Emission spectra and energy transfer studies in Dy3+ and Dy3+/Eu3+ co-doped potassium fluorophosphate glasses for white light applications

Nanodiamond‐promoted white light emission in Eu, Dy, and Cu‐containing phosphate glass: quantitative analysis and colorimetric study

“…Continuing with the PL excitation analysis, the comparison of the excitation spectra obtained by monitoring Eu 3+ emission at 612 nm provides strong evidence of the well known Dy 3+ →Eu 3+ ET, [ 12,13,25 ] giving rise to the Dy 3+ 350 nm excitation peak (Table 3) in all four glasses in Figure 2 (solid red line in each panel). The most prominent excitation band in the Eu 3+ transition, [ 13 ] was located at ~362 nm (Table 2).…”

Extending Afterglow of Ga2O3 Nanocrystals by Dy3+ Dopant-Induced Carrier Trapping: Toward Design of Persistent Colloidal Nanophosphors

“…480 and 675 nm, which are assigned to 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 11/2 transitions, respectively. In contrast to forced electric-dipole 4 F 9/2 → 6 H 13/2 transition, which is formally allowed only for low symmetry sites with no inversion center, , 4 F 9/2 → 6 H 15/2 transition is generally independent of the local crystal field. , Hence, the branching ratio of 4 F 9/2 → 6 H 13/2 to 4 F 9/2 → 6 H 15/2 intensities can be used to gauge the Dy 3+ site symmetry, where the dominance of the 4 F 9/2 → 6 H 13/2 band generally suggests a low site symmetry. , This type of spectroscopic analysis for Eu-doped Ga 2 O 3 NCs has demonstrated that a significant fraction of Eu 3+ dopants substitute for octahedral Ga 3+ sites on NC surfaces, which have higher symmetry compared to bulk Ga 3+ six-coordinate sites. Given the comparable intensities of 4 F 9/2 → 6 H 13/2 and 4 F 9/2 → 6 H 15/2 bands, in the ratio that does not change significantly with increasing doping concentration, it is likely that the same phenomenon holds for Dy 3+ dopants.…”

Molten salt synthesis and luminescence of Dy3+‐doped Y3Al5O12 phosphors

“…Figure shows the excitation spectra of Y 3‐x Dy x Al 5 O 12 phosphors. There are several excitation bands in the wavelength region 300–500 nm with maximum emission intensity at about 326, 352, 366, 388, 427, 450 and 476 nm, which originated from 6 H 15/2 → 6 P 3/2 , 6 H 15/2 → 6 P 7/2 , 6 H 15/2 → 6 P 5/2 , 6 H 15/2 → 4 F 7/2 , 6 H 15/2 → 4 G 11/2 , 6 H 15/2 → 4 I 15/2 and 6 H 15/2 → 4 F 9/2 transitions of Dy 3+ . Coverage of the excitation bands was from the ultraviolet (UV) light region to the blue light region, indicating that these phosphors could be excited by light over a wide wavelength range.…”