High-Temperature Upconverted Single-Mode Lasing in 3D Fully Inorganic Perovskite Microcubic Cavity

Perovskite is an excellent gain medium with tightly confined sub-micrometer cavity structure, but the stability is a great challenge for perovskite microcavity lasers. At present, almost all perovskite microcavity lasers are operated at room or low temperature. Achieving high-temperature lasing emission, especially single-mode lasing, is quite difficult. In this paper, on the basis of the 3D CsPbBr 3 microcubic cavity with high crystal quality, low threshold, and great light confinement, we first improve the operational temperature to 440 K in a perovskite material system. Upconverted single-mode lasing with stable output and high quality can be obtained. The improved operational temperature tolerance of the CsPbBr 3 microcubic cavity makes a step toward integrated high power density optoelectronic devices and further electrically driven lasers. In addition, by the finite element method, the mode distributions of such a 3D CsPbBr 3 microcubic cavity are analyzed systematically and clearly physical diagrams of multisets of resonances are presented. Furthermore, wavelength-tunable upconverted single-mode lasing with ultrahigh quality (8.1 × 10 3 to 1.01 × 10 4 ) can be achieved by changing the size of the microcavity. Our work clearly suggests that the 3D CsPbBr 3 microcubic cavity with ultrahigh quality and great thermal stability can be an excellent choice for an upconverted microlaser, which would offer a new platform for integrated on-chip photonics.