关键词: Ca-Si-Al-O玻璃;碳热还原氮化法;Ca-α-SiAlON∶Eu荧光粉;发光性能

Abstract: Ca-α-SiAlON∶Eu phosphors were synthesized from Ca-Si-Al-O glass with the addition of Eu2O3 by carbothermal reduction nitridation (CRN) method.The phase composition, microstructure and luminescence properties of the obtained Ca-α-SiAlON∶Eu were investigated by X-ray Diffractometer (XRD), Scanning Electron Microscope (SEM), UV-Vis spectrophotometer and fluorescent spectrophotometer.The results show that: (1)The chemical structure of Ca-Si-Al-O glass prepared from CaO, Al2O3 and SiO2 can be generally described as frame structure of SiO4 tetrahedra branched with AlO4 tetrahedra;(2) Ca-α-SiAlON doping with Eu ion with prismatic morphology are prepared at 1450 ℃ from Ca-Si-Al-O glass with the addition of Eu2O3 by CRN;(3) The obtained Ca-α-SiAlON∶Eu has high adsorption in the UV-visible spectral region.Under the excitation of 420 nm, the Ca-α-SiAlON∶Eu exhibited an intense greenish yellow emission centered at 570 nm, which is attributable to the allowed 4f65d-4f7 transition of Eu2+.

Key words: Ca-α-SiAlON∶Eu phosphors were synthesized from Ca-Si-Al-O glass with the addition of Eu2O3 by carbothermal reduction nitridation (CRN) method.The phase composition, microstructure and luminescence properties of the obtained Ca-α-SiAlON∶Eu were investigated by X-ray Diffractometer (XRD), Scanning Electron Microscope (SEM), UV-Vis spectrophotometer and fluorescent spectrophotometer.The results show that: (1)The chemical structure of Ca-Si-Al-O glass prepared from CaO, Al2O3 and SiO2 can be generally described as frame structure of SiO4 tetrahedra branched with AlO4 tetrahedra;(2) Ca-α-SiAlON doping with Eu ion with prismatic morphology are prepared at 1450 ℃ from Ca-Si-Al-O glass with the addition of Eu2O3 by CRN;(3) The obtained Ca-α-SiAlON∶Eu has high adsorption in the UV-visible spectral region.Under the excitation of 420 nm, the Ca-α-SiAlON∶Eu exhibited an intense greenish yellow emission centered at 570 nm, which is attributable to the allowed 4f65d-4f7 transition of Eu2+.