Synthesis and photoluminescence properties of τ –Ba1.31Ca0.69SiO4:0.02Dy3+ silicate based ceramic phosphor for white light emitting diode prepared by solution combustion method

Trivalent rare-earth-codoped silicate phosphor materials (Ba1.3Ca0.7−x−y SiO4: xDy3+/yEu3+) for solid-state lighting

“…Here there are two prominent spectra in the blue and yellow color region based on 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 transitions [19,20]. On the other hand, the Eu 3+ -doped phosphors have the 4 F 6 orbitals exhibiting high phosphorescence and fluorescence properties and also have the 7 F J levels displaying a pure Russel Saunders character, and so forth [21][22][23][24][25].…”

“…However, although this approach might be working for our silicate phosphor Ba 1.3 Ca 0.7−x−y SiO 4 :xDy 3+ /yEu 3+ samples, it may be considered as a future work because currently it is out of scope. Here, the average crystallite size (D s ) could be estimated using Scherrer's equation [23][24][25],…”

“…On the other hand, the reflectance spectra located at 324 nm may originate from the f → f characteristics of Dy 3+ /Eu 3+ co-dopants (i.e., a small absorption by defects/dopants) (figures 4(b) and (d)). The optical bandgap can be estimated from the diffuse reflectance (R) spectra by using the Kubelka-Munk function, F(R) [23],…”

“…(99.9%)] were purchased from Sigma-Aldrich and used as received. The method of detailed synthesis could be found in elsewhere [23][24][25]. Here, our works were expanded by varying Eu 3+ ions as co-dopant elements from 1 to 5 mol% for the 3 mol% Dy 3+ doped Ba 1.3 Ca 0.7−x−y SiO 4 samples.…”