10 May 2012 Spectrally stable deep blue-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide moiety
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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.
© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE)
Lei Ying, Lei Ying, Yunhua Xu, Yunhua Xu, Na Li, Na Li, Jing'ai Yan, Jing'ai Yan, Yuanyuan Li, Yuanyuan Li, Wei Yang, Wei Yang, Junbiao Peng, Junbiao Peng, } "Spectrally stable deep blue-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide moiety," Journal of Photonics for Energy 2(1), 021212 (10 May 2012). https://doi.org/10.1117/1.JPE.2.021212 . Submission:
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