Abstract

From the absorption spectrum of CaF2:Ho3+, Judd–Ofelt intensity parameters were estimated as Ω2=0.018×10-20 cm2, Ω4=0.57×10-20 cm2, and Ω6=0.587×10-20 cm2. Radiative transition probabilities and radiative lifetimes were also estimated for some of the levels. We observed red-to-green, -blue, and -violet energy upconversion in CaF2:Ho3+ with efficiencies of 0.08%, 0.13% and 1.35×10-3%, respectively, on resonant excitation of the 5 F5 state. Under site-selective excitation we also found that the blue-upconversion signal intensity was approximately three times larger than that of the green-upconversion signal intensity. On resonantly exciting the 5 I4 state we detected strong green upconversion signals from the 5 S2 state and found that excited-state absorption from 5 I7 was responsible for this process. Upconversion efficiency of the process was determined to be 8.1%. On resonantly exciting the 5 I5 state, we detected strong red emission in CaF2:Ho3+ and strong green emission in LaF3:Ho3+. Such a host-dependent upconversion frequency emission is also explained.

© 1997 Optical Society of America

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