Design,Synthesis And Luminescence Properties Of Eu(Ⅱ) Doped Phosphate Single-Phase Full-Visible-Spectrum Phosphors

With the development of LED technology and more and more focus on health lighting,the manufacture of full-visible-spectrum and similar sunlight LED has become a development trend in recent years.As the core components of LED,luminous materials have become the hotspot.At present,the manufacture method of non-Blu-ray excited and full-visible-spectrum LED is mainly that UV LED excite mixed phosphors.However,this method will reduce the luminous efficiency because of the difference of luminous performance and the absorbability between different color phosphors.Because each fluorescent powder has different luminous performance,and there are problems with mutual absorption between each color,and then reduce the LED’s optical index.Therefore,the market urgently needs a high-efficiency UV excited LED.The method of acquirement full-visible-spectrum which is based on single-phase full-visible-spectrum phosphors excited by UV LED can avoid various problems caused by the solution of mixed phosphors.For single-phase full-visible-spectrum phosphors,it is mainly implemented by multi-ions doped.In this way,as the energy transmission between each emitting center,which reduces the luminous efficiency of phosphors.Therefore,in the manufacture of single-phase full-visible-spectrum phosphors,the method which using single ion doped has a great research value.In this paper,the main contents are as follows:（1）Using topological chemical reaction to prepare a novel full-visible-spectrum phosphor:Ca₉Mg Na（PO₄）₇:Eu,and then further analyzes and research the crystal structure,luminous mechanism and luminous performance of this phosphor by XRD、PLE/PL、XPS etc.Confirming that Eu enters Ca1,Ca2,Ca3,Na4 site,and topological chemical reaction regulate the Eu²⁺ion crystal field,finally realizing full-visible-spectrum launch.The WLEDs package Ra=91.8.（2）A series of novel phosphate phosphors,Ca₁₉Zn₂（PO₄）₁₄:Eu,were prepared via high-temperature solid-state method.topological chemical reaction regulate the Eu ion crystal field similarly.Finding that the phosphor has great luminous performances.The WLEDs package Ra=94.1.