Combustion assisted spectroscopic investigation of Dy3+ activated SrYAl3O7 phosphor for LED and TLD applications

Combustion‐assisted Ca8.25Na1.5Al6O18:Sm3+ phosphors for solid‐state lighting and WLED applications

“…Maximum crest locations found in the XRD pattern were at 17.3°, 33.2°, 40.8° and well matched with peaks created at 17.4°, 32.8°, and 40.9° obtained by XRD, which confirmed that the proposed phosphor sample was Ca 8.25 Na 1.5 Al 6 O 18 . To validate this statement, Rietveld refinement was added using Fullprof Suite software with the pseudo‐Voigt peak profile function and linear intermission of the background, [ 19–21 ] displayed in Figure 2. Rietveld refinement output illustrated that the phosphors were indexed in the P 21/c space group of the monoclinic phase of the Ca 8.25 Na 1.5 Al 6 O 18 crystal.…”

“…Excitation and emission spectra for PL analysis were generated using a Shimadzu spectrofluorophotometer RF-5301PC. Rietveld refinement was added using Fullprof Suite software with the pseudo-Voigt peak profile function and linear intermission of the background, [19][20][21] [16] Several stretching absorption bands appeared at the range 2800-3750 cm À1 and a strong band at 3638 cm À1 was noted due to fluctuations resulting from stretching of H 2 O molecules and OH groups with small amounts of moisture and humidity observed in the prepared sample. [17,18] Some bending and stretching were observed for multiple peaks that might be due to improper heating and Ca-O vibration.…”

“…In these excitation spectra, two major emission peaks at 346 nm were attributed to the 6 H 5/2 ! 4 H 9/2 [20,21] transition and at 402 nm corresponded to the 6 H 5/2 ! 4 F 7/2 transition.…”

Luminescence study of Sm3+,Eu3+‐doped Y2Zr2O7 host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

“…[29] Crystal structure and phase parameters for YZO phosphors were determined using Rietveld refinement and FullProf suite software and are F I G U R E 1 XRD pattern of YZO phosphors doping with Eu 3+ , Sm 3+ and Sm 3+ ÀEu 3+ compared with standard ICSD database of Y 2 Zr 2 O 7 displayed in Figure 2. [5,[30][31][32][33] The consistency factors are R wp = 18.21, R p = 10.36, R exp = 13.93, and χ 2 = 3.21 which are within well acceptable limits. The refinement analysis verified that the YZO phosphor had a cubic structure and belonged to the Fd3m space group (a = b = c = 10.33500 Å, and α = β = γ = 90.00 ).…”

Photoluminescence Properties and Energy Transfers in the Novel LiYMgWO6: Dy3+, Tm3+

“…5 Dy 3+ is a popular emitting center for adjusting the color in phosphor because its 4 F 9/2 → 6 H 13/2 and 4 F 9/2 → 6 H 15/2 transitions can produce blue and yellow emissions. 6,7 However, Dy 3+ activated phosphors suffer from insufficient absorption due to the f-f transitions. Tm 3+ often shows blue emission peaked at about 457 nm, 8 which has a spectral overlap with the Dy 3+ excitation, indicating the possibility of the Tm 3+ → Dy 3+ energy transfer (ET).…”