Red–Green–Blue Light Emission from Composition Tunable Semiconductor Micro-Tripods

Micro/nanoscale lasers that span the entire visible spectrum, especially those in red, green, and blue colors, are not only essential for a variety of optical devices but also have important applications in visible color communication, multi-color fluorescence sensing, and wavelength division multiplexing. Despite the great efforts made to achieve multi-color lasing using a variety of approaches, on-chip white light emission and even red, green, and blue multi-color lasers still suffer from considerable challenges in micro-nano structures. Here, CdS_xSe_1−x, CdS, and ZnS micro-tripod structures are successfully prepared using chemical vapor deposition approaches. The micro-photoluminescence (µ-PL) spectra and PL-mapping of these micro-tripods reveal various emissions at 630, 508, and 460 nm, respectively. Additionally, white-light emissions based on these composition-tunable tripods are realized through an end-coupling structure system. Moreover, room-temperature modes tunable lasers are observed clearly from three legs of these micro-tripods, with a low threshold of ≈48.39 µJ cm⁻² and a high quality factor of 1227.3. The realization of micro-tripods-based lasers may provide an innovative way for highly integrated photonic circuits and communications.