Sodium cadmium orthophosphate NaCdPO4 was prepared by solid-state reaction method at high temperature under air atmosphere. Structural, morphology and electrical properties have been investigated. X-ray powder diffraction analysis indicated that the sample is well crystallized in the orthorhombic maricite structure with Pmnb space group. The composition and morphology of the compound were performed by energy dispersive spectroscopy coupled with scanning electron microscope. Electrical properties were carried out in the frequency range 209 Hz–1 MHz at various temperatures 595–700 K using impedance spectroscopy technique. Nyquist plots analysis revealed the presence of two contributions at different temperatures associated with grain and grain boundary. In order to explain the impedance results an equivalent circuit has been proposed. The AC conductivity was analyzed by Jonscher’s power law of frequency (σ
 ac
 (ω) ∞ Aω
 s
 ). At high frequency, the conduction mechanism was well interpreted in term overlapping large polaron tunneling.

Crystal structure characterization and AC electrical conduction behavior of sodium cadmium orthophosphate

Cation-substitution-induced controllable luminescence tuning could efficiently optimize and improve the luminescence performances of novel phosphor materials for realizing high-quality lighting. As...

Controllable Eu2+-Doped Orthophosphate Blue-/Red-Emitting Phosphors: Charge Compensation and Lattice-Strain Control

Dysprosium (Dy 3+ ) doped alkaline earth based sodium-ortho phosphate (MNa[PO 4 ], where M = Mg, Ca, Sr and Ba) phosphors were prepared by solution combustion method. The phosphors were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), fluorescent spectrophotometry and UV–vis spectroscopy. The XRD and FE-SEM results confirm that the samples contain mixture of phases of crystals. The band gap of the phosphors was calculated from diffuse reflectance spectra data using the Kubelka–Munk function. The excitation spectra of the phosphors were characterized by broadband extending from 250 to 500 nm. Upon near-UV excitation, the phosphor emits intense blue and yellow light with a weak red bands, which originated from 4 F 9/2  →  6 H 15/2 , 6 H 13/2 , 6 H 11/2 transitions of Dy 3+ ion. Luminescence features of MNa[PO 4 ]-Dy 3+ are discussed on the basis of crystal structures of the host lattices. The effect of alkaline metal ions on the luminescence properties of MNa[PO4]-Dy 3+ phosphors was studied. The Dy 3+ ions have structure-dependent transitions due to the lattice sites they occupy in each particular host. The calculated CIE (Commission Internationale de l'Eclairage) coordinates were found to be lying in the white and blue regions of the horse shoe plot of color gamut. The PL excitation and emission data suggest that the studied MNa[PO 4 ]-Dy 3+ phosphors could be used as near UV excited white LEDs.

Study of luminescent behavior and crystal defects of different MNa[PO4]-Dy3+ phosphors (M = Mg, Ca, Sr and Ba)

Rare Earth (RE) doped color tunable phosphors for white light emitting diodes

Luminescent performance of Ca2SnO4:Tb3+ phosphors with Li+ co-doping

Li doping effect on the photoluminescence behaviors of KSrPO4:Dy3+ phosphors for WLED light

Luminescence and microstructural features of Dy3+-activated KZnPO4 phosphors

A novel reddish orange phosphor CaIn2O4:Sm3+ codoped with Zn2+ or Al3+ ions was prepared by solid state reaction and their luminescence properties were investigated under near ultraviolet excitation. The strategy of Zn2+ or Al3+ ions codoping was used with the aim to improve the luminescence properties of CaIn2O4:Sm3+, but the concrete effects of the two ions is different. The introduction of Zn2+ ions can produce ZnIn' defects that favor charge balance in CaIn2O4:Sm3+ to facilitate its photoluminescence. The effect of Al3+ ions codoping can effectively transfer energy from charge-transfer absorption band to characteristic transition of Sm3+ ions, utilizing more energy from host absorption for the photoluminescence of Sm3+ ions. Based on these mechanisms, the luminescence intensity of CaIn2O4:0.6%Sm3+ was enhanced to 1.59 times and 1.51 times when codoping amount of Zn2+ and Al3+ ions reached 0.6%. However, the chromaticity coordinates of CaIn2O4:0.6%Sm3+ almost did not have any changes after Zn2+ ions or Al3+ ions codoping; those are still located at reddish orange region. The excellent luminescence properties of CaIn2O4:0.6%Sm3+,0.6%Zn2+ and CaIn2O4:0.6%Sm3+,0.6%Al3+ demonstrate that they both have potential application value as new-style reddish orange phosphors on light-emitting diode.

/pdf/the-photoluminescence-behaviors-of-a-novel-reddish-orange-2w4m6e457j.pdf

The photoluminescence behaviors of a novel reddish orange emitting phosphor CaIn 2 O 4 : Sm 3+ codoped with Zn 2+ or Al 3+ ions

Novel warm-white emitting phosphors CaIn2O4:Dy3+ co-doped with Gd3+, Zn2+, or Al3+ ions were prepared by solid state reaction. In this paper, a strategy of co-doping with different ions was used with the aim of affecting the luminescence properties of CaIn204:0.6%Dy3+ under NUV excitation. The luminescence intensities of CaIn2O4:0.6%Dy3+ were enhanced by 0.2% Gd3+ or 0.2% Zn2+ ions co-doping under 367 nm excitation, but lowered by co-doping with 0.2% Al3+ ions. Furthermore, the chromaticity coordinates of CaIn2O4:0.6%Dy3+ can be tuned from the cold-white region to warm-white region with Gd3+ or Zn2+ ions co-doping. These findings show that CaIn2O4:0.6%Dy3+,0.2% Gd3+, and CaIn2O4:0.6%Dy3+,0.2% Zn2+ have potential application value as new warm-white LED phosphors.

Synthesis and Photoluminescence Characteristics of CaIn2O4:Dy3+ Phosphors Co-Doped with Gd3+, Zn2+ or AI3+ Ions.

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Papers

Li doping effect on the photoluminescence behaviors of KSrPO4:Dy3+ phosphors for WLED light

Luminescence and microstructural features of Dy3+-activated KZnPO4 phosphors

The photoluminescence behaviors of a novel reddish orange emitting phosphor CaIn 2 O 4 : Sm 3+ codoped with Zn 2+ or Al 3+ ions

Synthesis and Photoluminescence Characteristics of CaIn2O4:Dy3+ Phosphors Co-Doped with Gd3+, Zn2+ or AI3+ Ions.