Conduction and degradation analysis of organic LEDs by current noise monitoring

Giorgio Ferrari; Dario Natali; Marco Sampietro; Franz P. Wenzl; Ullrich Scherf; Christopher Schmitt; R. Guentner; Guenther Leising

doi:10.1117/12.457470

27 February 2002 Conduction and degradation analysis of organic LEDs by current noise monitoring

Giorgio Ferrari, Dario Natali, Marco Sampietro, Franz P. Wenzl, Ullrich Scherf, Christopher Schmitt, R. Guentner, Guenther Leising

Author Affiliations +

Proceedings Volume 4464, Organic Light-Emitting Materials and Devices V; (2002) https://doi.org/10.1117/12.457470
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

The paper describes the use of noise current analysis to sense variations of the microscopic conduction process in organic Light Emitting Diodes and to track their evolution through time. The monitoring of current fluctuations has been made both in time and frequency domain and is of great value when one wants to correlate the conduction properties of the charge carriers and the changes in current flow with the corresponding changes in the microscopic morphology of the organic layers. The method reveals itself to be very effective also in sensing the initial state and the growth of catastrophic degradation of oLEDs in large advance with respect to current monitoring or other techniques. Microscopic damages within the device, as a result of microshorts and/or thermal breakdown, are shown to reveal a neat increase of the white noise component of about three orders of magnitude in the power spectral density, that can therefore be detected with very good time precision. This would allow to study the sources that may give reason of degradation, through structural or spectroscopic investigations for example, before the microscopic damages have sum up to a visible and irreversible macroscopic failure.

Citation Download Citation

Giorgio Ferrari, Dario Natali, Marco Sampietro, Franz P. Wenzl, Ullrich Scherf, Christopher Schmitt, R. Guentner, and Guenther Leising "Conduction and degradation analysis of organic LEDs by current noise monitoring", Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); https://doi.org/10.1117/12.457470

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available