CdSe nanocrystal sensitized photon upconverting film
| Autor: | Emily M. Rigsby, Dmitry A. Fishman, Sean T. Roberts, Tsumugi Miyashita, Ming Lee Tang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry General Chemical Engineering Physics::Optics Quantum yield 02 engineering and technology General Chemistry Orders of magnitude (numbers) 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Photon upconversion 0104 chemical sciences law.invention Nanocrystal law Ultrafast laser spectroscopy Optoelectronics Crystallization 0210 nano-technology business Spectroscopy Phosphorescence |
| Zdroj: | RSC advances. 11(49) |
| ISSN: | 2046-2069 |
| Popis: | Here, films using CdSe nanocrystal (NC) triplet photosensitizers in conjunction with diphenylanthracene (DPA) emitters were assembled to address several challenges to practical applications for solution-based photon upconversion. By using poly(9-vinylcarbazole) as a phosphorescent host in this film, volatile organic solvents are eliminated, the spontaneous crystallization of the emitter is significantly retarded, and ∼1.5% photon upconversion quantum yield (out of a maximum of 50%) is obtained. Transient absorption spectroscopy on nanosecond-to-microsecond time scales reveals this efficiency is enabled by an exceptionally long triplet lifetime of 3.4 ± 0.3 ms. Ultimately, we find the upconversion efficiency is limited by incomplete triplet–triplet annihilation, which occurs with a rate 3–4 orders of magnitude slower than in solution-phase upconversion systems. |
| Databáze: | OpenAIRE |
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