Technology development of ITO surface modification and MoO3/Al/MoO3 films as the electrode by thermal deposition method for OLEDs applications

Abstract

In this thesis we focused on how to fabricate a ITO-free organic light-emitting diodes MoO3/Al/MoO3 as semitransparent anode by thermal deposition and the investigation the performance of organic light-emitting devices with ITO substrate was modified by caesium fluoride solution and follow by UV-ozone treatment In the first part of this search fabricate a ITO-free organic light-emitting diodes MoO3/Al/MoO3 as semitransparent anode by thermal deposition At the second part the investigation the performance of organic light-emitting devices with ITO substrate was modified by caesium fluoride solution and follow by UV-ozone Furthermore the admittance spectroscopy proved useful in interface modification because of anode buffer layer In the last part we discussed the applications of OLED device In this study the ITO substrates was modified by CsF solution the work function and the surface roughness decreases with small concentrations of CsF solution As the result the device with ITO modified have a better performance (ITO / NPB (40nm) / Alq3 (60nm) / LiF (1nm) / Al (150nm)) the driving voltage of the device was 3V the luminance can be reached to 20300 cd/m2 and the efficiency was 2 94 cd/A In addition ITO-free organic light-emitting diodes MoO3/Al/MoO3 as semitransparent anode fabricated by thermal deposition the EL spectrum of the device has been demonstrated because of micro-cavity effect The configurations of the proposed devices were glass / MoO3(30nm) / Al (15nm) / MoO3 (5nm) / (NPB) (40 nm)/ Alq3 (60 nm)/ LiF (1 nm)/ Al (150 nm) had a better performance the luminance can be reached to 21800 cd/m2 and the efficiency was 3 14 cd/A

Date of Award	2014 Jul 31
Original language	English
Supervisor	Sheng-Yuan Chu (Supervisor)