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UC spectra of and at under LD excitation. Inset is log-log plots of the integrated emission intensities vs the excitation power.
Energy levels and ET processes of and . [(a)–(c)] ET, : MPR, (d) cooperative UC, and [(e) and (f)] cross relaxation.
NIR emission spectra of and at under LD excitation. The inset is the emission cross section calculated by the FL formula.
Temperature evolution of the experimental intensities and theoretical fitting results. The pump power of LD is fixed at . [(a)–(d)] , and [(e)–(h)] .
Physical parameters of and .
Standardized UC efficiency in different codoped materials.
Emission cross sections of in different host materials.
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