HIGHLIGHTS
- who: Xinzhu Xu from the multicolor fluorescence1- These emissions include both linear process and nonlinear processes (two-photon, three-photon, or higher-order photons). The difficulty of multicolor fluorescence is solved, but there is still a problem when applied to STED: the depletion is restricted to a certain energy level depending on the dye. Previous work has achieved efficient population inversion at metastable high energy level of the emitter by selecting the co-doping of rare-earth elements and adjusting the doping concentration. When choosing depletion corresponding to the electron transition, lowpower STED can be realized, have . . .
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