak is around 563—637 nm depending on chemical structure. Energy transfer from polyfluorene to fluorescent organic dyes was observed for both photoluminescence and electroluminescence(EL) of the fluorescent dyes and polyfluorene composite film. The EL peak red shifted in the order are O-S, S-S, N-S, Se-S and N-Se, which agree with the optical band gap. The highest external quantum efficiency achieved with the device configuration ITO/PEDOT/PVK/PFO+N-Se/Ba/Al is 1.28% with luminous efficiency 1.31 cd/A peaked at 633 nm.

Key words: Donor-acceptor-donor, Narrow-band-gap, Dopant, Light emitting diodes

TrendMD:

SUN Ming-Liang, FAN Su-Qin, YANG Ren-Qiang, CAO Yong*. Donor-acceptor-donor Type Narrow-band-gap Dyes Doped Polyfluorene Light Emitting Diodes[J]. Chem. J. Chinese Universities, 2010, 31(10): 2098.

References

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Donor-acceptor-donor Type Narrow-band-gap Dyes Doped Polyfluorene Light Emitting Diodes

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