Solid state photon upconversion utilizing thermally activated delayed fluorescence molecules as triplet sensitizer
Name
1.4926914.pdf
Size
732.21 KB
Format
Adobe PDF
Checksum (MD5)
c8d8d62dcc5a0fda825aee74c6c894f7
Author(s)
Wu, Tony C
Congreve, Daniel Norbert
Baldo, Marc A
Date Issued
July 2015
Journal
Applied Physics Letters
Publisher
AIP Publishing
Citation
Wu, Tony C. et al. “Solid State Photon Upconversion Utilizing Thermally Activated Delayed Fluorescence Molecules as Triplet Sensitizer.” Applied Physics Letters 107, 3 (July 2015): 031103 © 2015 Author(s)
Version
Final published version
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. 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.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/1.4926914
