Abstract
In general, a guest dopant is doped into a single host matrix for white-light
emission with two complementary colors. In this work, however, we have fabricated
a white organic light-emitting diode (WOLED) based on dual partial dye doping
in which a guest dopant is partially doped into two different host emitters;
namely, orange-red emitting 4-(dicyanomethylene)-2-methyl-6-($p$-dimethylaminostyryl)-$4H$-pyran (DCM) is partially doped into both blue-emitting
4, $4^{\prime}$-bis(2,$2^{\prime}$-diphenylvinyl)-1,$1^{\prime}$-biphenyl (DPVBi) and
green-emitting Tris-(8-hydroxyquinoline) aluminum $({\hbox{Alq}}_{3})$. We demonstrate that dual partial
dye doping allows us to finely tune the Commission Internationale d'Eclairage
(CIE) chromaticity coordinates to the equienergy white point $(x=0.33, y=0.33)$. In addition, it enhances device performance
further, compared to WOLEDs based on DCM partially doped into a single host
matrix (either DPVBi or ${\hbox{Alq}}_{3}$). Moreover, the dual partial doping scheme is shown to provide
a way of suppressing the self-quenching effect (singlet-singlet annihilation).
For a systematic study, we have implemented a comprehensive numerical model
and performed simulations of the OLED structure, providing a clear understanding
with regard to the underlying physics of OLEDs. We also carry out an investigation
of the effects of key design parameters such as the doped layer position and
thickness and dye concentration on the electroluminescence property of WOLEDs.
© 2007 IEEE
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