10 May 2012 Spectrally stable deep blue-emitting polyfluorenes containing dibenzothiophene-S,S-dioxide moiety
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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, Yunhua Xu, Na Li, Jing'ai Yan, Yuanyuan Li, Wei Yang, 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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