Abstract: The blue upconversion via Pr³⁺∶Y₂SiO₅ crystals under excitation of 579 nm laser was investigated at room temperature. The upconverted luminescence band at the blue region from 480 nm to 515 nm was obtained with orange laser excitation. The upconversion mechanism was studied by observing the absorption and excitation spectra, the dependence of upconverted luminescence on pump power, and the decay profile of the upconverted luminescence. It was found that the upconverted luminescence was produced by energy transfer upconversion (ETU) process with ¹D₂ as intermediate state.

Key words: Pr³⁺∶Y₂SiO₅ crystal, orange-to-blue frequency upconversion, energy transition upconversion