Systematic study of photoluminescence upon band gap excitation in perovskite-type titanates R1/2Na1/2TiO3:Pr (R=La, Gd, Lu, and Y)

100MeV Si8+ ion induced luminescence and thermoluminescence of nanocrystalline Mg2SiO4:Eu3+

“…In general, the emission originates from impurities present in the host material [1]. Luminescence could be attributed to f-f or f-d transitions of rare earth ions and their intensity would depend on the site symmetry or nature of ligands [2]. Rare earth doped luminescent materials find practical applications such as detectors, tunable LED's CFL, FEDs etc [3][4][5][6][7].…”

Luminescence properties of red-emitting praseodymium-activated BaTi4O9 phosphor

“…However, sulfide phosphors break down and disperse into the vacuum, contaminating the cathode and thus hindering electron emission [1][2][3][4][5]. Recently, titanates with perovskite structures including CaTiO 3 :Pr 3+ and SrTiO 3 :Pr 3+ were investigated as the host matrices for the red phosphor in FED in order to avoid these problems [6][7][8]. In this study, another titanate, namely barium tetratitanate BaTi 4 O 9 activated with Pr 3+ , was investigated.…”

Intervalence charge transfer in perovskite titanates R1/2Na1/2TiO3:Pr3+ (R=La, Gd, Y, Lu)

“…The shortest interatomic distances d(R/Na-Ti) separating R/Na and Ti sites are deduced from Ref. [12] at 3.06, 3.12, 3.18 and 3.35Å for R ¼Lu, Y, Gd and La, respectively. In the same sequence, the average R/NaOxygen distances are 2.718, 2.723, 2.726 and 2.745Å, respectively.…”

“…The structural data were taken from Ref. [12]. We obtained values ranging progressively from À 21.9 to À20.3 V while going from R ¼Lu to R ¼La.…”

“…Following up a previous investigation dedicated to the perovskite titanates R 1/2 Na 1/2 TiO 3 :Pr 3 + (R¼La, Gd, Y, Lu) [12], it is proposed, in the present paper, to apply the IVCT model to interpret the luminescence properties of these perovskites in the temperature range 77-500 K.…”