Crystal structure and luminescence dynamics of highly pure LiM(PO_(3))_(3):Eu^(3+)(M=Sr,Ca) red phosphors for white light emitting diodes  

作　　者：Payal Khajuria M.Manhas A.K.Bedyal Ankush Vij H.C.Swart Vinay Kumar 

机构地区：[1]Department of Physics and Astronomical Sciences,Central University of Jammu,Rahy-Suchani.Samba,1143J&K,India [2]Department of Physics,School of Sciences,Cluster University of Jammu,Canal Road,Jammu,180001,India [3]Department of Physics,University of Petroleum and Energy Studies,Dehradun,Uttarakhand,248007,India [4]Department of Physics,University of the Free State,P.O.Box 339,Bloemfontein,ZA 9300,South Africa

出　　处：《Journal of Rare Earths》2024年第8期1470-1478,I0002,共10页稀土学报（英文版）

基　　金：Defence Research and Development Organization (DRDO),Govt.of India for financial support under DIA -KCOE (Kalam Centre of Excellence) reference no.KCST-SS02/2020。

摘　　要：Highly pure red phosphors LiM(PO_(3))_(3):Eu^(3+)(M=Sr,Ca) doped with Eu^(3+)(1 mol%) were synthesized via solution combustion method and their crystal structure and luminescence dynamics were studied to explore its suitability in white light emitting diodes.The Rietveld refinement analysis of the powder Xray diffraction patterns reveals that the phosphors belong to the pure triclinic phase of LiSr(PO_(3))_(3) and LiCa(PO_(3)) with space group P-1(2).The scanning electron microscopy images showed the agglomerated morphology.The photoluminescence emission spectra under 393 nm show an orange band at 594 nm and a red band at 613 nm ascribed to ^(5)D_(0)→^(7)F_(1).^(5)D_(0)→^(7)F_(2) transitions of Eu^(3+)ion in both the phosphors.Moreover,the spectroscopic properties such as luminescence behaviour,and Stark splitting were used to examine the symmetry of Eu^(3+)ions in LiM(PO_(3))_(3):Es^(3+)(M=Sr,Ca) phosphors in terms of distortion induced upon doping.The Stark splitting shows that the actual site symmetry for Eu^(3+)ion was estimated to be D_(2) type for both phosphors.The photometric properties of LiCa(PO_(3))_(3):Eu^(3+)such as Commission International de l'Eclairage coordinates(x=0.64,y=0.36) near to the standard one(red),high color purity(95%) and higher brightness reveal that the phosphor has the capability of acting as a red component in n-UV white light emitting diodes.

关 键 词：Photoluminescence PHOSPHATE WLEDs Stark splitting Rare earths 

分 类 号：TN312.8[电子电信—物理电子学] TQ422[化学工程]