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

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 be...

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Bibliographic Details
Published inJournal of materials chemistry. C, Materials for optical and electronic devices Vol. 6; no. 30; pp. 8144 - 8151
Main Authors Liu, Xiang-Yang, Tian, Qi-Sheng, Zhao, Danli, Ran, Quan, Liao, Liang-Sheng, Fan, Jian
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 2018
Subjects
Charge transport
Current efficiency
Efficiency
Emitters
Germanium
Organic light emitting diodes
Phosphorescence
Platforms
Power efficiency
Quantum efficiency
Silicon
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Summary: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.
ISSN:2050-7526
2050-7534
DOI:10.1039/C8TC02851F