Optical studies in Er3+ doped SrY2O4 upconverting phosphors for display devices

The chemical co-precipitation technique have been used to synthesize the Er3+ doped SrY2O4 phosphors. The frequency upconversion (UC) emission spectra in the range 400-900 nm were recorded upon the 980 nm radiation. The UC spectra exhibits five distinct bands peaking at similar to 490 nm, similar to 525 nm, similar to 550 nm, similar to 667 nm and similar to 798 nm owing to the electronic transitions of Er3+ ions. The UC mechanism has been described with the suitable energy level diagram and the pump power dependent study. The Commission International de l'Eclairage (CIE) chromaticity diagram shows that the prepared phosphor is capable of emitting in intense green region and thus can be applied in fabricating display devices.