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Indenofluorene- and carbazole-based copolymers for blue PLEDs with simultaneous high efficiency and good color purity

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Abstract

A series of blue-emitting poly(2,8-indenofluorene-co-2,7-carbazole)s, namely P(IF-Cz10), P(IF-Cz25), and P(IF-Cz50), has been designed and synthesized for use in polymer light-emitting diodes (PLEDs). With increasing carbazole content, the resultant copolymers are found to show blue-shifted emission and reduced photoluminescence quantum yields (PLQYs) in films. Consequently, P(IF-Cz25) represents the best trade-off between PLQY and blue light of these materials. The corresponding device reveals a peak external quantum efficiency of 4.12% (3.19 cd A−1, 2.78 lm W−1) and Commission Internationale de L’Eclairage coordinates of (0.150, 0.081). The results clearly indicate that the copolymerization of indenofluorene and carbazole is a promising strategy for developing blue PLEDs with simultaneous high efficiency and good color purity, with a CIEy value of <0.10.

Graphical abstract: Indenofluorene- and carbazole-based copolymers for blue PLEDs with simultaneous high efficiency and good color purity

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Article information


Submitted
10 Aug 2020
Accepted
28 Sep 2020
First published
29 Sep 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Indenofluorene- and carbazole-based copolymers for blue PLEDs with simultaneous high efficiency and good color purity

D. Mei, L. Yang, L. Zhao, S. Wang, H. Tian, J. Ding and L. Wang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC03796F

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