Room temperature multi-phonon upconversion photoluminescence in monolayer semiconductor WS2

作者：J. Jadczak, L. Bryja, Joanna Kutrowska-Girzycka, Piotr Kapuściński, Maciej Bieniek, Y. S. Huang, Paweł Hawrylak · 发表于：Nature Communications · 年份：2019 · DOI：10.1038/s41467-018-07994-1 · 被引用次数：100 · 研究领域：Optical properties and cooling technologies in crystalline materials、Perovskite Materials and Applications、Thermal Radiation and Cooling Technologies

Abstract Photon upconversion is an anti-Stokes process in which an absorption of a photon leads to a reemission of a photon at an energy higher than the excitation energy. The upconversion photoemission has been already demonstrated in rare earth atoms in glasses, semiconductor quantum wells, nanobelts, carbon nanotubes and atomically thin semiconductors. Here, we demonstrate a room temperature upconversion photoluminescence process in a monolayer semiconductor WS2, with energy gain up to 150 meV. We attribute this process to transitions involving trions and many phonons and free exciton complexes. These results are very promising for energy harvesting, laser refrigeration and optoelectronics at the nanoscale.