Synthesis and luminescent behavior of UV induced Dy3+ activated LaAlO3

Green emission from trivalent cerium doped LaAlO3/MgO nano-composite for photonic and latent finger printing applications

“…S. Kozuka et al , I. S. Silveira et al , D. Singh et al , M. Beheshti et al have reported it to be rhombohedral whereas authors such as P. Kumar et al , E. B. Shaik et al and P. Ankoji et al have reported it to be belonging to later space group having primitive cubic structure. 32–38 LAO is known to transit from rhombohedral to primitive structure around 800 K. 39 So, at room temperature its XRD should be ascribed to rhombohedral space group. To ascertain the same, Rietveld refinement of diffractograms using both the space groups have been performed and displayed in Fig.…”

“…The diffraction prole of the nano-composite so formed can be ascribed to the reference JCPDS card #87-0653 for MO (space group: Fm have reported it to be belonging to later space group having primitive cubic structure. [32][33][34][35][36][37][38] LAO is known to transit from rhombohedral to primitive structure around 800 K. 39 So, at room temperature its XRD should be ascribed to rhombohedral space group. To ascertain the same, Rietveld renement of diffractograms using both the space groups have been performed and displayed in Fig.…”

Photoluminescence processes in τ -phase Ba 1.3 Ca 0.7- x - y SiO 4 : x D y 3+ / y Tb 3+ phosphors for solid-state lighting

“…The emission peak at 482 nm originates from the magnetic dipole transitions, whereas that at 575 nm is ascribed to the electric dipole transition (i.e. a hypersensitive transition) [41,42]. According to Judd–Ofelt theory [40,43], the yellow emission during 4 F 9/2 → 6 H 13/2 transition will be dominant when the D y 3+ ions are placed at low-symmetry sites without an inversion centre, while the blue emission during 4 F 9/2 → 6 H 15/2 transition is stronger when D y 3+ is placed at high symmetry with an inversion centre.…”

Single-Phase Silicate Phosphors (Ba1.3Ca0.7−xSiO4:xDy3+) Doped with Dysprosium for White Solid-State Lighting

“…Here, the weak PL peak at 238 nm should originate from the host absorption band, whereas that at 294 nm from the O 2− ⟶ Dy 3+ transition [24,[48][49][50]. e other excitation peaks are attributed to the electronic transition 6 H 15/2 ⟶ 4 K 15/2 at 324 nm, 6 H 15/ 2 ⟶ 6 P 7/2 at 351 nm, 6 H 15/2 ⟶ 6 P 5/2 at 363 nm, and 6 H 15/ 2 ⟶ 4 I 13/2 at 382 nm, respectively [51][52][53][54][55][56][57][58]. Figure 5(c) shows the emission spectra of the host material (Ba 1.3 Ca 0.7 SiO 4 ) without any dopant, exhibiting a broad emission band at 482 nm from the self-trapped luminescent recombination.…”

“…2 ⟶ 6 H 11/2 transitions, respectively (Figure 5(b)). Importantly, the blue light emission at 482 nm is ascribed to the magnetic dipole transition, whereas the yellow-light emission at 576 nm is due to electric dipole transition which is known to be hypersensitive and thus strongly influenced by the surrounding environment around the Dy 3+ ion [52,53]. Furthermore, according to the Judd-Ofelt theory [54], the electric dipole transition (yellow emission) will be intensified when Dy 3+ ions are located at low-symmetry sites with no inversion center, whereas the magnetic dipole transition (blue emission) will be strengthened when Dy 3+ is located at high symmetry with an inversion center.…”