“…17,18 To further extend the related applications of the lanthanide-doped luminescent materials, it is necessary to improve the up-conversion luminescence efficiency as much as possible. To date several methods have been proposed and experimentally realized, such as changing the doped concentration of rare-earth ions, [19][20][21] selecting the dopant-host combination, [22][23][24] adding the codoping ions, 25 varying the excitation wavelength, 26 controlling the repetition rate and pulse duration of the excitation laser, 27,28 utilizing the two-or multi-wavelength excitation, [29][30][31] manipulating the excitation pulse shape, [32][33][34][35] and applying the electric eld or magnetic eld on the luminescent materials. 36,37 Er 3+ /Yb 3+ -codoped glass, as one of the most commonly used luminescent materials, has attracted considerable attention, but methods to improve its up-conversion luminescence efficiency are always a focus for scientists.…”