Special Section on Organic Light-Emitting Materials and Devices

Spectrally stable deep blue-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide moiety

[+] Author Affiliations
Lei Ying, Yunhua Xu, Na Li, Jing’ai Yan, Yuanyuan Li, Wei Yang, Junbiao Peng

South China University of Technology, Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, Guangzhou 510640, China

J. Photon. Energy. 2(1), 021212 (May 10, 2012). doi:10.1117/1.JPE.2.021212
History: Received September 26, 2011; Revised March 8, 2012; Accepted April 4, 2012
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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.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Lei Ying ; Yunhua Xu ; Na Li ; Jing’ai Yan ; Yuanyuan Li, et al.
"Spectrally stable deep blue-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide moiety", J. Photon. Energy. 2(1), 021212 (May 10, 2012). ; http://dx.doi.org/10.1117/1.JPE.2.021212


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