Narrow Green Phosphorus β-SiAlON:Eu²⁺ Sintering At LED Backlight Display

In this paper,SiAlON as the base material,andβ-SiAlON phosphors were synthesized by high-temperature solid-state reaction method.β-SiAlON phosphors were synthesized toβ-SiMON（M=Al,Gd）:Eu²⁺doped phosphors,andβ-SiAlON:RE（RE=Eu,Tb）co-doped rare earth fluorescent powder.The XRD,material luminescence characteristics,color coordinates,particle size,particle morphology and other properties were discussed,and the main research results were showed as follows:（1）Applied high-temperature solid-state reaction method,β-SiAlON phosphors were synthesized.The X ray diffraction,emission spectra,morphology,particle size distribution were researched.The crystal structure of the SiAlON phosphor is（Si,Al）（O,N）silicon nitrogen compound of tetrahedron structure element,and the six party system,and P6₃ space group.There are mainlyα,andβtype two crystals,and possessed excellent mechanical properties,thermostability at room temperature,chemical stability and good thermal stability,and has been used as high-temperature structural ceramics.Undering the irradiation of UV lamp（365nm）,and theβ-SiAlON:Eu²⁺fluorescent powders is green.Through the measurement of fluorescence spectra,the optimum excitation peak is 285nm,and the emission peak is located about 525nm.（2）Applied high-temperature solid-state reaction method.The particle size ofβ-SiAlON:Eu²⁺green phosphor can be changed.By adjusting the main raw material particle size,crystal type,the kind of aid-sintering additives,sintering contents,sintering temperature,sintering time,sintering pressure and so on.Particle size and particle size distribution can be controlled.Finally,theβ-SiAlON:Eu²⁺green fluorescent powder with uniform particle can be generated.The particle size distribution will affect the luminescence efficiency of the backlight materials,color accuracy.So in the field of LED technology,high luminescent properties ofβ-SiAlON:Eu²⁺green phosphor,and controllable particle size are needed.（Particle diameter can be grown from a few microns to more than ten microns,the length can be grown from a few microns to can be grown thirty microns）.From spectroscopic data,in particular the FWHM,β-SiAlON:Eu²⁺green fluorescent powder can be less than55nm,which is more effective for industrial applications.Less FWHM means high purity green fluorescent powder.The brightness and quantum efficiency（QE）can be increased by using aid-sintering additives.（3）Applied high-temperature solid-state reaction method,based on the preparation ofβ-SiAlON:Eu²⁺phosphors,the matrix elements of Al can be replaced by Gd.Theβ-SiMON:（M=Al,Gd）:Eu²⁺doped phosphors can be made,and the luminescent properties can be studied.（4）Aplied high-temperature solid-state reaction method,based on the preparation ofβ-SiAlON:Eu²⁺phosphors,and Tb³⁺ions on the activator can be co-doped.Its X color coordinates can be moved from 0.30（green light）to 0.37（yellow light）.The peak wavelength can be moved from 525nm to 535nm,and their luminescent properties can be studied.