Room-Temperature Stimulated Emission and Lasing in Recrystallized Cesium Lead Bromide Perovskite Thin Films
| Autor: | Yana Vaynzof, Klaus Meerholz, Martin Koch, Tobias Haeger, Neda Pourdavoud, Andre Mayer, Anna Lena Giesecke, Marko Cehovski, Stefan Zaefferer, Hella-Christin Scheer, Thomas Riedl, Ralf Heiderhoff, P. J. Cegielski, Max C. Lemme, Wolfgang Kowalsky, Ivan Shutsko, Ouacef Charfi, Hans-Hermann Johannes, Detlef Rogalla, David Becker-Koch, Patrick Görrn, Andreas Henkel, Markus Stein, Selina Olthof |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Amplified spontaneous emission
Photoluminescence Materials science business.industry Mechanical Engineering Halide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Mechanics of Materials Optoelectronics General Materials Science Light emission Stimulated emission Thin film 0210 nano-technology business Lasing threshold Perovskite (structure) |
| Zdroj: | Advanced Materials |
| Popis: | Cesium lead halide perovskites are of interest for light-emitting diodes and lasers. So far, thin-films of CsPbX3 have typically afforded very low photoluminescence quantum yields (PL-QY < 20%) and amplified spontaneous emission (ASE) only at cryogenic temperatures, as defect related nonradiative recombination dominated at room temperature (RT). There is a current belief that, for efficient light emission from lead halide perovskites at RT, the charge carriers/excitons need to be confined on the nanometer scale, like in CsPbX3 nanoparticles (NPs). Here, thin films of cesium lead bromide, which show a high PL-QY of 68% and low-threshold ASE at RT, are presented. As-deposited layers are recrystallized by thermal imprint, which results in continuous films (100% coverage of the substrate), composed of large crystals with micrometer lateral extension. Using these layers, the first cesium lead bromide thin-film distributed feedback and vertical cavity surface emitting lasers with ultralow threshold at RT that do not rely on the use of NPs are demonstrated. It is foreseen that these results will have a broader impact beyond perovskite lasers and will advise a revision of the paradigm that efficient light emission from CsPbX3 perovskites can only be achieved with NPs. |
| Databáze: | OpenAIRE |
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