The Preparation And Properties Of Transition-metal-doped White Light Glasses

White light-emitting diodes?W-LEDs?have attracted considerable attention due to their excellent advantages such as compact size,high brightness and environmental friendliness for recent years.Among phosphor materials,transition metal ions doped white glasses show great promising future due to their excellent properties,including high color rendering index,high quantum efficiency as well as excellent physical properties and chemical stability.In this paper,two different white light glass systems of Sn²⁺ doped silicate glass?FSS?and Sn²⁺/Mn²⁺ doped fluorophosphate glass?PSM?,with excellent optical and physical properties,are prepared.To improve their optical and physical properties,the more excellent white glass-ceramic are prepared.The main contents and research results are as followed:1.A new kind of FSS glass,with good optical and physical properties,is prepared by conventional melting and quenching method.The effects of Sn²⁺ and CaF2 doping concentration on the optical properties of FSS glass were studied.As a representative,the sample FSS-1 has a high color rendering index of 98,a high quantum efficiency of 85%,a color coordinate of?0.32,0.33?and a color temperature of 6111 K under 280 nm excitation.In addition,its transmission in visible region is 88%,and its thermal conductivity at room temperature is 1.44 W/m·K.2.Based on the advantages of low melting point and high solubility for transition metal ions,PSM glass is prepared.The effect of Sn²⁺/Mn²⁺ doping concentration and the kind and ratio of alkaline earth metal fluoride on the optical properties of PSM glass is studied.As a representative,the sample PSM-11 has a high color rendering index of 91,a high quantum efficiency of 78%,a color coordinate of?0.33,0.33?and a color temperature of 5612 K under 280 nm excitation.In addition,its transmission in visible region is 90%,and its thermal conductivity at room temperature is 3.25 W/m·K.3.In order to improve the optical and physical properties,GCF and GCP microcrystal-glasses are prepared by a microcrystalline treatment of FSS-1 and PSM-11,respectively.Compared with FSS-1,the quantum efficiency and thermal conductivity at room temperature of GCF-4 are increased to 89% and 1.59 W/m·K,respectively.Compared with PSM-11,the quantum efficiency and thermal conductivity at room temperature of GCP-6 are increased to 82% and 3.55 W/m·K,respectively.