The multifunctional materials for application in organic
light-emitting
devices (OLEDs) based on a single structural motif are very desired
but quite rare species. Such structures allow simplifying the chemical
variety within OLED heterostructures and thus reducing their cost,
manufacturing time, and logistic efforts. In this paper, we report
the 9-(2,3,5,6-tetrafluoro-4-vinylphenyl)carbazole molecule (Cz4FS)
utilized as a fluorescent emitter, host material for quantum dot based
OLEDs (QLEDs), acceptor part of the exciplex active layer, and monomer
that can be used for the preparation of emissive polymers and copolymers.
The external quantum efficiency (EQE) of the corresponding fluorescent
OLED based on a Cz4FS single emitter doped into a 1,3-bis(carbazol-9-yl)benzene
matrix is 4.2%, which is close to the theoretical limit and maximum
brightness at the level of 3600 cd/m2. An OLED based on
exciplex emission obtained utilizing Cz4FS as an acceptor demonstrates
higher efficiency (5.3%) and much higher brightness near 25 000
cd/m2. A QLED based on Cz4FS as a host for CdSeS/ZnS core–shell
quantum dots demonstrates excellent energy transfer from the Cz4FS
matrix that results in a clear spectrum of quantum dots with an EQE
of 2.3%, maximum of 19 000 cd/m2, and narrow spectral
distribution. An OLED based on a Cz4FS-based polymer and copolymer
demonstrates not extraordinary efficiency but low-efficiency roll-off
in a wide range of current densities.
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