Robust frequency-upconversion lasing operated at 400 K from inorganic perovskites microcavity

Multi-photon-pumped lasing based on metal-halide perovskites is promising for nonlinear optics and practical frequency-upconversion devices in integrated photonic systems.However,at present almost all the multi-photon-pumped lasing emissions from perovskite microcavities were limited for two-photon excitation,and also suffered from a compromise in room temperature or low temperature operation conditions.In this study,based on the vapor-phase epitaxial CsPbBr3 microplatelets with high crystallinity,self-formed high-quality microcavities,and great thermal stability,low-threshold and high-quality factor whispering gallery mode lasing was realized under single-,two-,and three-photon excitation,and the lasing action is very stable under continuous pulsed laser irradiation(~3.6×10^(7) laser shots).More importantly,the three-photon-pumped lasing can be efficiently sustained at a high temperature of~400 K,and the characteristic temperature was determined to be as high as~152.6 K,indicating the highly temperature-insensitive gain threshold.Note that this is the first report on high-temperature three-photon-pumped lasing on perovskite microcavities.Moreover,an aggressive thermal cycling test(two cycles,290-400-290 K)was further performed to indicate the stability and repeatability of the multi-photon-pumped lasing characteristics.It can be anticipated that the results obtained represent a significant step toward the temperature-insensitive frequency-upconversion lasing,inspiring the exploitation of advantageous perovskites for novel applications.