1 research outputs found
Polyphenylbenzene as a Platform for Deep-Blue OLEDs: Aggregation Enhanced Emission and High External Quantum Efficiency of 3.98%
Great efforts have been devoted to
seek novel approaches for the
construction of efficient deep-blue fluorescent materials, one of
the most important prerequisites for the commercialization of OLEDs.
Here, we report a new way to utilize polyphenylbenzene as a platform
to yield a series of efficient deep-blue emitters. Nondoped multilayer
electroluminescence (EL) devices using these new luminogens as emitting
layers are fabricated. Maximum current efficiency (CE) of 2.0 cd A<sup>ā1</sup> is achieved and the Commission Internationale de
lāEĢclairage (CIE) coordinates can stay at (0.15, 0.08),
close to the saturated deep-blue (0.14, 0.08). Through rational design
of the device structure, blue-violet emission with the CIE coordinates
of (0.15, 0.06) can be realized. Furthermore, <b>10</b>-based
doped devices show deep-blue emission with improved CE as high as
4.51 cd A<sup>ā1</sup>, and the external quantum efficiency
(EQE) of 3.98%, which are among the best EL performance for deep-blue
emission