Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 21, Pages 7503-7507Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b03731
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Funding
- U.S. Army [W911NF-14-1-0260]
- National Science Foundation [CHE-1152677, CHE-1351663]
- Direct For Mathematical & Physical Scien [1152677] Funding Source: National Science Foundation
- Division Of Chemistry [1152677] Funding Source: National Science Foundation
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We investigate the parameters affecting the upconversion of visible light in a hybrid organic inorganic system based on CdSe nanocrystal (NC) sensitizers, 9-anthracene carboxylic acid (9-ACA) transmitter, and diphenylanthracene (DPA) annihilator. Seven wurtzite CdSe NCs ranging in photoluminescence quantum yield (PLQY) from 2.0% to 11%, and in diameter from 2.7 to 5.1 nm, were used in combination with the 9-ACA and DPA molecules. Using 2.7 nm diameter CdSe NCs, we show that the upconversion quantum yield has a quadratic to linear dependence on NC sensitizer concentration. Additionally, upconversion efficiency correlates positively with 9-ACA surface coverage on CdSe NCs and NC PLQY but negatively with particle size. This work clearly illustrates the path toward designing nanocrystal-molecule combinations with high upconversion efficiency that have potential applications in the fields of bioimaging, solar energy conversion, and data storage.
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