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Journal of Photonics for Energy

Spectrally stable deep blue-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide moiety
Author(s): Lei Ying; Yunhua Xu; Na Li; Jing'ai Yan; Yuanyuan Li; Wei Yang; Junbiao Peng
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Paper Abstract

Efficient deep blue-emitting poly[9,9-bis(2-ethylhexyl)fluorene] derivatives were synthesized via incorporating 2,8-diyl-dibenzothiophene-S,S-dioxide (FSO) moiety into polyfluorene backbone. The photoluminescence (PL) spectra exhibit excellent thermal stability and PL quantum efficiencies distinctly improved upon thermal annealing at various temperatures. Spectrally stable light-emitting diodes were obtained based on resulting copolymers at various driving voltages and operation times. The best device performances were achieved based on copolymer PF-FSO10, which shows a maximum external quantum efficiency of 1.78%, and 2.27% upon thermal annealing in the air, and as high as 3.52% by inserting an additional electron injection layer poly(9,9-bis(6′-(bromilamino)hexyl))fluorene (PFNBr) between the polymer-cathode interface. The stable electroluminescence spectra with CIE coordinates of (0.16, 0.08) and superior device performances indicates that the copolymers could be a promising candidate of deep blue emitters in full-color displays.

Paper Details

Date Published: 10 May 2012
PDF: 11 pages
J. Photon. Energy. 2(1) 021212 doi: 10.1117/1.JPE.2.021212
Published in: Journal of Photonics for Energy Volume 2, Issue 1
Show Author Affiliations
Lei Ying, South China Univ. of Technology (China)
Yunhua Xu, South China Univ. of Technology (China)
Na Li, South China Univ. of Technology (China)
Jing'ai Yan, South China Univ. of Technology (China)
Yuanyuan Li, South China Univ. of Technology (China)
Wei Yang, South China Univ. of Technology (China)
Junbiao Peng, South China Univ. of Technology (China)


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