UV exposure and photon degradation of Alq 3 powders

M. M. Duvenhage, O. M. Ntwaeaborwa, H. C. Swart

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Tris-(8-hydroxyquinoline)aluminum (Alq 3) is a widely used light emitting material. It is also used as an electron transporting layer in organic light emitting devices (OLEDs). Degradation is, however, a major problem in these devices. The device performance is affected by parameters such as air, moisture and light exposure [1,2]. In this work the effect of photon degradation of Alq 3 in air is investigated. Alq 3 phosphor powder was synthesized using a co-precipitation method and recrystalized in acetone. The structure of the sample was determined by using x-ray diffraction (XRD). The averaging particle size estimated from the broadened XRD peaks using Scherrers equation was 40±4 nm in diameter. The excitation photoluminescence data that was collected correspond well to the absorption data. To study the photon degradation, the sample was irradiated with an UV lamp for ∼330h. The emission data was collected and the change in photoluminescence intensity with time was monitored.

Original languageEnglish
Pages (from-to)1521-1524
Number of pages4
JournalPhysica B: Condensed Matter
Issue number10
Publication statusPublished - 15 May 2012
Externally publishedYes


  • Alq powders
  • Degradation
  • Luminescent mechanism
  • Photoluminescence
  • Quenchers
  • UV exposure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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