Direct measurement of the singlet generation yield in polymer light-emitting diodes

Rothe, C.; King, S.M.; Monkman, A.P.

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.

Citation

Rothe, C., King, S., & Monkman, A. (2006). Direct measurement of the singlet generation yield in polymer light-emitting diodes. Physical Review Letters, 97(7), Article 076602. https://doi.org/10.1103/physrevlett.97.076602

• Journal Article Type: Article
• Publication Date: Aug 1, 2006
• Deposit Date: Sep 10, 2007
• Publicly Available Date: Aug 2, 2010
• Journal: Physical Review Letters
• Print ISSN: 0031-9007
• Electronic ISSN: 1079-7114
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 97
• Issue: 7
• Article Number: 076602
• DOI: https://doi.org/10.1103/physrevlett.97.076602
• Keywords: Triplet formation, Electroluminescence, Polyfluorene, Efficiency, Devices.
• Public URL: https://durham-repository.worktribe.com/output/1569225