Bipolar Blue Light-emitting Polyfluorenes Containing Dibenzothiophene-S,S-dioxide/Carbazole Units

doi:10.1007/s40242-018-7311-2

Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (3): 506-512.doi: 10.1007/s40242-018-7311-2

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Bipolar Blue Light-emitting Polyfluorenes Containing Dibenzothiophene-S,S-dioxide/Carbazole Units

LIANG Li, LIU Jie, ZHANG Yuhao, HU Liwen, GUO Ting, YANG Wei, CAO Yong

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

Received:2017-09-20 Revised:2018-02-09 Online:2018-06-01 Published:2018-03-26
Contact: 10.1007/s40242-018-7311-2 E-mail:mstguo@scut.edu.cn;pswyang@scut.edu.cn
Supported by:
Supported by the National Key Basic Research and Development Program of China(No.2015CB655004), the National Natural Science Foundation of China(Nos.51473054, 21704027), the Science and Technology Planning Project of Guangdong Province, China(No.2017A050503002) and the Fundamental Research Funds for the Centural Universities(SCUT), China(No. 2017MS020).

Abstract

Abstract: Bipolar blue light-emitting polyfluorenes(PFSO-Cz) containing electron-deficient dibenzothiophene-S,S-dioxide(SO) and electron-rich carbazole(Cz) unit were synthesized. All the polymers show a high thermal stability with the decomposition temperatures over 400℃ and higher photoluminescence quantum yields. The highest occupied molecular orbital energy levels(E_HOMO's) slightly enhance and the lowest unoccupied molecular orbital energy levels(E_LUMO's) gently depress with the increase of Cz content in the polymers. PL spectra of the polymers display remarkable red shift and broadening with the increase of solvent polarities, indicating significant intramolecular charge transfer(ICT) effect in the polymers. Electroluminescence(EL) spectra of the polymers exhibit a broadening tendency with increasing the content of Cz unit in the polymers. The superior device performances were obtained with the maximum luminous efficiency(LE_max) of 5.2 cd/A, the maximum external quantum efficiency(EQE_max) of 4.8% and the Internationale de l'Eclairage(CIE)(x,y) coordinates of (0.16, 0.17) for PFSO15-Cz10 based on the single-layer device of ITO/PEDOT:PSS/EL/CsF/Al. The results indicate that the efficient bipolar blue light-emitting polyfluorenes are also constructed by Suzuki copolymerization using the monomers in common use.

Key words: Dibenzothiophene-S,S-dioxide, Carbazole, Polyfluorene, Blue emission, Polymer light-emitting diode

LIANG Li, LIU Jie, ZHANG Yuhao, HU Liwen, GUO Ting, YANG Wei, CAO Yong. Bipolar Blue Light-emitting Polyfluorenes Containing Dibenzothiophene-S,S-dioxide/Carbazole Units[J]. Chemical Research in Chinese Universities, 2018, 34(3): 506-512.

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Bipolar Blue Light-emitting Polyfluorenes Containing Dibenzothiophene-S,S-dioxide/Carbazole Units

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