Photocalorimetric study on nonradiative relaxation processes and photoluminescence quantum yields in Alq3 single crystals

  • Akai I
  • Harai K
  • Kouno K
 et al. 
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Abstract

Heat generation caused by nonradiative relaxation processes in tris-8-hydroxyquinoline aluminum (Alq3) was measured at 2 K by using a photocalorimetric (PC) detecting system. At lower temperatures, the photoluminescence (PL) quantum yield is much higher than that at room temperature because of the quenching of thermal disturbance. At 2 K, the PL quantum yield of a single crystal specimen and of a vapour-deposited thin film of Alq3was estimated to be 0.76±0.03 and 0.79±0.03, respectively, under excitation above the absorption edge. On the other hand, under excitation below the absorption edge, a weak PC signal response is clearly resolved, even in the highest quality single crystal, indicating the existence of nonradiative recombination centres in the transparent energy region. © 2004 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Alq3
  • Nonradiative relaxation
  • Photocalorimetric spectroscopy
  • Photoluminescence
  • Quantum yield
  • Tris-8-hydroxyquinoline aluminum

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Authors

  • I. Akai

  • K. Harai

  • K. Kouno

  • T. Karasawa

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