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Highly Emissive 9‐Borafluorene Derivatives: Synthesis, Photophysical Properties and Device Fabrication
Author(s) -
Chen Xing,
Meng Guoyun,
Liao Guanming,
Rauch Florian,
He Jiang,
Friedrich Alexandra,
Marder Todd B.,
Wang Nan,
Chen Pangkuan,
Wang Suning,
Yin Xiaodong
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202005185
Subject(s) - oled , electroluminescence , fabrication , thermal stability , materials science , optoelectronics , diode , photochemistry , luminance , chemistry , nanotechnology , organic chemistry , optics , medicine , alternative medicine , physics , pathology , layer (electronics)
Abstract A series of 9‐borafluorene derivatives, functionalised with electron‐donating groups, have been prepared. Some of these 9‐borafluorene compounds exhibit strong yellowish emission in solution and in the solid state with relatively high quantum yields (up to 73.6 % for FMesB‐Cz as a neat film). The results suggest that the highly twisted donor groups suppress charge transfer, but the intrinsic photophysical properties of the 9‐borafluorene systems remain. The new compounds showed enhanced stability towards the atmosphere, and exhibited excellent thermal stability, revealing their potential for application in materials science. Organic light‐emitting diode (OLED) devices were fabricated with two of the highly emissive compounds, and they exhibited strong yellow‐greenish electroluminescence, with a maximum luminance intensity of >22 000 cd m −2 . These are the first two examples of 9‐borafluorene derivatives being used as light‐emitting materials in OLED devices, and they have enabled us to achieve a balance between maintaining their intrinsic properties while improving their stability.