The room absorption spectra of TWN, TWHN-0, and TWHN-0.5 glasses. The inset shows the magnified absorption band of Ho3+ near 900 nm in TWHN-0 glass.
IR fluorescence spectra in Nd3+/Ho3+ co-doped TWHN-x (x = 0, 0.2, 0.5, 1, 1.5, 2) glasses with 808 nm excitation. The inset shows fluorescence decay curve of Ho3+:5I7 level in TWHN-0.5 glass.
Simplified energy level diagrams of Nd3+ and Ho3+ with relative transitions and energy transfer processes between Nd3+ and Ho3+.
(a) Upconversion luminescence spectra in TWHN-x (x = 0, 0.2, 0.5, 1, 1.5, 2) glasses upon 1.8 W 808 nm excitation. (b) NIR fluorescence spectra in TWHN-x glasses under 808 nm excitation. The inset shows the magnified emission band of Ho3+ near 1200 nm.
(a) Absorption and emission cross sections in TWHN-0.5 glass, (1) Nd3+:4F3/2→4I9/2; (2) Ho3+:5I8→5I5; (3) Ho3+:5I8→5I7; (4) Ho3+:5I7→5I8. Note that the absorption cross section of Ho3+ near 900 nm is magnified 10 times. (b) Fluorescence decay curves of Nd3+ in TWN and TWHN-0.5 glasses.
Comparison of J-O intensity parameters of Ho3+ ions in various glass hosts.
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