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The contribution of triplet-triplet annihilation to the lifetime and efficiency of fluorescent polymer organic light emitting diodes.

King, S.M. and Cass, M. and Pintani, M. and Coward, C. and Dias, F.B. and Monkman, A.P. and Roberts, M. (2011) 'The contribution of triplet-triplet annihilation to the lifetime and efficiency of fluorescent polymer organic light emitting diodes.', Journal of applied physics., 109 (7). 074502.

Abstract

We demonstrate that the fast initial decay of a prototypical fluorescent polymer based organic light emitting diode device is related to the contribution that triplet-triplet annihilation makes to the device efficiency. We show that, during typical operating conditions, approximately 20% of the device efficiency originates from the production of singlet excitons by triplet-triplet annihilation. During prolonged device operation, the triplet excitons are quenched much more easily than the emissive singlets; thus, the contribution to the efficiency from triplet-triplet annihilation is lost during the early stages of the device lifetest. The fast initial decay of the device luminance can be removed by incorporating a triplet quenching additive into the active layer to remove any effect of triplet-triplet annihilation; this yields an increase in the device lifetime of greater than 3x and an even more significant improvement in the initial luminance decay. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3561430]

Item Type:Article
Full text:PDF - Published Version (1254Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1063/1.3561430
Publisher statement:© 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in King, S.M. and Cass, M. and Pintani, M. and Coward, C. and Dias, F.B. and Monkman, A.P. and Roberts, M. (2011) 'The contribution of triplet-triplet annihilation to the lifetime and efficiency of fluorescent polymer organic light emitting diodes.', Journal of applied physics., 109 (7). 074502 and may be found at http://dx.doi.org/10.1063/1.3561430
Record Created:25 Sep 2012 11:35
Last Modified:26 Sep 2012 09:32

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