Luminescent properties of trivalent praseodymium-doped lanthanum aluminum germanate LaAlGe2O7

Luminescent properties and particle morphology of Ca3(PO4)2:Gd3+, Pr3+ phosphor powder prepared by microwave assisted synthesis

“…The PL excitation spectra consist of a narrow peak at 274 nm and broadband at 222 nm assigned to 8 S 7/2 -6 I j transitions of Gd 3 þ ion and 4f-4f5d transitions of Pr 3 þ ion respectively [13][14]. The position of the excitation band at 222 nm is in good agreement with the predicted location of Pr 3 þ attributed to 4f5d transitions in different inorganic solid hosts [15]. Fig.…”

Rare Earth‐Doped Anatase TiO2 Nanoparticles

“…Even though the room temperature emission maxima are wide, several transitions can be assigned as follows: 3 P 0 → 3 H 5 (493 and 536 nm), 3 P 0 → 3 H 6 (620 nm) and 3 P 0 → 3 F 2 (650 nm), as can be seen in Figure 10(c). 1 D 2 -3 H 4 transition is not observed, suggesting high concentration of Pr 3+ ions in TiO 2 matrix, where cross-relaxation between neighbouring Pr 3+ ions occurs [82].…”

Spectroscopy properties and energy level location of Gd2O2S:Pr3+,Ce3+

“…The main cause of Pr 3+ emission quenching is the crossrelaxation mechanism, since the energy difference between 1 D 2 and 1 G 4 approaches that of 3 H 4 and 3 F 4 levels [13,14]. The emission spectra of 0.50 at % Pr 3+ Gd 2 O 2 S with excitation fixed at the matrix BV → BC, intraconfigurational Gd 3+ 8 S 7/2 → 6 I J , and Pr 3+ 4f 2 →4f5d transition is presented in Fig.…”

“…In general, Pr 3+ has a low emission quenching concentration, which is around 0.1-0.5 at% in oxysulfides [8,13]. The main cause of Pr 3+ emission quenching is the crossrelaxation mechanism, since the energy difference between 1 D 2 and 1 G 4 approaches that of 3 H 4 and 3 F 4 levels [13,14].…”