The experimental study of improving rare-earth doped materials's energy up-conversion efficiency

Some conditions are put forward about improving the up-conversion efficienc y through study of oxy-fluoride glasses based on TeO2, GeO2, ZnF2, SiO2 and PbF2. Hosts with low phonon energy benefit the energy up-conversion. It is also found that when the value of the quasi-field parameter (M) over bar o f the oxy-fluoride host is adjusted near to that of the M parameter of the doped rare-earth, the materials show high up-conversion efficiency. Selecti ng suitable excitation photon energy to match the level of rare-earth ions and/or sensibilizer ions is a necessary condition for high up-conversion ef ficiency. The results provide some practical guidance to prepare rare-earth doped energy up-conversion materials.