Direct Measurement of the Singlet Generation Yield in Polymer Light-Emitting Diodes

C. Rothe, S. M. King, and A. P. Monkman
Phys. Rev. Lett. 97, 076602 – Published 15 August 2006

Abstract

In this study, the singlet and triplet exciton generation yields of a representative blue-emitting conjugated polymer are directly compared using simultaneous optical and electrical excitation measurements. After carefully accounting for bimolecular triplet annihilation and knowing the independently measured solid state inter-system-crossing yield of the polymer, a singlet generation yield of 44% is obtained, in the working device, which is clearly in excess of the simple quantum statistical 25% limit.

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  • Received 27 April 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.076602

©2006 American Physical Society

Authors & Affiliations

C. Rothe*, S. M. King, and A. P. Monkman

  • Department of Physics, University of Durham, Durham, DH1 3LE, United Kingdom

  • *Corresponding author. Electronic address: carsten.rothe@dur.ac.uk

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Issue

Vol. 97, Iss. 7 — 18 August 2006

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