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Issue 1, 2010

On the efficiency limit of triplet–triplet annihilation for photochemical upconversion

Author affiliations

Abstract

Photochemical upconversion is performed, whereby emitter triplet states are produced through triplet energy transfer from sensitizer molecules excited with low energy photons. The triplet emitter molecules undergo triplet–triplet annihilation to yield excited singlet states which emit upconverted fluorescence. Experiments comparing the 560 nm prompt fluorescence when rubrene emitter molecules are excited directly, using 525 nm laser pulses, to the delayed, upconverted fluorescence when the porphyrin sensitizer molecules are excited with 670 nm laser pulses reveal annihilation efficiencies to produce excited singlet emitters in excess of 20%. Conservative measurements reveal a 25% annihilation efficiency, while a direct comparison between the prompt and delayed fluorescence yield suggests a value as high as 33%. Due to fluorescence quenching, the photon upconversion efficiencies are lower, at 16%.

Graphical abstract: On the efficiency limit of triplet–triplet annihilation for photochemical upconversion

Article information


Submitted
03 Jul 2009
Accepted
05 Oct 2009
First published
03 Nov 2009

Phys. Chem. Chem. Phys., 2010,12, 66-71
Article type
Communication

On the efficiency limit of triplet–triplet annihilation for photochemical upconversion

Y. Y. Cheng, T. Khoury, R. G. C. R. Clady, M. J. Y. Tayebjee, N. J. Ekins-Daukes, M. J. Crossley and T. W. Schmidt, Phys. Chem. Chem. Phys., 2010, 12, 66 DOI: 10.1039/B913243K

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