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

Rothe, C. and King, S. M. and Monkman, A. P. (2006) 'Direct measurement of the singlet generation yield in polymer light-emitting diodes.', Physical review letters., 97 (7). 076602.


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.

Item Type:Article
Keywords:Triplet formation, Electroluminescence, Polyfluorene, Efficiency, Devices.
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Publisher statement:© 2006 by The American Physical Society. All rights reserved.
Record Created:27 Nov 2006
Last Modified:13 Sep 2010 14:18

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