Preparation and luminescence properties of SrLaLiTeO6:Dy3+,Eu3+phosphors
The commercial synthesis scheme of white light emitting diode(LED)lacks a red light component,resulting in high color temperature and poor color rendering of the synthesized white light.Therefore,the development of single-phase warm white phosphors with excellent performance has always been an important research topic in the field of white LED.SrLaLiTeO6:Dy3+,Eu3+inorganic phosphors were prepared by a solid state reaction method with Dy3+and Eu3+as dopants and SrLaLiTeO6(SLLT)as matrix.The crystal structure and optical properties of the phosphors were analyzed by X-ray diffraction,fluorospectrophotometry and chromaticity coordinates analysis.The results show that Dy3+and Eu3+successfully enter the SLLT crystal,which does not produce impurities.SLLT:0.07Dy3+,y Eu3+phosphors can simultaneously emit blue,yellow and red light under 351 nm excitation,which proves that there is an energy transfer between Dy3+and Eu3+to make up for the lack of red emission of single-doped Dy3+phosphors.The optimum doping concentration of Eu3+ion is 0.05,where the chromaticity coordinate is(0.391 9,0.380 9),the correlated color temperature is 3 733 K,which is close to the warm white light region.Consequently,SrLaLiTeO6:Dy3+,Eu3+phosphor is an excellent warm white LED phosphor.
phosphorluminescent propertySrLaLiTeO6:Dy3+,Eu3+warm white lightsolid state reaction
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