Solid state photon upconversion utilizing thermally activated delayed fluorescence molecules as triplet sensitizer
Abstract
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. In this work, 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%. These conclusions demonstrate upconversion in solid state geometries and with non-heavy metal-based sensitizer materials.
- Authors:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
- OSTI Identifier:
- 1196453
- Alternate Identifier(s):
- OSTI ID: 1420550; OSTI ID: 1547023
- Grant/Contract Number:
- FG02-07ER46474; DMR-1419807
- Resource Type:
- Published Article
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 107; Journal Issue: 3; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
Citation Formats
Wu, Tony C., Congreve, Daniel N., and Baldo, Marc A. Solid state photon upconversion utilizing thermally activated delayed fluorescence molecules as triplet sensitizer. United States: N. p., 2015.
Web. doi:10.1063/1.4926914.
Wu, Tony C., Congreve, Daniel N., & Baldo, Marc A. Solid state photon upconversion utilizing thermally activated delayed fluorescence molecules as triplet sensitizer. United States. doi:10.1063/1.4926914.
Wu, Tony C., Congreve, Daniel N., and Baldo, Marc A. Mon .
"Solid state photon upconversion utilizing thermally activated delayed fluorescence molecules as triplet sensitizer". United States. doi:10.1063/1.4926914.
@article{osti_1196453,
title = {Solid state photon upconversion utilizing thermally activated delayed fluorescence molecules as triplet sensitizer},
author = {Wu, Tony C. and Congreve, Daniel N. and Baldo, Marc A.},
abstractNote = {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. In this work, 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%. These conclusions demonstrate upconversion in solid state geometries and with non-heavy metal-based sensitizer materials.},
doi = {10.1063/1.4926914},
journal = {Applied Physics Letters},
number = 3,
volume = 107,
place = {United States},
year = {2015},
month = {7}
}
DOI: 10.1063/1.4926914
Web of Science
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Works referencing / citing this record:
Convenient One-Pot Synthesis of 1,2,3,4-Thiatriazoles Towards a Novel Electron Acceptor for Highly-Efficient Thermally-Activated Delayed-Fluorescence Emitters
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