Modulation of the Pr3+ luminescence in the SrTi1-xZrxO3 solid solution

Synthesis and Photoluminescence Properties of Pr3+-Doped Ba0.5Ca0.5TixZr(1-x)O3 Perovskite Diphasic Ceramics Obtained by the Modified Pechini Method

“…The reddish-orange color emission exhibits three strong peaks centered at 602 nm, 617 nm, and 649 nm, which are associated with the recombination between 1 D2-3 H4, 3 P0-3 H6, and 3 P0-3 F2, respectively [19,23]. However, the presented approach in this paper is simplistic, and the interactions between Pr 3+ dopant and crystalline and electronic host structures are not negligible and can ultimately determine the luminescent characteristics of the material [10,42]. Figure 5a shows the photoluminescence excitation spectra of BCTZ:Pr 3+ , 0.7 ≤ x ≤ 1 ceramics monitored at 612 nm wavelength.…”

“…The second factor leading to improvement of PL intensity is closely related to the high stability of Zr 4+ ions (higher than Ti 4+ ions) [10]. It is well known [42] that the Pr 3+ ion located in the BCTZ structure has the ability to donate an electron to form the Pr 4+ . The released electron is taken over by Ti 4+ , resulting in its reduction to Ti 3+ .…”

“…Therefore, a higher number of Zr 4+ ions contribute to an increase in the number of Pr 3+ ions (not Pr 4+ ) and a decrease in the concentration of defects in the structure. Lopez-Pacheco et al [42] stated that structural-related modifications occurring with Zr 4+ substitution change the interaction between host and Pr 3+ (f-f transition), resulting in the favorable and efficient energy transfer between host and Pr 3+ .…”

“…Barandarian et al [51] presented the conception of O 2-Ti 4+ ligand-to-metal charge transfer (LMCT), which could be responsible for nonradiative deexcitation from 3 P0 to 1 D2 and, therefore, dominant red luminescence. Another idea is that both charge transfer states occur in the titanates at the same time and are influenced by host structure and composition [42]. Sun et al [43] indicated that the overlap between the conduction band of the host and the 4f5d levels of the Pr 3+ is responsible for transferring the excited electron from 4f5d, through the conduction band and nonradiative deexcitation to the 1 D2 level.…”

Facilely Direct Construction, White‐Light Emission, and Color‐Adjustable Luminescence of LaF3:Pr3+@SiO2 Yolk‐Shell Nanospheres with Moisture Resistance

“…The excitation and emission spectra of LaF 3 : x %Pr 3+ @SiO 2 yolk‐shell nanospheres ( x = 0.1, 0.5, 1, 3, 5) are described in Figure . By using 486 nm as monitoring wavelength, a broad peak (373 nm) from 4f‐5d transition and a sharp peak (442 nm) from 3 H 4 → 3 P 2 transition [ 37 ] of Pr 3+ ion are observed in Figure 6a. Under 442 nm light excitation (Figure 6b), several emission bands are obtained at 486, 537, and 601 nm, which correspond to 3 P 0 → 3 H 4 , 3 P 0 → 3 H 5 , 3 P 0 → 3 H 6 transitions [ 38 ] and the peak at 610 nm originates from 1 D 2 → 3 H 4 transitions [ 39 ] of Pr 3+ ion, respectively.…”