Wavelength conversion characteristics of Y1–x–yErxYbyBaZn3AlO7

Abstract

For future energy conversion applications, co-doped multi-component oxides Y1–x–yErxYbyBaZn3AlO7 were synthesized using a flux method and their wavelength conversion characteristics were investigated. The emission intensities of down-shifting under 365 nm excitation, which was observed in the range of 400–800 nm, were significantly changed by doping with rare-earth ions. Up-conversion emission peaks under 980 nm excitation were observed at 535, 550, and 661 nm; two or three photon processes are involved. The maximum emission intensity of bidirectional wavelength conversion under 365 nm and 980 nm irradiation was observed for x = 0.10 and y = 0.20. For simultaneous excitation under irradiation at 365 and 980 nm, an additive effect with very little alteration of energy transfer mechanisms was observed compared with that of each single excitation.