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

Kumam N, Singh NP, Singh LP, Srivastava SK - Nanoscale Res Lett (2015)

Bottom Line: The size of the nanoparticles for core (SrF2:3Dy) is found to increase when core is covered by shell (CaF2).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 abstract White light emitting homonanostructure material SrF2:3Dy@CaF2(core@shell).

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Manipur University, Imphal, 795003, India.

ABSTRACT
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 Dy(3+)-Dy(3+) 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 abstract White light emitting homonanostructure material SrF2:3Dy@CaF2(core@shell).

No MeSH data available.


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FTIR spectrum of SrF2, SrF2:3Dy and SrF2:3Dy@CaF2 nanoparticles
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Fig2: FTIR spectrum of SrF2, SrF2:3Dy and SrF2:3Dy@CaF2 nanoparticles

Mentions: Figure 2 shows the FTIR spectra of SrF2, SrF2:3Dy core and its shell with CaF2 nanoparticles at different ratios of shell component. FTIR spectra of ethylene glycol is attribute by O–H stretching and bending vibrations around 3300–3600 cm−1 and 1500–1600 cm−1; the broadening around 3300–3600 cm−1 is due to the O-H stretching vibration. Stretching vibration corresponds to C–O and C–C linkage appearing around 1000–1100 cm−1 and 1000–1200 cm−1, respectively. The C–C vibration is dominant over the C–O vibration. The peak around 2900 cm−1 has been corresponds to the C–H stretching vibrations [24]. The FTIR pattern of SrF2 nanoparticles shows the peak characterise of O–H, C–C, C–O and C–H indicating that the nanoparticles are capped by ethylene glycol molecule which was used as capping agent.Fig. 2


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

Kumam N, Singh NP, Singh LP, Srivastava SK - Nanoscale Res Lett (2015)

FTIR spectrum of SrF2, SrF2:3Dy and SrF2:3Dy@CaF2 nanoparticles
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4554543&req=5

Fig2: FTIR spectrum of SrF2, SrF2:3Dy and SrF2:3Dy@CaF2 nanoparticles
Mentions: Figure 2 shows the FTIR spectra of SrF2, SrF2:3Dy core and its shell with CaF2 nanoparticles at different ratios of shell component. FTIR spectra of ethylene glycol is attribute by O–H stretching and bending vibrations around 3300–3600 cm−1 and 1500–1600 cm−1; the broadening around 3300–3600 cm−1 is due to the O-H stretching vibration. Stretching vibration corresponds to C–O and C–C linkage appearing around 1000–1100 cm−1 and 1000–1200 cm−1, respectively. The C–C vibration is dominant over the C–O vibration. The peak around 2900 cm−1 has been corresponds to the C–H stretching vibrations [24]. The FTIR pattern of SrF2 nanoparticles shows the peak characterise of O–H, C–C, C–O and C–H indicating that the nanoparticles are capped by ethylene glycol molecule which was used as capping agent.Fig. 2

Bottom Line: The size of the nanoparticles for core (SrF2:3Dy) is found to increase when core is covered by shell (CaF2).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 abstract White light emitting homonanostructure material SrF2:3Dy@CaF2(core@shell).

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Manipur University, Imphal, 795003, India.

ABSTRACT
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 Dy(3+)-Dy(3+) 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 abstract White light emitting homonanostructure material SrF2:3Dy@CaF2(core@shell).

No MeSH data available.


Related in: MedlinePlus