Solid state photon upconversion utilizing thermally activated delayed fluorescence molecules as triplet sensitizer
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.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- FG02-07ER46474; DMR-1419807
- OSTI ID:
- 1196453
- Alternate ID(s):
- OSTI ID: 1420550; OSTI ID: 1547023
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Vol. 107 Journal Issue: 3; ISSN 0003-6951
- Publisher:
- American Institute of PhysicsCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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