Inelastic Light Scattering of Divalent Ions (Ca2+, Sr2+ and Ba2+) Substituted (Na1/2Bi1/2)TiO3 Single Crystals

Ohta, Ryu; Onda, Yousuke; Kojima, Seiji; Tsukada, Shinya

doi:10.3938/jkps.59.2471

Cited by 4 publications

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“…From the Table 1, we observed that the unit cell volumes of the SrF 2 :3Dy is larger than SrF 2 this can be explained as follows. The ionic radii of the Sr 2+ (r Sr 2+ = 1.27 Å) [21] is larger than the size of Dy 3+ ( r Dy 3+ = 1.03 Å) [22], and according to Vegard’s law, incorporation of Dy 3+ ion in SrF 2 results in shrinking of unit cell volume as compared to the standard data (JCPDS No. 01-1274).…”

Section: Resultsmentioning

confidence: 99%

Enhancement of luminescence in white emitting strontium fluoride core @ calcium fluoride shell nanoparticles

Kumam

Singh

et al. 2015

Nanoscale Res Lett

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Synthesis of lanthanide-doped fluoride SrF2:3Dy and SrF2:3Dy@CaF2 nanoparticles with different ratios of core to shell (1:0.5, 1:1 and 1:2) has been carried out by employing ethylene glycol route. X-ray diffraction (XRD) patterns reveal that the structure of the prepared nanoparticles was of cubical shape, which is also evident in TEM images. The size of the nanoparticles for core (SrF2:3Dy) is found to increase when core is covered by shell (CaF2). It is also evident from Fourier transform infrared spectroscopy (FTIR) that ethylene glycol successfully controls the growth and acts as a shape modifier by regulating growth rate. In the photoluminescence investigation, emission spectra of SrF2:3Dy is found to be highly enhanced when SrF2:3Dy is covered by CaF2 due to the decrease of cross relaxation amongst the Dy3+-Dy3+ ions. Such type of enhancement of luminescence in homonanostructure SrF2:3Dy@CaF2 (core@shell) has not been studied so far, to the best of the authors’ knowledge. This luminescent material exhibits prominently white light emitting properties as shown by the Commission Internationale d’Eclairage (CIE) chromaticity diagram. The calculated correlate colour temperature (CCT) values for SrF2:3Dy, SrF2:3Dy@CaF2 (1:0.05), SrF2:3Dy@CaF2 (1:1) and SrF2:3Dy@CaF2 (1:2) are 5475, 5476, 5384 and 5525 K, respectively, which lie in the cold white region.Graphical abstractWhite light emitting homonanostructure material SrF2:3Dy@CaF2(core@shell).

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Section: Resultsmentioning

confidence: 99%