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Lifetime improvement of organic light-emitting diodes using silicon oxy-nitride as anode modifier

Fu Lung Wong 1Mee Yee Chan 1Shui Lun Lai 1Man Keung Fung 1Ka Ho Lai 1Wai Man Tsang 1Tze Wai Ng 1Chong On Poon Chun Sing Lee 1Shuit Tong Lee 1

1. City university of Hong Kong (CityU), Tat Chee Avenue, Kowloon, Hong Kong, Hong Kong

Abstract

Silicon oxy-nitride (SiOxNy) films prepared by radio-frequency magnetron sputtering were investigated as an anode modifier in organic light-emitting diodes (OLEDs). SiOxNy films were deposited between ITO and the hole transport layer of an OLED with a configuration of indium tin oxide (ITO)/SiOxNy/α-naphtylphenyliphenyl diamine (NPB) /8-hydroxyquinoline aluminum (AlQ)/Mg:Ag. By varying the argon and oxygen flow ratio during deposition of SiOxNy films, devices with improved electroluminescent performance and operation lifetime were obtained. The atomic composition of the SiOxNy films were analyzed by X-ray Photoelectron Microscopy. The best device with the optimal SiOxNy film showed a half brightness lifetime 5 times better than the control device.

 

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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium H, by Fu Lung Wong
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-04 09:41
Revised:   2009-06-07 00:44