Green-emitting Polyfluorenes Containing Hexylthiophen-dibenzothiophene-<italic style="font-style: italic">S</italic>, <italic style="font-style: italic">S</italic>-dioxide Unit with Large Two-photon Absorption Cross Section

Li-Wen Hu; Liang Li; Yong Yang; Ting Guo; Yu-Hao Zhang; Wei Yang; Yong Cao

doi:10.1007/s10118-018-2017-y

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Green-emitting Polyfluorenes Containing Hexylthiophen-dibenzothiophene-S, S-dioxide Unit with Large Two-photon Absorption Cross Section

Articles | Updated：2021-02-18

- Green-emitting Polyfluorenes Containing Hexylthiophen-dibenzothiophene-S, S-dioxide Unit with Large Two-photon Absorption Cross Section
- Chinese Journal of Polymer Science Vol. 36, Issue 4, Pages: 546-554(2018)
- Affiliations：
  
  Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
- Author bio：
  
  E-mail mstguo@scut.edu.cn (T.G.)
  E-mail pswyang@scut.edu.cn (W.Y.)
- Funds：
- DOI：10.1007/s10118-018-2017-y
  CLC：
- Received：28 June 2017，
  
  Accepted：05 August 2017，
  
  Online First：16 November 2017，
  
  Published：05 April 2018
- Accepted：
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Li-Wen Hu, Liang Li, Yong Yang, et al. Green-emitting Polyfluorenes Containing Hexylthiophen-dibenzothiophene-S, S-dioxide Unit with Large Two-photon Absorption Cross Section[J]. Chinese Journal of Polymer Science, 2018, 36(4): 546-554. DOI: 10.1007/s10118-018-2017-y.
DOI：

Li-Wen Hu, Liang Li, Yong Yang, et al. Green-emitting Polyfluorenes Containing Hexylthiophen-dibenzothiophene-S, S-dioxide Unit with Large Two-photon Absorption Cross Section[J]. Chinese Journal of Polymer Science, 2018, 36(4): 546-554. DOI: 10.1007/s10118-018-2017-y. DOI：

摘要

Abstract

Green light-emitting polyfluorenes containing 3

7-bis(4-hexylthiophen-2-yl)dibenzo[

]thiophene 5

5-dioxide (DHTSO) unit were synthesized. All the resulted polymers show high thermal stability with the decomposition temperatures (

) over 420℃ and the glass transition temperatures (

) over 75℃. The polymers exhibit the enhanced highest occupied molecular orbital (HOMO) energy levels and the depressed lowest unoccupied molecular orbital (LUMO) energy levels with the increase of DHTSO unit in polymers. The photoluminescence (PL) spectra of the polymers show positive solvatochromism in solution with the variation of solution polarities

indicating remarkable intramolecular charge transfer (ICT) effect in the polymers containing DHTSO moiety. The fluorescence quantum yields (

) are in the range of 34%-67% for PF-DHTSOs in film. All polymers possess two photon absorption (TPA) properties

and the TPA cross sections (

) are enhanced with increasing DHTSO unit in polymers. The highest

is 2392 GM for PF-DHTSO15 in chloroform solution upon 740 nm excitation. The device of PF-DHTSO15 shows green emission with the Commission Internationale de L'. Eclairage (CIE) coordinates of (0.26

0.59)

and the maximum luminous efficiency (LE

max

) of 10.8 cd·A

-1

with the configuration of ITO/PEDOT:PSS/EL/CsF/Al. These results indicate that introducing DHTSO unit into polyfluorene backbone could be a promising molecular design strategy for TPA and effective green-light emission.

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L. W. Hu , Y. Yang , J. Xu , J. F. Liang , T. Guo , B. Zhang , W. Yang , Y. Cao . Blue light-emitting polymers containing fluorine based benzothiophene- S , S -dioxide derivatives J . Mater. Chem. C , 2016 . 4 ( 6 ): 1305 - 1312 . DOI: 10.1039/C5TC03197D http://doi.org/10.1039/C5TC03197D .

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⁰

Green-emitting Polyfluorenes Containing Hexylthiophen-dibenzothiophene-S, S-dioxide Unit with Large Two-photon Absorption Cross Section

DOI：10.1007/s10118-018-2017-y

摘要

Abstract

关键词

Keywords

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