Quantum-Cutting Ytterbium-Doped CsPb(Cl1–xBrx)3 Perovskite Thin Films with Photoluminescence Quantum Yields over 190%
| Autor: | Tyler J. Milstein, Daniel M. Kroupa, Joo Yeon D. Roh, Sidney E. Creutz, Daniel R. Gamelin |
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| Rok vydání: | 2018 |
| Předmět: |
Ytterbium
Materials science Photoluminescence Photon Renewable Energy Sustainability and the Environment Band gap Doping Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics 0104 chemical sciences Fuel Technology chemistry Chemistry (miscellaneous) Materials Chemistry Thin film 0210 nano-technology Luminescence Perovskite (structure) |
| Zdroj: | ACS Energy Letters. 3:2390-2395 |
| ISSN: | 2380-8195 |
| DOI: | 10.1021/acsenergylett.8b01528 |
| Popis: | A two-step solution-deposition method for preparing ytterbium-doped (Yb3+) CsPb(Cl1–xBrx)3 perovskite thin films is described. Yb3+-doped CsPb(Cl1–xBrx)3 films are made that exhibit intense near-infrared photoluminescence with extremely high quantum yields reaching over 190%, stemming from efficient quantum cutting that generates two emitted near-infrared photons for each absorbed visible photon. The near-infrared Yb3+ f–f photoluminescence is largely independent of the anion content (x) in CsPb(Cl1–xBrx)3 films with energy gaps above the quantum-cutting threshold of twice the Yb3+ f–f transition energy, but it decreases abruptly when the perovskite energy gap becomes too small to generate two Yb3+ excitations. Excitation power dependence measurements show facile saturation of the Yb3+ luminescence intensity, identifying a major challenge for future solar applications of these materials. |
| Databáze: | OpenAIRE |
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