Analysis of thermal degradation of organic lightemitting diodes with infrared imaging and impedance spectroscopy

Kiyeol Kwak, Kyoungah Cho, Sangsig Kim

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

We propose a route to examine the thermal degradation of organic light-emitting diodes (OLEDs) with infrared (IR) imaging and impedance spectroscopy. Four different OLEDs with tris (8- hydroxyquinolinato) aluminum are prepared in this study for the analysis of thermal degradation. Our comparison of the thermal and electrical characteristics of these OLEDs reveals that the real-time temperatures of these OLEDs obtained from the IR images clearly correlate with the electrical properties and lifetimes. The OLED with poor electrical properties shows a fairly high temperature during the operation and a considerably short lifetime. Based on the correlation of the real-time temperature and the performance of the OLEDs, the impedance results suggest different thermal degradation mechanisms for each of the OLEDs. The analysis method suggested in this study will be helpful in developing OLEDs with higher efficiency and longer lifetime.

Original languageEnglish
Pages (from-to)29558-29566
Number of pages9
JournalOptics Express
Volume21
Issue number24
DOIs
Publication statusPublished - 2013 Dec 2

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint

Dive into the research topics of 'Analysis of thermal degradation of organic lightemitting diodes with infrared imaging and impedance spectroscopy'. Together they form a unique fingerprint.

Cite this