Optical properties of long-lasting phosphorescent crystals Ce3+-doped Ca2Al2SiO7 and CaYAl3O7

Kodama, N; Tanii, Yoshifumi; Yamaga, M.

doi:10.1016/s0022-2313(99)00543-8

Cited by 91 publications

(44 citation statements)

References 8 publications

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“…Kodama has revealed that the Ce 3? doped Ca 2 Al 2 SiO 7 single crystal has a long afterglow emission and can be used in solid state laser materials [16].…”

Section: Introductionmentioning

confidence: 99%

Enhanced long-persistence of Ca2Al2SiO7:Ce3+ phosphors for mechanoluminescence and thermoluminescence dosimetry

Tiwari

Brahme

Sharma

et al. 2016

J Mater Sci: Mater Electron

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Ca 2 Al 2 SiO 7 phosphors having various concentration of Ce 3? were synthesized by combustion-assisted method at initiating temperature of 600°C, using urea as a fuel and its XRD, SEM, TEM and EDX were studied. X-ray diffraction (XRD) pattern indicates that the crystal structure of Ca 2 Al 2 SiO 7 is mainly tetragonal and particle size of prepared phosphor was determined by TEM. Scanning electron microscope (SEM) image was recorded to observe the surface morphology. Mechanoluminescence (ML) and thermoluminescence (TL) properties of Ca 2 Al 2 SiO 7 :Ce 3? phosphors was also investigated. The TL intensity of Ca 2 Al 2 SiO 7 :Ce 3? was recorded for different exposure time of c-irradiation and it was observed that TL intensity is maximum for c dose of 1180 Gy. The increase in TL intensity indicates that the concentration of traps increases with c exposure time. The peak of ML intensity versus time curve increases linearly with increasing impact velocity of the moving piston. The ML intensity increases by increasing c irradiation time up to 1180 Gy. The ML and TL spectra of Ca 2 Al 2 SiO 7 :Ce 3? phosphor exhibits a sharp emission at 400 nm wavelength due to transition of Ce 3? ions. Mechanism of TL and ML excitation and suitability of Ca 2 Al 2 SiO 7 :Ce 3? phosphor for radiation dosimetry have been discussed.

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“…Kodama has revealed that the Ce 3? doped Ca 2 Al 2 SiO 7 single crystal has a long afterglow emission and can be used in solid state laser materials [16].…”

Section: Introductionmentioning

confidence: 99%

Enhanced long-persistence of Ca2Al2SiO7:Ce3+ phosphors for mechanoluminescence and thermoluminescence dosimetry

Tiwari

Brahme

Sharma

et al. 2016

J Mater Sci: Mater Electron

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“…The persistent luminescence materials are inserted in this context with a wide variety of applications, such as emergency lighting [7] and even medical diagnostics [8,9]. The most studied persistent luminescence materials are doped with rare earth ions [10][11][12], but the rare earth precursors are now suffering from high prices and new alternatives are needed to comply with this problem.…”

Section: Introductionmentioning

confidence: 99%

Influence of titanium and lutetium on the persistent luminescence of ZrO_2

Carvalho¹,

Rodrigues²,

Hölsä³

et al. 2012

Opt. Mater. Express

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Non-doped as well as titanium and lutetium doped zirconia (ZrO 2 ) materials were synthesized via the sol-gel method and structurally characterized with X-ray powder diffraction. The addition of Ti in the zirconia lattice does not change the crystalline structure whilst the Lu doping introduces a small fraction of the tetragonal phase. The UV excitation results in a bright white-blue luminescence at ca. 500 nm for all the materials which emission could be assigned to the Ti 3+ e g  t 2g transition. The persistent luminescence originates from the same Ti 3+ center. The thermoluminescence data shows a well-defined though rather similar defect structures for all the zirconia materials. The kinetics of persistent luminescence was probed with the isothermal decay curve analyses which indicated significant retrapping. The short duration of persistent luminescence was attributed to the quasi-continuum distribution of the traps and to the possibility of shallow traps even below the room temperature. 1076-1078 (2000). 13. R. C. Garvie, R. H. Hannink, and R. T. Pascoe, "Ceramics steel," Nature 258(5537), 703-704 (1975)

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“…Recently, several groups in China found that Ce 3+ -Tb 3+ -or Eu 3+ /Eu 2+ -doped Ca 2 Al 2 SiO 7 materials can emit green, red, and blue light with high brightness under near UV irradiation, showing great advantages in fabricating the white light-emitting diode (w-LED) [10][11][12][13]. The Ca 2 Al 2 SiO 7 :Ce 3+ single crystal has a long afterglow emission and can be used in tunable solid-state laser materials [14][15][16]. As we all know, different material preparation methods have some important effects on material microstructure and physical properties.…”

Section: Introductionmentioning

confidence: 99%

Luminescence properties of red-emitting Ca2Al2SiO7:Eu3+ nanoparticles prepared by sol-gel method

2011

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A series of red-emitting Ca 2−x Al 2 SiO 7 :xEu 3+ (x = 1 mol.%-10 mol.%) phosphors were synthesized by the sol-gel method. The effects of annealing temperature and doping concentration on the crystal structure and luminescence properties of Ca 2 Al 2 SiO 7 :Eu 3+ phosphors were investigated. X-ray diffraction (XRD) profiles showed that all peaks could be attributed to the tetragonal Ca 2 Al 2 SiO 7 phase when the sample was annealed at 1000°C. Scanning electron microscopy (SEM) micrographs indicate that the phosphors have an irregularly rounded morphology with particles of about 200 nm. Excitation spectra showed that the strong broad band at around 258 nm and weak sharp lines in 350-490 nm were attributed to the charge transfer band of Eu 3+ −O 2− and f-f transitions within the 4f 6 configuration of Eu 3+ ions, respectively. Emission spectra implied that the red luminescence could be attributed to the transitions from the 5 D 0 excited level to the 7 F J (J = 0, 1, 2, 3, 4) levels of Eu 3+ ions with the main electric dipole transition 5 D 0 → 7 F 2 (618 and 620 nm), and Eu 3+ ions prefer to occupy a lower symmetry site in the crystal lattice. Moreover, the photoluminescence (PL) intensity was strongly dependent on both the sintering temperature and doping concentration, and the highest PL intensity was observed at an Eu 3+ concentration x = 7 mol.% after annealing at 1100°C. The obtained Ca 2 Al 2 SiO 7 :Eu 3+ phosphor may have potential application for the red lamp phosphor.

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Optical properties of long-lasting phosphorescent crystals Ce3+-doped Ca2Al2SiO7 and CaYAl3O7

Cited by 91 publications

References 8 publications

Enhanced long-persistence of Ca2Al2SiO7:Ce3+ phosphors for mechanoluminescence and thermoluminescence dosimetry

Enhanced long-persistence of Ca2Al2SiO7:Ce3+ phosphors for mechanoluminescence and thermoluminescence dosimetry

Influence of titanium and lutetium on the persistent luminescence of ZrO_2

Luminescence properties of red-emitting Ca2Al2SiO7:Eu3+ nanoparticles prepared by sol-gel method

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