Abstract
We have investigated the fluorescent and hosting properties of a novel
star-shaped material (SSM) containing carbazole/arylamine backbone. Using
SSM as an emitter, we have fabricated a near ultraviolet-emitting electroluminescent
device with a peak emission at
$\lambda
_{\rm peak} =408~{{nm}}$
and achieved a maximum external
quantum efficiency of 2.56%. We have also demonstrated that SSM can be employed
as an effective hosting material of high-efficiency blue organic light-emitting
diode, in which the maximum current and power efficiencies reached 10.37 cd/A
and 8.69 lm/W, respectively. We have also found that the side-band emission
of blue
$p$
-bis(
$p-N$
,
$N$
-diphenyl-amino-styryl) benzene electroluminophore
could be completely suppressed with the aid of SSM being hosting matrix. Hence,
SSM-based blue device has a higher color-purity than 4,4'-bis(9-carbazolyl)biphenyl-based
one, of which the y-value of color coordinates and the full-width half-maximum
decreased from 0.45 to 0.36, and from 62 to 37 nm, respectively.
© 2014 IEEE
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