Structural and spectroscopic analysis of thermally stable Dy3+ activated Na4Ca4Si6O18 phosphor for optoelectronic device applications

Thermally stable and color-tunable bi-activated (Dy3+/Eu3+) alkaline earth metasilicate phosphor for luminescent devices

“…Pure crystalline hexagonal Na 4 Ca 4 Si 6 O 18 host is formed with the P3 2 space group containing V = 1249.42 Å 3 along with the value of lattice parameters as a = b = 10.46 Å; c = 13.17 Å. 22 XRD proles of NCMS phosphors activated with Dy 3+ and Dy 3+ /Eu 3+ ions agree with standard XRD patterns, which implies that the crystal structure remains the same even aer adding dopants. Moreover, ionic radii of both sensitizer (Dy 3+ : 0.912 Å) and activator (Eu 3+ : 0.947 Å) ions are close to the ionic radii of Ca 2+ (1.00 Å) ion.…”

“…Ocean optics spectrophotometer accessories assembled with an optical bre system were used to determine the thermal stability of the as-synthesized phosphor. 22 XRD proles of NCMS phosphors activated with Dy 3+ and Dy 3+ /Eu 3+ ions agree with standard XRD patterns, which implies that the crystal structure remains the same even aer adding dopants. Moreover, ionic radii of both sensitizer (Dy 3+ : 0.912 Å) and activator (Eu 3+ : 0.947 Å) ions are close to the ionic radii of Ca 2+ (1.00 Å) ion.…”

“…The optimized calcination temperature has been used as 950 °C to synthesize all NCMS samples. 22 The samples with 0.0, 1.0, 3.0, 4.0, 5.0, and 6.0 mol% of Dy 3+ concentrations in NCMS phosphor are coded as NCMS, ND1, ND3, ND4, ND5, and ND6, respectively. Further, the Eu 3+ ion is co-doped with the 5.0 mol% Dy 3+ doped NCMS phosphor (optimized) by increasing the Eu 3+ concentration from 1.0 mol% to 10.0 mol%, named as NDE1 to NDE10.…”

Structural and photoluminescent features of Eu3+ activated single‐phase niobate phosphor for lighting applications

“…The particle's average size is in the range of 4–6 μm in dimension. It is recognized that micrometer‐sized crystalline powder would be very much acceptable for the preparation of an energy‐saving white light emitting device for SSL applications 21 . Figure 2B,C indicates the elemental analysis and energy‐dispersive spectrum (EDS) of BNNO: 5.0 mol% Eu 3+ powder sample.…”

“…It is recognized that micrometer-sized crystalline powder would be very much acceptable for the preparation of an energy-saving white light emitting device for SSL applications. 21…”