Preparation And Luminescence Properties Of Eu³⁺/Tb³⁺Doped K₂O-B₂O₃-Al₂O₃-SiO₂ Glass Ceramics

White light emitting diodes（w-LEDs）are known as the fourth generation lighting sources,with advantages such as energy conservation,long life,and environmental protection.Currently,the more mature technology for obtaining white light is the combination of LED chips and phosphors,which has many shortcomings.Therefore,exploring new types of luminescent materials is of great significance.In this thesis,a series of Eu³⁺/Tb³⁺doped transparent glass ceramics containing KAl Si O₄ crystal phase were prepared by melting solidification crystallization method.The heat treatment conditions,luminescent properties,and fluorescent thermal stability of each system of glass ceramics were studied in detail,and the interaction between rare earth ions was analyzed and discussed.The crystallization temperature range of the precursor glass was obtained through DSC testing.Within this temperature range,the precursor glass was subjected to heat treatment under different conditions to obtain glass ceramic samples.Based on the XRD,SEM,and optical transmittance test results of the glass ceramic samples,the optimal heat treatment conditions for Eu³⁺monodoped,Tb³⁺monodoped,and Eu³⁺/Tb³⁺co-doped glass ceramics were determined to be 560℃/90 min,550℃/90 min,and 560℃/90 min,respectively,the light transmittance in the visible light region can reach 75%,78%,and80%,respectively.The optimal doping concentrations of Eu³⁺and Tb³⁺in Eu³⁺monodoped and Tb³⁺monodoped glass ceramics were determined by fluorescence spectroscopy to be 0.7%and0.9%,respectively.At this concentration,the fluorescence lifetimes were 1.648 ms and3.846 ms,respectively.Beyond this concentration,concentration quenching caused by electrical multipole interaction would occur.The energy transfer between Tb³⁺and Eu³⁺can be observed in the fluorescence spectra of Eu³⁺/Tb³⁺co-doped glass ceramics,and the energy transfer mechanism is caused by the dipole-dipole interaction.The chromaticity coordinates of 0.9%Eu³⁺-0.9%Tb³⁺doped samples are（0.3627,0.3389）,close to standard white light.The emission strengths of Eu³⁺monodoped and Tb³⁺monodoped glass ceramics containing KAl Si O₄ crystal phase can be maintained at 90%and 85%of room temperature at 458 K,respectively,and the emission strengths of Eu³⁺/Tb³⁺co doped glass ceramics at543 and 614 nm can be maintained at 97%and 70%of room temperature at 458 K,respectively,indicating that the thermal stability of the sample is good.The results show that Eu³⁺/Tb³⁺co-doped glass ceramics containing KAl Si O₄ crystal phase have potential applications in white light emitting diodes,solid-state color rendering,and other fields.