Presentation	2004/11/5 Low frequency noise propertiers of low molecular organic LEDs Yuichi AKIYAMA, Kumi OKANOUE, Hiroki ISHIDA, Katsuyoshi Hamasaki,
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Abstract(in English)	In organic EL element, the secular change of the luminescence property is one of important problems. One ppossible origin of the degradation is poor wettability of the interface of luminous layer and ITO electrode. In this report, we prepared EL devices with and without CuPc buffer layer, and discussed low frequency noise propertiers. The measured noise voltage power spectral density S_v (f) had a Lorentzian frequency dependence as expected from the Machlup model for random telegraph noise. The observed Lorentzian spectra was well explained by this model using characteristic time τ_. The Lorentzian bump frequency shifted to higher frequency with increasing the bias voltage V_B. Both V_B and T dependences of τ_ were analysed by thermal activation model. The estimated activation energy E_α of the EL with CuPc buffer layer was smaller than that of the device without buffer layer.
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Keyword(in English)	Organic LEDs / CuPc buffer layer / Low frequency noise / Thermal activation model
Paper #	CPM2004-141
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Committee	CPM
Conference Date	2004/11/5(1days)
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Registration To	Component Parts and Materials (CPM)
Language	JPN
Title (in Japanese)	(See Japanese page)
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Title (in English)	Low frequency noise propertiers of low molecular organic LEDs
Sub Title (in English)
Keyword(1)	Organic LEDs
Keyword(2)	CuPc buffer layer
Keyword(3)	Low frequency noise
Keyword(4)	Thermal activation model
1st Author's Name	Yuichi AKIYAMA
1st Author's Affiliation	Department of Electrical Engineering, Nagaoka University of Technology()
2nd Author's Name	Kumi OKANOUE
2nd Author's Affiliation	Department of Electrical Engineering, Nagaoka University of Technology
3rd Author's Name	Hiroki ISHIDA
3rd Author's Affiliation	Department of Electrical Engineering, Nagaoka University of Technology
4th Author's Name	Katsuyoshi Hamasaki
4th Author's Affiliation	Department of Electrical Engineering, Nagaoka University of Technology
Date	2004/11/5
Paper #	CPM2004-141
Volume (vol)	vol.104
Number (no)	426
Page	pp.pp.-
#Pages	6
Date of Issue