Photodegradation of organic light-emitting devices observed in nitrogen-filled environment

X. Z. Wang, X. D. Gao, Y. C. Zhou, Z. T. Xie, Q. L. Song, X. M. Ding, X. Y. Hou

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Degradation of organic light-emitting devices (OLEDs) upon ultraviolet (UV) irradiation has been studied by measuring luminance-voltage (L-V) and current-voltage (I-V) characteristics of the devices in a nitrogen-filled glove-box. Photo-oxidation or reaction is no longer the main origin of the degradation for the devices protected by nitrogen. Conventional double-layer OLEDs with tris(8-hydroxyquinoline) aluminum (Alq3) as the electron transport material and single-layer devices containing Alq3 as the only organic material exhibit different degradation behaviors: both L-V and I-V characteristics degrade severely for the irradiated double-layer devices, whereas whether I-V degrades or not in a single-layer device is closely related to the species of the charge carriers flowing in the device. By comparing electroluminescent and photoluminescent degradation behaviors of the single-Alq3-layer devices, we conclude that lowered fluorescent quantum efficiency and hole current after UV irradiation are two origins of the degraded characteristics of the devices isolated from the moist environment.

Original languageEnglish (US)
Pages (from-to)2171-2174
Number of pages4
JournalThin Solid Films
Volume516
Issue number8
DOIs
StatePublished - Feb 29 2008

Keywords

  • Electrical properties and measurements
  • Electronic devices
  • Organic semiconductors
  • Photoluminescence

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