Lanthanide(Ln)-based ultraviolet C（UVC） microlasers are highly desirable for diagnostics and phototherapy. Despite of their progresses, the potential applications of UVC microlasers are strongly hindered by their lo...
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Lanthanide(Ln)-based ultraviolet C（UVC） microlasers are highly desirable for diagnostics and phototherapy. Despite of their progresses, the potential applications of UVC microlasers are strongly hindered by their low optical gain, weak light confinements, and poor device repeatability. Herein, we report a novel approach to all-in-one solve the above limitations and realize mass-manufactural UVC microlasers. The gain coefficient at 289 nm has been improved from two aspects, i.e. the enhanced absorption via LiYbF:Tm（lmoI%）@LiYbF@LiLuF core-shell-shell nanocrystals and the suppression of competitive ultraviolet ***, by spin-coating the solution onto patterned SiO substrate, high-quality Ln-based microdisks are self-assembly formed on each SiO pillar and UVC whispering-gallery-mode lasers have been realized. The resulted lasing threshold is an order of magnitude smaller than the shortest deep-ultraviolet emission at 310 nm. Importantly,the lasing wavelengths and mode numbers of UVC lasers are highly controllable and repeatable, making them suitable for mass-production for the first time.
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