Abstract
Problem statement: The aim of this research was to study the electrical and optical properties of N, N`-bis(Inaphthyl)-N,N`-diphenyl-1,1`-biphenyl-4,4`-diamine (NPB) organic materials often used as hole transport layer in Organic Light-Emitting Devices (OLED). Approach: The NPB layer was prepared using the thermal evaporation method. From photoluminescence spectra, two peaks at 630 and 480 nm were observed with 55 nm NPB. The electrical conductivity was strongly influenced by the layer thickness. Results: The energy band gap of each NPB layer was successfully presented in the range of 2.4-2.9 eV. Conclusion: This study successfully showed the effect of different thickness of NPB in OLED.
Highlights
Various organic light emitting diode displays have been investigated in recent years
The Indium Tin Oxide (ITO) glasses were immersed in ultrasonic baths with acetone for 10 min
The ITO glasses were rinsed in deionized water for 10 min and blow dry with nitrogen gas
Summary
Various organic light emitting diode displays have been investigated in recent years. Despite their excellent performance, various techniques have been recently reported to further improve their efficiency. The electron-injecting electrode consists of a low work function metal alloy, deposited by vacuum evaporation. Vacuum evaporation is widely to use for preparation OLEDs. OLEDs structure consists of two important layer which is hole tranposrt layer (HTL) and electron transport layer (ETL) connected by two electrodes. Indium Tin Oxide (ITO) as an anode on the bottom, hole-injecting, electrode (Paul et al, 1997). Energy is released as light, which is emitted from the light-transmissive anode and substrate
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