Multi-phonon-assisted relaxation and Yb3+ sensitized bright red-dominant upconversion luminescence of Ho3+ in YF3-BaF2-Ba(PO3)2 glass

Unusual bright red-dominant upconversion light was observed in Ho 3+ /Yb 3+ co-doped YF 3 -BaF 2 -Ba(PO 3 ) 2 glasses excited by the 980-nm laser diode at room temperature. The integral intensity ratios of the red upconversion emission to the green one reached about 10:1 in optimized 0.125Ho 3+ -15Y...

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