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Proceedings Paper

Saturated red light emitting polymers and devices
Author(s): Y. Shao; W. Xu; N. Liu; L. Yin; Q. Hou; Y. Xu; W. Zeng; L. Wang; S. Han; J. Wang; J. Peng; Y. Cao
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Paper Abstract

A series of saturated red emission copolymers, polyfluorene copolymers (PFO-DBT), were synthesized and characterized. The saturated red EL emission from the copolymer peaking at about 677 nm and electroluminescence (EL) efficiency of 1.4% based on simple device structure of ITO/PEDOT/PFO-DBT/Ba/Al, were achieved. The operation mechanism of the device was discussed and it was found that hole carrier injection is the major obstacle for improving EL efficiency and EL stability. To overcome such problem, we utilized MEH-PPV which has low HOMO level blended with the PFO-DBT copolymer to improve EL efficiency to 1.7%. Simultaneously, the EL emission lifetime of the device with PFO-DBT:MEH-PPV (50:50) blended polymer extended to 2000hrs. Monochrome passive red emission displays with the blended polymer were fabricated, and exhibited excellent pictures.

Paper Details

Date Published: 20 November 2007
PDF: 7 pages
Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 68280L (20 November 2007); doi: 10.1117/12.769078
Show Author Affiliations
Y. Shao, South China Univ. of Technology (China)
W. Xu, South China Univ. of Technology (China)
N. Liu, South China Univ. of Technology (China)
L. Yin, South China Univ. of Technology (China)
Q. Hou, South China Univ. of Technology (China)
Y. Xu, South China Univ. of Technology (China)
W. Zeng, South China Univ. of Technology (China)
L. Wang, South China Univ. of Technology (China)
S. Han, South China Univ. of Technology (China)
J. Wang, South China Univ. of Technology (China)
J. Peng, South China Univ. of Technology (China)
Y. Cao, South China Univ. of Technology (China)


Published in SPIE Proceedings Vol. 6828:
Light-Emitting Diode Materials and Devices II
Jian Wang; Changhee Lee; Hezhou Wang, Editor(s)

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