Preparation Of Dy³⁺/Eu³⁺ Doped SiO₂-PbF₂ Glass-ceramic And Its Luminescence Study

Glass-ceramic has attracted a lot of attention due to its good thermal and chemical stability and durability,and its low-energy phonons have attracted a lot of attention,and are considered to be a promising rare earth ion matrix in lighting applications.Similar to the rare earth ions in a single crystal,the rare earth ions mixed into the material have high luminescence emission intensity and quantum efficiency.Combining rare earth ions with glass-ceramic helps to combine the strengths of each other and improve material properties.Due to the advanced solid-state lighting method has the advantages of high luminous efficiency,high power efficiency,low environmental risk,small size and long life,researchers have carried out continuous exploration and found that rare earth-doped glass ceramics have the advantages of good sealing,high color rendering index and environmental protection,and are considered to replace traditional incandescent lamps and fluorescent lamps.In this paper,transparent glass ceramics with PbF₂ crystal phase were prepared by high-temperature solid-phase method,and their formation mechanism and luminescence properties were studied.The results show that both Dy³⁺,Eu³⁺single or double doped can improve the luminescence performance of glass-ceramics.This will provide a reference value for the application of glass-ceramic in light-emitting diodes.（1）Dy³⁺doped glass ceramics containing PbF₂ were prepared.Combined with X-ray diffraction,differential scanning calorimetric analysis and light transmittance curve,the optimal heat treatment conditions were determined as 460℃heat treatment for 1 h.Through X-ray diffraction test,by comparison with standard cards,it was determined that glass ceramics containing PbF₂ crystal phase were obtained.The emission intensity of Dy³⁺doped glass ceramics was studied,and the emission intensity increased and then decreased with the increase of Dy³⁺doping concentration.Compared to glass,the emission intensity of Dy³⁺doped glass ceramics is improved.At the same time,the chromaticity coordinates of 0.7%Dy³⁺doped glass ceramics are（0.3129,0.3482）,which is close to standard white light（0.3333,0.3333）.This will facilitate the use of glass-ceramic in white diodes.（2）Eu³⁺doped glass ceramics containing PbF₂ were prepared.460℃heat treatment for 1 h.The emission intensity of Eu³⁺doped glass ceramics was studied,and the trend of increasing first and then decreasing with the increase of Eu³⁺doping concentration showed a trend of first increasing and then decreasing.Compared to glass,the emission intensity of Eu³⁺doped glass ceramics is improved.As the concentration of Eu³⁺increases,the chromaticity coordinates of Eu³⁺doped glass ceramics transition from orange to red light.When the Eu³⁺doping concentration is 0.5%,the CIE is（0.6154,0.3301）,which is close to the NTSC red standard value（0.67,0.33）.This will facilitate the use of glass-ceramic in red diodes.（3）Dy³⁺-Eu³⁺co-doped glass and glass ceramics were prepared.Through the light transmittance curve,the optimal heat treatment conditions were determined to be:heat treatment at 460°C for 1h.In the emission spectrum under Dy³⁺-Eu³⁺excitation,the emission intensity of co-doped glass ceramics increased with the increase of Eu³⁺doping concentration.The emission intensity of glass is higher than that of glass.The CIE of Dy³⁺-Eu³⁺.