Design,Preparation And Properties Of Oxide Glass/Ceramic Phosphors

Functional oxide glass/ceramics have broad applications prospect in LED/LD phosphors,which are expected to solve the thermal problems of the phosphors pumped under high power density fundamentally.However,glass/ceramics still have some broblems as phosphors,including untunable and poor refractive index matching.So carrying out the studying on the preparation and properties of tunable light emitting glasses and the refractive index matching glass ceramics/transparent ceramics is of great research value and practical significance.The phosphate/fluorphosphate glass ceramic not only has excellent optical performance,but its potential ion conductor characteristic is different from other oxide glass ceramics,therefore research on its electrical performance has important research value.A kind of Tm³⁺/Dy³⁺/Sm³⁺co-doped fluorophosphate glass with continuous tunable color luminescence is designed and prepared.The relationship between the excitation wavelength and the CIE color coordinates are studied systematically,and the energy transfer between the activated ions are also discussed.The emission colors of the glass are continuous changing from blue/cold-white to warm-white/yellow by precise controlling of the excitation wavelength.The emitting color of sample are very close to the standard white light point?0.333,0.333?by the UV light?353 nm and 362 nm?excitation.When the Tm³⁺/Dy³⁺/Sm³⁺are used as triple-doped active ions,the emission colors of the FP glass can be continuous changed from violet/blue to orange/yellow.A kind of Sn²⁺/Mn²⁺doped fluorophosphate glass with continuous tunable broad-band emission?380-760 nm?is also prepared.By adjusting the ratio of SnO and MnO,the color can be attuned from blue/cold white to warm-white/red.Notably,the FP glass can also service as a white light phosphor by controlling the content of SnO/MnO,which has excellent optical properties that,CIE chromaticity coordinate,CRI and QE are?0.33,0.29?,84 and 0.952,respectively.Importantly,these FP glasses have high thermal conductivity?3.25-3.70 W/m·K?and good chemical stability in water?80 ^oC?.A kind of high-melting-point lead-free glass with high glass transition temperature?T_g=711^oC,T_x=909 ^oC?and refractive index matching to LuAG is designed and prepared.According to the properties of phosphor,the heat distribution and the light extraction efficiency are simulated under different excitation power.The effect of sintering conditions on the lumen efficiency of phosphor are studied in detail.The lumen efficiency of phosphor in optimum sintering conditions is 212.65lm/W,which is excited by 450 nm light?14.59W/mm²?.A series of rare-earth doped YAG transparent ceramics which can be used as phosphor of laser/high power LED are prepared by vacuum sintering method.The optical and thermal properties of Dy,Ce/Dy and Sm doped YAG transparent ceramics are studied.The Dy-doped YAG transparent ceramics have a white light emission with color coordinate of?0.33,0.35?when excited by 351 nm and 365 nm LED chip,and can withstand the excitation light power density of 13W/mm².When the Ce/Dy co-doped YAG transparent ceramics are excited by UV light source,the color coordinate and color temperature can be?0.33,0.35?and 5609K respectively.The Sm-doped YAG transparent ceramics have orange light emission,which can effectively remedy the deficiency of Dy/Ce:YAG transparent ceramics in the red area.A series of phosphate/fluorphosphate glass ceramic ionic conductors are designed and prepared.By controlling the raw material,additive,melting and heat treatment condition,the electrical properties of the glass ceramics are studied.The pure LAGP crystal phase glass-ceramic is obtained,which has 2³×10^-4 S/cm ionic conductivity.Besides,the effect of NaF and hydroxyl content on the conductivity and thermal stability of glass electrolyte are studied systematically.The best value of the room-temperature sodium ion conductivity is 5.52×10^-5 S/cm,which is higher than a lot of chalcogenide glasses.