TY - JOUR
T1 - Highly Emissive 9-Borafluorene Derivatives
T2 - Synthesis, Photophysical Properties and Device Fabrication
AU - Chen, Xing
AU - Meng, Guoyun
AU - Liao, Guanming
AU - Rauch, Florian
AU - He, Jiang
AU - Friedrich, Alexandra
AU - Marder, Todd B.
AU - Wang, Nan
AU - Chen, Pangkuan
AU - Wang, Suning
AU - Yin, Xiaodong
N1 - Publisher Copyright:
© 2021 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH
PY - 2021/4/7
Y1 - 2021/4/7
N2 - 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.
AB - 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.
KW - boron heterocycles
KW - density functional calculations
KW - luminescence
KW - organic light-emitting diodes
KW - photophysics
UR - http://www.scopus.com/inward/record.url?scp=85102341094&partnerID=8YFLogxK
U2 - 10.1002/chem.202005185
DO - 10.1002/chem.202005185
M3 - Article
C2 - 33496983
AN - SCOPUS:85102341094
SN - 0947-6539
VL - 27
SP - 6274
EP - 6282
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 20
ER -