Energetic structure of Sm³⁺ luminescence centers in Sr₂TiO₄

Abstract

The luminescent material based on the strontium orthotitanate (Sr2TiO4) matrix doped with 1% of a mole of samarium was obtained using the typical solid-state synthesis method under a neutral atmosphere...

Lanthanide ions (Eu3+, Er3+, Pr3+) as luminescence and charge carrier centers in Sr2TiO4

“…The PCE spectrum of STO:Er is similar to those of STO:Eu and STO:Sm shown in ref. 29. The difference in photocurrents between the undoped and doped samples is clearly visible.…”

“…A similar behavior was previously observed for the Sm 3+ doped sample. 29 However, this luminescence feature is not observed in the case of the samples doped with Pr 3+ and Er 3+ . The two different compensation mechanisms explain the two independent emission centers in the matrix characterized by only one crystallographic center that the dopants can occupy.…”

“…Similar luminescence features to these observed for Eu 3+ were previously observed in the case of STO doped with Sm 3+ . 29 The two non-equivalent emission spectra also characterized the luminescence of Sm 3+ . The typical and known emission in the literature originated from Sm 3+ at the site with lower symmetry, while the additional one was from Sm 3+ at the high symmetry site.…”

Photoluminescence enhancement of orange-emitting Ca5(PO4)2SiO4:Sm3+ phosphor through charge compensation of A+ (Li+, Na+ and K+) ions for white light-emitting diodes

“…3(a), there are several excitation peaks at 343 nm, 360 nm, 372 nm, 402 nm and 471 nm, resulting from the electron transitions 6 H 5/2 → 4 K 17/2 , 6 H 5/2 → 4 D 5/2 , 6 H 5/2 → 6 D 7/2 , 6 H 5/2 → 4 K 11/2 and 6 H 5/2 → 6 I 13/2 of Sm 3+ , respectively. 40,41 The excitation spectra reveals that this kind of phosphor can absorb even n-UV blue light to obtain the energy for transition to the 4f orbital. In the emission spectra of C 5− x PSO: x Sm 3+ phosphors (Fig.…”

Efficient and zero thermal quenching Sm3+-activated Li2LaTiTaO7 phosphor for white LEDs

“…18,19 Recently, Sm 3+ -doped phosphors have caused concerns in w-LEDs, such as KBaY(MoO 4 ) 3 :Sm 3+ , Ca 2 ZnSi 2 O 7 :Sm 3+ , NaSrLa(MoO 4 )O 3 :Sm 3+ , LiSrVO 4 :Sm 3+ , Ca 2 InSbO 6 :Sm 3+ , NaCaTiTaO 6 :Sm 3+ , Ca 2 GdNbO 6 :Sm 3+ , Ca 2 LaNbO 6 :Sm 3+ , Ca 2 LaSbO 6 :Sm 3+ , Ca 5 (PO 4 ) 2 SiO 4 :Sm 3+ , NaKLaNbO 5 :Sm 3+ , and Sr 2 TiO 4 :Sm 3+ . 20–31…”