Photoluminescence investigations of Li 2SiO 3:Ln (Ln=Er 3+, Eu 3+, Dy 3+, Sm 3+) phosphors

Sabikoglu I.Ayvackl M.Bergeron A.Ege A.Can N.2024-07-222024-07-22201200222313http://akademikarsiv.cbu.edu.tr:4000/handle/123456789/17724In this study, we report a comprehensive structural and photoluminescence (PL) study on lithium metasilicate (Li 2SiO 3) phosphor ceramics doped with four rare earth (RE) ions. X-ray diffraction (XRD) patterns show a dominant phase, characteristic of the orthorhombic structure Li 2SiO 3 compound and the presence of dopants has no effect on the basic crystal structure of the material. The first excited state Er 3+ luminescence at 1.54 μm arises from a sharp atomic-like radiative transition between the 4I 13/2 state and the 4I 15/2 state (ground level) under a 532 nm line of an Ar ion laser excitation. Sm doped samples showed Sm 3+ emission characteristics corresponding to the some 4G 5/2→ 6H j (j=5/2,9/2,11/2) transitions indicating a strong crystal-field effect. PL spectra of Eu doped material exhibited peaks corresponding to the 5D 0→ 7F j (j=0,1,2,3 and 4) transitions under 405 nm excitation. The dominant red color emission at 612 nm from the hypersensitive ( 5D 0→ 7F 2) transition of Eu 3+ indicates the inversion antisymmetry crystal field around Eu 3+ ion, which is favorable to improve the red color purity. Dy doped samples showed the Dy 3+ emission characteristic due to the 4F 9/2→ 6H 13/2 transition. Their relative intensity ratios also suggested the presence of a symmetric environment around the metal ion. We suggest that lithium metasilicate has enough potential candidates to be a phosphor material. © 2012 Elsevier B.V.EnglishCrystal structureDoping (additives)ErbiumEuropiumIodineLaser excitationLight emissionMetal ionsPhosphorsPhotoluminescenceRare earthsSilicon compoundsStructural ceramicsX ray diffractionAntisymmetriesColor emissionColor purityCrystal field effectsCrystal fieldsDoped materialsDoped sampleEmission characteristicsFirst excited stateGround levelIon laser excitationLithium metasilicateOrthorhombic structuresPhosphor materialsPhotoluminescence investigationPL spectraRadiative transitionsRare earth ionsRelative intensity ratioSolid state synthesisLithiumPhotoluminescence investigations of Li 2SiO 3:Ln (Ln=Er 3+, Eu 3+, Dy 3+, Sm 3+) phosphorsArticle10.1016/j.jlumin.2012.02.008