Luminescent properties of Pr3+ doped (Ca, Zn) TiO3: Powders and films

The effects of zinc on the characteristics of (Zn,Ca)TiO3:Pr3+ phosphors

“…Moreover, the CaTiO 3 :Pr 3 + is known to be located at x¼ 0.680 and y¼0.311 on the chromaticity coordinates, very closed to the coordinates of the ''ideal red'' as defined by International Commission on Illumination (CIE) [8]. To improve the luminescence intensity and enhance the after-glow efficiency of this perovskite CaTiO 3 :Pr 3 + , many efforts have been done [8][9][10][11][12][13][14]. One is to make use of different charge compensators to balance Pr 3 + ions such as using monovalent cations like Na + or Ag + to substitute Ca 2 + [14], or trivalent cations like Al 3 + or Ln 3 + (Ln¼ La, Lu, Gd) to substitute Ti 4 + , or using calcium vacancy compensation [9].…”

Synthesis of (Ca, Zn)TiO3:Eu3+ red phosphors via the sol–gel method and their luminescence properties

“…In order to enhance the luminous properties, much attention has been paid to modifying their composition [26,27] , microstructure [28,29] and the synthesis methods [30] , doping the charge compensators [12,24] , adding to the flux reagents [31] and so forth. To the best of our knowledge, there have been few investigations on Zn 2+ doped CaTiO 3 :Eu 3+ phosphors [32][33][34] , and there is no report about the detailed photoluminescence (PL) properties likely due to energy transfer from Zn 2+ to Eu 3+ in the CaTiO 3 host, or something similar.…”

Enhancement of luminescence and afterglow in CaTiO3:Pr3+ by Zr substitution for Ti

“…Among them, CaTiO 3 :Pr 3+ is of special interest due to its red emission with appropriate CIE coordinate (0.680, 0.311), which is very close to that of the 'ideal red' [1]. To improve the luminescence intensity and enhance the afterglow efficiency of this perovskite material, many efforts have been done [2,3,[10][11][12][13][14][15]. It is known that there exist two ways for increasing the emission intensity.…”

“…Another way is to substitute Ca 2+ with equivalent cations, such as Zn 2+ , Mg 2+ [3], Ba 2+ , or Sr 2+ [13]. On the other hand, the afterglow time of the red-emitting CaTiO 3 :Pr 3+ phosphors can be enhanced by substituting Zn 2+ for Ca 2+ site [14,15], or Al 3+ [16], Lu 3+ [11] for Ti 4+ site. The possible explanation is that the density of traps with reasonable depth increases in the host materials.…”