Solid state photon upconversion utilizing thermally activated delayed fluorescence molecules as triplet sensitizer

Wu, Tony C.; Congreve, Daniel N.

doi:10.1063/1.4926914

Solid state photon upconversion utilizing thermally activated delayed fluorescence molecules as triplet sensitizer

Journal Article · Mon Jul 20 04:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4926914· OSTI ID:22486321

Wu, Tony C.; Congreve, Daniel N.

The ability to upconvert light is useful for a range of applications, from biological imaging to solar cells. But modern technologies have struggled to upconvert incoherent incident light at low intensities. Here, we report solid state photon upconversion employing triplet-triplet exciton annihilation in an organic semiconductor, sensitized by a thermally activated-delayed fluorescence (TADF) dye. Compared to conventional phosphorescent sensitizers, the TADF dye maximizes the wavelength shift in upconversion due to its small singlet-triplet splitting. The efficiency of energy transfer from the TADF dye is 9.1%, and the conversion yield of sensitizer exciton pairs to singlet excitons in the annihilator is 1.1%. Our results demonstrate upconversion in solid state geometries and with non-heavy metal-based sensitizer materials.

OSTI ID:: 22486321

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 3 Vol. 107; ISSN APPLAB; ISSN 0003-6951

Country of Publication:: United States

Language:: English

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Solid state photon upconversion utilizing thermally activated delayed fluorescence molecules as triplet sensitizer

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