Upconversion Emission Properties of Erbium- and Ytterbium-Doped Potassium Lithium Tantalate Niobate Ceramics

【摘要】 We investigate the luminescence properties of erbium-doped and erbium-ytterbium-codoped potassium lithium tantalate niobate ceramics prepared by the solid phase syntheses method.The crystalline structure and surface morphology of these ceramics are tested by x-ray diffraction and scanning electron microscopy.The green,red,and near-infrared upconversion photoluminescence properties are analyzed by the steady-state spectra under 975 nm and 800 nm excitations.These ceramics are well sintered and tetragonal tungsten type crystalline structure with the 4mm point group and the P4bm space group.The Er³⁺upconversion emission integrated intensities increase with the increase in Er³⁺ion concentration,while the green emission decreases with the increase in Yb³⁺ion concentration under the 800nm excitation.An effective energy back transfer process from the Er³⁺⁴S_3/2state to Yb³⁺ground state plays an important role in enhancing the red emission and weakening the green emission.更多还原

【Abstract】 We investigate the luminescence properties of erbium-doped and erbium-ytterbium-codoped potassium lithium tantalate niobate ceramics prepared by the solid phase syntheses method.The crystalline structure and surface morphology of these ceramics are tested by x-ray diffraction and scanning electron microscopy.The green,red,and near-infrared upconversion photoluminescence properties are analyzed by the steady-state spectra under 975 nm and 800 nm excitations.These ceramics are well sintered and tetragonal tungsten type crystalline structure with the Amm point group and the P4bm space group.The Er³⁺ upconversion emission integrated intensities increase with the increase in Er³⁺ ion concentration,while the green emission decreases with the increase in Yb³⁺ ion concentration under the 800 nm excitation.An effective energy back transfer process from the Er^{3+ 4}S_3/2 state to Yb³⁺ ground state plays an important role in enhancing the red emission and weakening the green emission.更多还原