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Issue 30, 2018
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9-Silafluorene and 9-germafluorene: novel platforms for highly efficient red phosphorescent organic light-emitting diodes

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Abstract

Two novel heterofluorene motifs consisting of the group 14 elements Si and Ge were developed as robust molecular platforms for the construction of organic light-emitting diode (OLED) materials. These two compounds exhibited similar photophysical properties, thermal stabilities and electrochemical behaviors except for the charge transport abilities. The red OLED hosted by a 9-silafluorene derivative (DPS) with Ir(MDQ)2(acac) as the emitter exhibited state-of-the-art current efficiency, power efficiency, and external quantum efficiency (EQE) with maxima of 50.7 cd A−1, 44.7 lm W−1, and 28.3%, respectively. In addition, the maximum EQE of a 9-germafluorene derivative (DPG)-based red device could reach 20%. These results indicated the great potential of group 14 element derivatives in the construction of highly efficient OLED materials.

Graphical abstract: 9-Silafluorene and 9-germafluorene: novel platforms for highly efficient red phosphorescent organic light-emitting diodes

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Article information


Submitted
11 Jun 2018
Accepted
10 Jul 2018
First published
12 Jul 2018

J. Mater. Chem. C, 2018,6, 8144-8151
Article type
Paper

9-Silafluorene and 9-germafluorene: novel platforms for highly efficient red phosphorescent organic light-emitting diodes

X. Liu, Q. Tian, D. Zhao, Q. Ran, L. Liao and J. Fan, J. Mater. Chem. C, 2018, 6, 8144
DOI: 10.1039/C8TC02851F

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