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Er3+ doped potassium gadolinium molybdate (KGM) phosphor with sensitizer Yb3+ ion was synthesized by the Pechini method using citric acid and ethylene glycol. The crystallization processes of the phosphor precursors were characterized by X-ray diffraction (XRD) and thermogravimetry-differential scanning calorimetry (TG-DSC), which indicated that ultrafine uniform crystallites of KGM:Er,Yb were obtained by sintering the precursors at above 650 ℃ for 5 h. Upconversion luminescence (UL) spectra of the samples were studied by a 976 nm semiconductor laser diode (LD) excitation. The UL spectra exhibited the green and red emission bands that were attributed to the 2H11/2, 4S3/2→4I15/2 and 4F9/2→4I15/2 transitions of Er3+, respectively. The possible UL mechanisms of Er3+ were explained by means of an energy level diagram. The maximum luminescent intensity was achieved when the concentration of Er3+, Yb3+ arrived at 1 mol.% and 20 mol.%, respectively.
Er3 + doped potassium gadolinium molybdate (KGM) phosphor with sensitizer Yb3 + ion was synthesized by the Pechini method using citric acid and ethylene glycol. The crystallization processes of the phosphor precursors were characterized by X-ray diffraction (XRD) and thermogravimetry-differential scanning calorimetry TG-DSC), which indicated that ultrafine uniform crystallites of KGM: Er, Yb were obtained by sintering the precursors at 650 ° C for 5 h. Upconversion luminescence (UL) spectra of the samples were studied by a 976 nm semiconductor laser diode The UL spectra presents the green and red emission bands that were attributed to the 2H11 / 2, 4S3 / 2 → 4I15 / 2 and 4F9 / 2 → 4I15 / 2 transitions of Er3 +, respectively. The possible UL mechanisms of Er3 + were explained by means of an energy level diagram. The maximum luminescent intensity was achieved when the concentration of Er3 +, Yb3 + arrived at 1 mol.% and 20 mol.%, respectively.