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Disappearance and recovery of luminescence in GdPO4:Eu3+ nanorods: Propose to water/OH release under near infrared and gamma irradiations
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10.1063/1.4731644
/content/aip/journal/jap/112/1/10.1063/1.4731644
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/1/10.1063/1.4731644

Figures

Image of FIG. 1.
FIG. 1.

XRD patterns of as-prepared and annealed Eu0.05Gd0.95PO4 prepared in (a) H2O and (b) EG mediums.

Image of FIG. 2.
FIG. 2.

TGA and DSC curves of as-prepared Eu0.05Gd0.95PO4 prepared in (a) H2O and (b) EG mediums.

Image of FIG. 3.
FIG. 3.

FTIR spectra of (a) as-prepared pure GdPO4 in H2O and EG mediums and (b) as-prepared GdPO4 in H2O medium along with its annealed samples. FTIR spectrum of D2O (95%) is included in (a).

Image of FIG. 4.
FIG. 4.

Photos of cuvettes containing Eu0.05Gd0.95PO4 prepared in EG medium dispersed in (a) water, (b) ethanol and prepared in H2O medium dispersed in (c) water, (d) ethanol.

Image of FIG. 5.
FIG. 5.

Raman spectra of as-prepared pure GdPO4 prepared in (a) H2O and (b) EG mediums and their 900 °C annealed samples.

Image of FIG. 6.
FIG. 6.

TEM images of Eu0.05Gd0.95PO4 prepared in H2O medium: (a) as-prepared, (d) 500, and (e) 900 °C heated samples. (b) HRTEM image of as-prepared sample showing its lattice spacing and (c) its FFT pattern. Insets: (1) magnified TEM image of as-prepared sample and (2) its SAED pattern.

Image of FIG. 7.
FIG. 7.

TEM images of Eu0.05Gd0.95PO4 prepared in EG medium: (a) as-prepared, (d) 500, and (e) 900 °C heated samples. (b) HRTEM image of as-prepared sample showing lattice spacing and (c) its IFFT pattern. Inset: (1) magnified TEM image of as-prepared sample and (2) its SAED. SAED patterns (3) of 500 and (4) of 900 °C heated samples.

Image of FIG. 8.
FIG. 8.

SEM images of as-prepared Eu0.05Gd0.95PO4 in (a) H2O and (b) EG mediums and (c) EDX spectrum of the sample prepared in EG-medium.

Image of FIG. 9.
FIG. 9.

Excitation spectra of as-prepared Eu x Gd1− x PO4 (x = 2, 5, 7, and 10 at.%) in EG medium with a monitoring emission at 592 nm.

Image of FIG. 10.
FIG. 10.

Emission spectra of (a) as-prepared Eu0.05Gd0.95PO4 in EG medium after different excitation wavelengths, Eu x Gd1− x PO4 (x = 2, 5, 7 and 10 at. %) prepared in (b) EG and (c) H2O mediums after excitation at 250 nm.

Image of FIG. 11.
FIG. 11.

Emission spectra of as-prepared Eu0.05Gd0.95PO4 in (a) EG and (b) H2O mediums along with their annealed samples after excitation at 250 nm.

Image of FIG. 12.
FIG. 12.

Emission spectra of as-prepared Eu0.05Gd0.95PO4 in H2O and D2O mediums after excitation at 250 nm.

Image of FIG. 13.
FIG. 13.

Luminescence intensity vs. time for 5 D 0 level of Eu3+ for as-prepared Eu0.05Gd0.95PO4 in (a) H2O and (b) EG mediums along with their 900 °C annealed samples.

Image of FIG. 14.
FIG. 14.

Emission spectra of (a) as-prepared Eu0.1Gd0.9PO4 core in EG and its core-shell (Eu0.1Gd0.9PO4:GdPO4) and (b) Eu0.1Gd0.9PO4:GdPO4 (core-shell) and its 900 °C annealed counterpart after excitation at 250 nm.

Image of FIG. 15.
FIG. 15.

New approach for generation of water molecules using laser NIR light and its uses to the killing of mass cells/malignant tumor under γ-ray irradiation.

Image of FIG. 16.
FIG. 16.

M vs. H of GdPO4 prepared in EG medium.

Tables

Generic image for table
Table I.

Lattice parameters (a, b, c, Å) and angle (β, °), unit cell volume (V, Å3), and crystallite size (t, nm) of Eu x Gd1− x PO4 (x = 0–30 at. %) prepared in H2O medium and annealed Eu0.05Gd0.95PO4 along with JCPDS card Nos. 39-0232, 32-0386, and 20-1044. Monoclinic and hexagonal phases are represented by “m” and “h,” respectively. As-prepared is represented as “as-prep.” Strain developed in the lattice is represented by “η.”

Generic image for table
Table II.

Lattice parameters (a, b, c, Å) and angle (β, °), unit cell volume (V, Å3), and crystallite size (t, nm) of Eu x Gd1− x PO4 (x = 0–30 at. %) prepared in EG medium and annealed Eu0.05Gd0.95PO4 along with JCPDS card Nos. 39-0232. Monoclinic phase is represented by “m.” As-prepared is represented as “as-prep.” Strain developed in the lattice is represented by “η.”

Generic image for table
Table III.

IR peaks assignment of as-prepared GdPO4 in EG and H2O mediums and annealed samples of as-prepared GdPO4 in H2O medium (cm−1).

Generic image for table
Table IV.

Raman peaks assignment of pure as-prepared GdPO4 in H2O and EG mediums and their annealed samples (cm−1).

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/content/aip/journal/jap/112/1/10.1063/1.4731644
2012-07-03
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Disappearance and recovery of luminescence in GdPO4:Eu3+ nanorods: Propose to water/OH• release under near infrared and gamma irradiations
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/1/10.1063/1.4731644
10.1063/1.4731644
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