Energy transfer in close-packed PbS nanocrystal films

V. Rinnerbauer, H.-J. Egelhaaf, K. Hingerl, P. Zimmer, S. Werner, T. Warming, A. Hoffmann, M. Kovalenko, W. Heiss, G. Hesser, and F. Schaffler
Phys. Rev. B 77, 085322 – Published 26 February 2008

Abstract

We study the emission properties of close-packed films of PbS nanocrystals that show emission in the infrared. In time resolved photoluminescence measurements, we observe a fast decay time of 400ps and a slow component between 20 and 80ns, depending on the temperature, which are attributed to decay from core and surface states, respectively. Photoluminescence excitation and temperature-dependent photoluminescence measurements show that these states are coupled by thermal activation and energy transfer. These transfer processes efficiently replenish the core states with charge carriers from the surface states, increasing the photoluminescence yield.

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  • Received 23 August 2007

DOI:https://doi.org/10.1103/PhysRevB.77.085322

©2008 American Physical Society

Authors & Affiliations

V. Rinnerbauer, H.-J. Egelhaaf, and K. Hingerl

  • Christian Doppler Laboratory of Surface Optics, Institute of Semiconductor and Solid State Physics, University Linz, Altenbergerstrasse 69, A-4040 Linz, Austria

P. Zimmer, S. Werner, T. Warming, and A. Hoffmann

  • Institute of Solid State Physics, Technical University Berlin, Hardenbergstrasse 36, D-10623 Berlin, Germany

M. Kovalenko, W. Heiss, G. Hesser, and F. Schaffler

  • Institute of Semiconductor and Solid State Physics, University Linz, Altenbergerstrasse 69, A-4040 Linz, Austria

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Issue

Vol. 77, Iss. 8 — 15 February 2008

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