Luminescence properties of long-persistence silicate phosphors

Ito, Yutaka; Komeno, Akira; Uematsu, Kazuyoshi; Toda, Kenji; Sato, Mineo

doi:10.1016/j.jallcom.2005.01.132

Cited by 31 publications

(15 citation statements)

References 13 publications

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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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Section: Introductionmentioning

confidence: 99%

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

2011

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“…Compared with sulfide and aluminate hosts, silicate system is an excellent luminescent host with a stable crystal structure and high thermal stability. Many studies on phosphors with silicate as a host have been conducted [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Sol–gel synthesis and luminescence properties of CdSiO3: Mn2+, Eu3+ phosphor

Cao

Liu

et al. 2012

Journal of Alloys and Compounds

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“…Crystalline and optical characterization were reported, where broad emission is observed in UV and visible ranges [16], e.g., Ca 2 Al 2 SiO 7 :Ce at 410 nm (1-10 3 s) [17], and mechanisms of storing and releasing optical energy is examined in order to obtain phosphors with strong intensities and long persistent times [18]. New strontium alumino-silicates showed that the main emission is at an UV area, e.g., Sr 2 Al 2 SiO 7 :Ce (387 nm), and Ca 0.5 Sr 1.5 Al 2 SiO 7 :Ce,Tb (386 nm); these are first examples of a white long afterglow from single phosphor matrixes [19,20]. The fluorescence of (Ca 0.98−x Sr x )Al 2 Si 2 O 8 :Eu 0.01 ,Dy 0.01 shifts from blue to purple (440-406 nm), and its afterglow intensity can be enhanced with an increase of Sr 2+ concentration [21].…”

Section: Introductionmentioning

confidence: 99%