Abstract
A multilayer charge generation unit (CGU)
${MoO}_{3}/{Al/Cs}_{2}{CO}_{3}$
has been developed for inverted tandem organic light-emitting
diodes (OLEDs). The current efficiency of inverted tandem phosphorescence
OLED with
${MoO}_{3}$
(8 nm)/Al (1 nm)/
${Cs}_{2}{CO}_{3}$
(0.5 nm)
CGU is almost twice as high as that of individual electroluminescent
(EL) device. Charges generate at hole-transporting host material/
${MoO}_{3}$
interface and
${MoO}_{3}$
bulk layer, and electrons
are extracted by
${Cs}_{2}{CO}_{3}$
/electon-transporting layer (ETL) interface. The significantly
enhanced performance of the tandem device with
${MoO}_{3}/{Al/Cs}_{2}{CO}_{3}$
CGU compared with a
${MoO}_{3}/{Cs}_{2}{CO}_{3}$
-based one may be attributed to preventing chemical reaction
of
${MoO}_{3}$
and
${Cs}_{2}{CO}_{3}$
by the inserted ultrathin Al layer. Moreover, the current
efficiency and EL spectrum of another inverted tandem OLED combining
red and green stack further prove the effective charge generation
and separation with the multilayer
${MoO}_{3}/{Al/Cs}_{2}{CO}_{3}$
CGU. It is expected that such a CGU is a promising candidate
for inverted tandem white OLED for active matrix organic light-emitting
diode display driven by an n-type thin-film transistor backplane.
© 2015 IEEE
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