A novel anode structure of organic light-emitting diodes was fabricated by inserting a molybdenum trioxide (MoO
3
) layer into the interface of hole injection layer(HIL) 1
4
5
8
9
11-hexaazatriphenylene-hexacarbonitrile (HAT-CN) and hole transport layer 4
4'-bis biphenyl (NPB). The microcavity OLED with a 150 nm-thick Al top cathode and a transparent Al bottom anode on a glass substrate was fabricated. It has the configuration of Glass/Al(15 nm)/HAT-CN(10 nm)/MoO
3
(
x
nm)/NPB(30 nm)/Alq
3
(70 nm)/LiF (1 nm)/Al(150 nm).The current density-voltage-luminance(
J-V-L)
performances shows that this structure is beneficial to the reduction of the driving voltage and the enhancement of the luminance. The highest luminance of the device is reached to 14 390 cd/m
2
at 13 V
with a turn-on voltage of 3.4 V. "Hole only"devices were fabricated to verify the enhancement of hole injection and transport properties of this structure. The optical characteristics of the microcavity
such as narrowed and peak shift
were examined.
关键词
Keywords
references
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