![]() ![]() The unique upconversion process has enabled a diversity of applications ranging from bioimaging to solar energy conversion and optical storage 8, 9, 10, 11, 12, 13. ![]() ![]() Upconversion primarily takes advantage of lanthanide-doped materials, in which the stepwise excitation through the energy levels of the lanthanide activators results in visible and ultraviolet emissions by successive absorption of multiple near-infrared photons 3, 4, 5, 6, 7. Amongst various luminescence processes, photon upconversion characterized by high-energy emission upon excitation of lower-energy photons is of exceptional interest. Luminescent materials that convert excitation photons into prescribed emissions are at the core of many photonics technologies such as varicolored displays and programmable photoactivation 1, 2. As various optical components are readily available in the mature telecommunication industry, our findings provide a viable solution for constructing miniaturized short-wavelength lasers that are suitable for device applications. By incorporating the core–shell–shell nanoparticles as gain media into a toroid microcavity, single-mode lasing at 289.2 nm is realized by pumping at 1550 nm. The ultralarge anti-Stokes shift of 1260 nm (~3.5 eV) stems from a tandem combination of distinct upconversion processes that are integrated into separate layers of the core–shell–shell structure. A core–shell–shell nanoparticle is developed to achieve deep-ultraviolet emission at 290 nm by excitation in the telecommunication wavelength range at 1550 nm. Herein, we present a strategy for the indirect generation of deep-ultraviolet lasing through a tandem upconversion process. However, direct ultraviolet lasing is constrained by the fabrication challenge and operation cost. Coherent ultraviolet light is important for applications in environmental and life sciences. ![]()
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