Journal
ACS ENERGY LETTERS
Volume 3, Issue 10, Pages 2390-2395Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b01528
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Funding
- State of Washington through the UW Clean Energy Institute (Washington Research Foundation)
- NSF [ECC1542101]
- University of Washington
- Molecular Engineering and Sciences Institute
- Clean Energy Institute
- National Institutes of Health
- National Science Foundation (NSF) through the UW Molecular Engineering Materials Center
- National Science Foundation (NSF) through a Materials Research Science and Engineering Center [DMR-1719797]
- National Science Foundation (NSF) [DMR-1807394]
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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.
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