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Raman spectra of (a) GBP, GGBP, and GGP, and (b) -modified GGBP with fitting data. Curves were shifted for clarity. Solid curves: Experimental data; dash curves: Fitting data.
Absorption spectrum of -codoped GGBP glasses (a), inset shows the absorption and UC spectrum at the wavelength ranging ; And UC spectra of ions in (b) GBP, GGBP, and GGP, (c) GGBP glass with difference concentration, and (d) modified GGBP. The inset in (b) shows the laser excitation intensity dependent UC of GGBP, the inset in (c) is an optical image showing the blue-UC, and the inset in (d) illustrates the energy level diagram and the proposed UC mechanism of ions.
(1) UC and (2) decay lifetime of : level as function of the phonon energy in the host glass. Glass composition codes are (a) GBP, (b) GGBP, (c) GGP, (d) TZB, and (e) GZB. Solid lines are a guide for the eyes.
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