Design,Synthesis And Luminescence Properties Of High Thermal Stability Red Phosphor For High Power Density Excitation Light Source

With the development of industrial lighting,high power and laser lighting is becoming popular.The red phosphor directly affects the white light performance of the device,meanwhile,the device temperature will rise as high as 150℃in actual operation,which seriously affects the luminescence performance.As an important component of illuminating equipment,fluorescent materials directly determine it is quality.It is urgent to develop a kind of fluorescent material which has excellent thermal stability under high power excitation to solve the adverse effects caused by thermal effects and meet the needs of efficient and reliable high power solid-state lighting.The rigid structure and manufacturing defects of materials are effective methods explored by most scholars to improve the thermal stability of materials.The research content of this paper is as follows:（1）Rb Zn F₃:Eu³⁺red phosphors were prepared by co-precipitation reaction and emitted red light with a central wavelength of 592 nm under 394 nm excitation.Anomalous thermal quenching occurs and Rb Zn F₃ is a highly rigid perovskite structure.Reuse ion inequitable doping makes the material defects and trap to catch the electronic and release,high temperature defect fill the release process of the abnormal heat quenching performance provides the important role.Through crystal structure analysis and thermoluminescence analysis,it is clarified that the reason of this phenomenon is the synergistic effect of structural rigidity and defects,which provides the direction for designing red phosphors with excellent thermal stability.（2）Sr₃Ga₂Sn_1.5Si_2.5O₁₄:Eu³⁺red phosphors were prepared by solid state reaction at high temperature,emitting red light at 618 nm under 395 nm excitation.The material structure and luminescence properties are also found to have good thermal stability.The WLED device with excellent performance is prepared by using this material,which provides new ideas for design materials.