[Upconversion of oxide Y2O3 doped with (Yb3+ , Er3+) ions with 978 nm excitation]

Two nanomaterials Y2O3 : Er3+ and Y2O3 : (Yb3+, Er3+) were prepared by combustion on the basis of reagents Y2O3, Yb2O3 and Er2O3. The corresponding host Y2O3 : (Yb3+, Er3+) was obtained by increasing calcination temperature. Upconversion emission was obtained under 978 nm LD excitation. Comparing nanopowder oxide Y2O3 : Er3+ with nanometer materials Y2O3 : (Yb3+, Er3+) with respect to upconversion spectra, the upconversion emission of the former mainly was green upconversion and that of the latter mainly red light. However, the upconversion emission of nanopowder Y2O3 : (Yb3+, Er3+) was different from that of its corresponding host, with main red upconversion emission for the former but main green upconversion emission on the latter.