Effect of Calcination Temperatures on Green Luminescence of Ce:YAG nanophosphor prepared by Modified Co-precipitation Method

摘要

Ce:YAG nanophosphor was synthesized by refluxer assisted co-precipitation method using AHC as precipitant. XRD result reveals the cubic phase formation without existence of other intermediate and defect phases. By HR-SEM observation, the prepared Ce:YAG exhibit non-agglomerative and spheroidal morphology with the particulate size of ~100 nm. The effect of calcination temperatures on structural and luminescence behavior of Ce:YAG nanophosphor are presented. The nanophosphor calcined at 800 °C exhibit green luminescence at 546 nm, due to 5d→4f radiative transition. By increasing the calcination temperature, the emission wavelength was slightly blue-shifted. Spectroscopic parameters such as transition energy, spin-orbital coupling, zero-phonon line and stokes shift are theoretically calculated based on the experimental emission spectra and correlated to calcination temperature dependent blue shift.