Structural and optical analysis of YAl3(BO3)4: Pr3+ phosphors for lighting applications

Synthesis and photoluminescent characterization of ceramic phosphors Li2MgGeO4:Ln3+ (Ln3+ = Pr3+ or Tm3+) under different excitation wavelengths

“…The evaluated chromaticity coordinates were similar to that of YAl 3 (BO 3 ) 4 . 36 Similar situation is observed for ceramic phosphors doped with thulium ions, where the values of (x,y) also depend critically on the excitation wavelengths. They are changed from blue to green region, when the excitation wavelength increases from 340 nm to 430 nm.…”

Mechanosynthesis, Structure and Photoluminescent Properties of the Pr3+ Doped LiNbO3, LiNbO3:Mg, LiTaO3 Nanopowders

“…The dominant red emission in LN:Pr specimen is caused by the transition 1 D between the levels of the Pr 3+ ion [1,[9][10][11][12]. As shown in Figure 7, the red lumin excitation spectra are dominated by two broad bands with maxima near 258 and In [4], the shape of the excitation spectra of red luminescence in LiNbO3:Pr 3+ mi ders was studied depending on the degree of deviation of their composition from ometry, and it was shown that the band with a maximum near 250 nm had the intensity in stoichiometric samples.…”

“…The dominant red emission in LN:Pr specimen is caused by the transition 1 D 2 → 3 H 4 between the levels of the Pr 3+ ion [1,[9][10][11][12]. As shown in Figure 7, the red luminescence excitation spectra are dominated by two broad bands with maxima near 258 and 345 nm.…”

“…Further, recent research on up-conversion luminescence of erbium and ytterbium-doped lithium niobate nanoparticles has shown temperature dependence that holds promise for applications in thermometry [7]. Moreover, the luminescent properties of praseodymium in other ferroelectric niobates also attracted attention as promising sensor materials [8][9][10][11][12]. The strong intensity of mechano-and photoluminescence was observed by authors [3] in congruent LN:Pr single crystals grown by Czochralski technique as well as in LN congruent crystals, co-doped with Pr and Mg. Further, the study of the mechanoluminescent and photoluminescent properties of LiNbO 3 :Pr and LiTaO 3 :Pr, prepared in form of micropowders using solid-phase synthesis from a mixture of the corresponding starting oxides and lithium carbonate was performed in [4].…”