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Missing links for triplet radiative recombination in light emitting devices♣

JAI SINGH1,*

Affiliation

  1. School of Engineering and IT, B- (purple)12, Faculty of EHS, Charles Darwin University, Darwin, NT 0909, Australia

Abstract

Light emission from triplet excitons in light emitting devices (LED) is reviewed. The rate of spontaneous emission of triplet excitons is presented in inorganic amorphous semiconductors, molecular crystals and conjugated polymers containing platinum atoms in the chain. It is shown that the recently discovered new time-dependent spin-orbit-photon interaction operator is responsible for the radiative emission from triplet excitations in materials, and the transition occurs due to flipping of the spin. The rate depends on the square of the atomic number of the constituting atoms. The calculated rates and corresponding radiative lifetime agree very well with the known experimental results in conjugated polymers and inorganic amorphous semiconductors. Rates in molecular crystals are compared with those obtained from the traditional theory..

Keywords

Triplet excitons, Organic light emitting devices (OLEDs), Radiative recombination, Spontaneous mission.

Submitted at: Nov. 5, 2008
Accepted at: Sept. 9, 2009

Citation

JAI SINGH, Missing links for triplet radiative recombination in light emitting devices♣, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 9, pp. 1122-1127 (2009)