MgO:Dy3+ nanophosphor: Self ignition route, characterization and its photoluminescence properties

Structural and luminescent properties of Fe3+ doped PVA capped CdTe nanoparticles

“…The features of the EPR spectrum can be qualitatively explained as follows: resonance peak for Fe 3+ at around g = 2.04 can only occur if Fe 3+ is located in a site where crystal field interaction energy is less than the magnetic Zeeman energy and arises due to isolated Fe 3+ . From these results, the site symmetry of Fe 3+ in the host lattice is identified as octahedral site symmetry which also confirms the results of optical absorption studies [26]. …”

Bio-mediated Sm doped nano cubic zirconia: Photoluminescent, Judd–Ofelt analysis, electrochemical impedance spectroscopy and photocatalytic performance

“…the critical separation between Sm 3+ and the quenching site, the energy transfer mechanism of phosphors was very much highly useful. The value of R c can be estimated as suggested by Blesse using the critical concentration of the activator ion [42]. For ZrO 2 : Sm 3+ nanophosphor, volume of the unit cell (V) and the critical concentration of the Sm 3+ ion (X c ) were 4, 1 Å and 0.05 respectively [43].…”

Tunable white light emissive Mg2SiO4:Dy3+ nanophosphor: Its photoluminescence, Judd–Ofelt and photocatalytic studies

“…The 4 F 9/2 6 H 13/2 is a hypersensitive transition and strongly influenced by the crystal field [15][16][17][18][19]. Therefore, by incorporating Dy 3+ ions in Mg 2 SiO 4 host nanophosphors it is possible to tune the emission for display applications.…”

“…The variation in the intensity of other two peaks centered at 476 and 666 nm may be the cause for the tuning of the emissions towards white region. The concentration quenching might be explained on the basis of following two factors: (i) the excitation migration due to resonance between the activators is enhanced when the doping concentration was increased, and thus the excitation energy reaches quenching centers, and (ii) the activators are paired or coagulated and were changed to quenching centers[18]. Mg 2 SiO 4 with orthorhombic crystalline structure in which magnesium ions occupying two non equivalent octahedral sites within the anion closed packed structure.…”