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Theoretical investigation of the organic light-emitting diode activated by nanocrystal quantum dots

K. KOHARY1,* , V. M. BURLAKOV1,2, D. G. PETTIFOR1

Affiliation

  1. Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, United Kingdom
  2. Institute for Spectroscopy Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russia

Abstract

We have developed a rate equation model to study the light emission intensity and quantum efficiency of an organic light-emitting diode (OLED), in which the emissive layer of nanocrystals (NCs) is embedded between the electron and hole transport layers of organic semiconductors, e.g. at the organic-organic interface. We have found that the NC-OLED light emission intensity and quantum efficiency are mainly affected by the efficiency of the Förster injection of excitons into the nanocrystals from the organic-organic interface, and they are less sensitive to the exciton diffusion at this interface. We have shown that there is an optimum concentration of nanocrystals, at which the light emission intensity reaches its maximum, while the quantum efficiency of the NC-OLED decreases monotonically with the nanocrystal concentration..

Keywords

Organic light-emitting diode, Förster energy transfer, Nanocrystals.

Submitted at: Nov. 28, 2006
Accepted at: Jan. 15, 2007

Citation

K. KOHARY, V. M. BURLAKOV, D. G. PETTIFOR, Theoretical investigation of the organic light-emitting diode activated by nanocrystal quantum dots, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 1, pp. 18-23 (2007)