A study of the luminescence in near UV-pumped red-emitting novel Eu3+-doped Ba3Ca3(PO4)4 phosphors for white light emitting diodes

Dillip, G.R.; Raju, B. Deva Prasad

doi:10.1016/j.jallcom.2012.06.009

Cited by 79 publications

(24 citation statements)

References 46 publications

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“…As shown in the figure, the absorption peaks appeared at 220-250 nm correspond to charge transfer from O ligands to the central (PO 4 ) 3-groups, while the weak peaks around 400 nm are due to the 4f-4f inner shell transitions of Eu 3? ions [22]. The similar bands were also observed in the excitation spectrum of the phosphor.…”

Section: Diffuse Reflectance Spectrasupporting

confidence: 75%

Synthesis, photoluminescence and Judd–Ofelt parameters of LiNa3P2O7:Eu3+ orthorhombic microstructures

et al. 2015

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We report, for the first time, the photoluminescence properties of Eu 3? -doped LiNa 3 P 2 O 7 phosphor, synthesized by a facile solid-state reaction method in air atmosphere. The crystal structure and phase purity of the phosphors were analyzed by X-ray diffraction analysis. Orthorhombic structural morphology was identified by scanning electron microscopy. The phosphate groups in the phosphor were confirmed by Fourier transform infrared analysis. Bandgap of the phosphor was calculated from the diffuse reflectance spectra data using Kubelka-Munk function. Under 395-nm UV excitation, the phosphors show signs of emitting red color due to the 5 D 0 ? 7 F 2 transition. In accordance with Judd-Ofelt theory, spectroscopic parameters such as oscillator intensity parameter X t (t = 2), spontaneous emission probabilities, fluorescence branching ratios and radiative lifetimes were calculated and analyzed for the first time in this system.

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Section: Diffuse Reflectance Spectrasupporting

confidence: 75%

Synthesis, photoluminescence and Judd–Ofelt parameters of LiNa3P2O7:Eu3+ orthorhombic microstructures

et al. 2015

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“…2). The peak at 2359 cm -1 is attributed to the stretching and bending modes of physical adsorbed OH for the samples [23]. The mode at 583 cm -1 correspond to vibrations of TiO 6 [16,17].…”

Section: Infrared Spectra Of Nalati 2 Omentioning

confidence: 93%

“…5 D 3 ), 465 nm ( 7 F 0 ? 5 D 2 ), respectively [23]. The former broad band absorption should attribute to the charge transfer bands of the host lattice (TiO 6 8-group) [16,17].…”

Section: Luminescence Propertiesmentioning

confidence: 98%

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Photoluminescence properties of a novel red emitting NaLaTi2O6:Eu3+ phosphor

Zhang

et al. 2015

J Mater Sci: Mater Electron

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A novel red-emitting phosphor NaLaTi 2 O 6 : Eu 3? has been synthesized by a high-temperature solidstate reaction. X-ray powder diffraction analysis and FT-IR spectra confirmed the phase formation of NaLaTi 2 O 6 :Eu 3? materials. The photoluminescence excitation and emission spectra, the concentration dependence of the emission intensity, decay curves, and ultraviolet-visible absorption spectroscopy of the phosphor were investigated. The results showed that the phosphor could be efficiently excited by the near ultraviolet light region from 350 to 450 nm, and it exhibited red light emission. The decay time was also determined for various concentrations of Eu 3? in NaLaTi 2 O 6 . The calculated color coordinates lies in the red region. Therefore, these obtained results suggest that the prepared phosphors exhibit great potential for use as red emitting phosphor for near ultraviolet white light emitting diodes.

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“…Inorganic luminescent phosphors doped by rare-earth ions have been extensively used in various applications, such as plasma display panels (PDPs), field emission displays (FEDs), white-light emitting diodes (W-LEDs) and cathode ray tubes (CRTs) [1][2][3]. Among these inorganic crystalline materials, many reports focus on the rare earth and transition metal ions-doped phosphates on account of their favorable chemical stability, high absorption efficiency in n-UV region, and ease of synthesis in low annealing temperature [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Uniform KCaY(PO4)2:Eu3+ phosphors: sol–gel method, morphology and luminescence properties

Liang

Zhang

et al. 2015

J Mater Sci: Mater Electron

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Eu 3? doped KCaY(PO 4 ) 2 (KCYP) phosphors with irregular, hemispherical and spherical morphologies are successfully synthesized via a sol-gel method. The crystalline structure, morphology and luminescence properties of these phosphors are characterized by powder X-ray diffraction, scanning electron microscopy and photoluminescence spectroscopy. Under the excitation wavelength of near-ultraviolet (n-UV) 392 nm, the as-prepared KCYP:0.03Eu 3? phosphor exhibits an intense orange-red emission at 588 nm corresponding to 5 D 0 ? 7 F 1 transition of Eu 3? . The effect of synthesis conditions such as the dose of citric acid and pH of the precursor solution on the morphology and luminescence intensity of the phosphors is discussed in detail. The morphologies of KCYP:0.03Eu 3? phosphors vary from a small amount of spheres to aggregated hemispheres and then to smooth spheres by increasing the molar ratio of citric acid to metal ions in the host. The highest emission intensity can be obtained at the molar ratio of citric acid to metal ions 2:1 and pH = 8.0, respectively.

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A study of the luminescence in near UV-pumped red-emitting novel Eu3+-doped Ba3Ca3(PO4)4 phosphors for white light emitting diodes

Cited by 79 publications

References 46 publications

Synthesis, photoluminescence and Judd–Ofelt parameters of LiNa3P2O7:Eu3+ orthorhombic microstructures

Synthesis, photoluminescence and Judd–Ofelt parameters of LiNa3P2O7:Eu3+ orthorhombic microstructures

Photoluminescence properties of a novel red emitting NaLaTi2O6:Eu3+ phosphor

Uniform KCaY(PO4)2:Eu3+ phosphors: sol–gel method, morphology and luminescence properties

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