1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Optical properties of KCl:Sn2+ phosphors synthesized from aqueous KCl/SnCl2 solutions
Rent:
Rent this article for
USD
10.1063/1.3664916
/content/aip/journal/jap/110/11/10.1063/1.3664916
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/11/10.1063/1.3664916
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) XRD patterns of phosphor powders synthesized in aqueous solutions of KCl : SnCl2 = 1 : M with molar ratios of (a) M = 0.1, (b) 0.5, (c) 1, and (d) 5, measured in the θ–2θ scan mode. The ASTM card pattern of a cubic KCl lattice (space group = Fm3m) is shown in the lower part of (a).

Image of FIG. 2.
FIG. 2.

SEM photoimages of the phosphors synthesized with (a) M = 0.1 and (b) 5.

Image of FIG. 3.
FIG. 3.

EPMA traces of the phosphors synthesized with (a) M = 0.1 and (b) 5.

Image of FIG. 4.
FIG. 4.

(Color online) Room-temperature PL spectra of the phosphors synthesized with M from 0 (pure KCl) to 5. The PL spectra were measured using a Nd:YAG laser (λex = 266 nm) as the excitation light source. For comparison, the PL spectrum of a melt-grown KCl:Sn2+ crystal at 300 K is shown by the dashed line (Ref. 15).

Image of FIG. 5.
FIG. 5.

(Color online) Temperature dependence of PL spectra for the phosphors synthesized with (a) M = 0.1 and (b) 5. The PL spectra were measured using a Nd:YAG laser (λex = 266 nm) as the excitation light source at temperatures T = 20–300 K in increments of 20 K. For comparison, the PL spectrum of SnCl2 powder measured at 20 K is shown in (b) by the dashed line (Ref. 51).

Image of FIG. 6.
FIG. 6.

PL spectra of the phosphors synthesized with (a) M = 0.1 and (b) 5 and measured at 20 and 300 K. The dashed lines represent the result of deconvoluting the broadband into two peaks, A T and R. The solid line shows the sum of these two peaks.

Image of FIG. 7.
FIG. 7.

Integrated A T and R emission intensity I PL vs 1/T for KCl:Sn2+ phosphor (M = 0.1) at temperatures T = 20 – 300 K in increments of 10 K. The I PL values were obtained by decomposing the spectrum into two individual components (A T and R). The solid lines were calculated using Eq. (1) with E q 1 = 25 meV and E q 2 = 140 meV. The dashed line was calculated using Eq. (1) without taking into account the i = 1 term (E q 1 = 25 meV) in the A T emission process.

Image of FIG. 8.
FIG. 8.

(Color online) PLE spectra of KCl:Sn2+ phosphor (M = 0.1) measured at temperatures T = 20 – 300 K by monitoring at the wavelength of the A T emission band. For comparison, the optical absorption spectrum (α) of KCl:Sn2+ measured at 300 K by Fukuda et al. (Ref. 47) is shown in the lower part of the figure.

Image of FIG. 9.
FIG. 9.

(Color online) PLE spectra of KCl:Sn2+ phosphor (M = 0.1) measured at 300 K by monitoring at the wavelengths of the (a) A T and (b) R emission bands. The dashed lines in (a) represent the result of deconvoluting the PLE spectrum into six peaks:1 S 03 P 1 (A 1 and A 2),1 S 03 P 2 (B), and1 S 01 P 1 (C1 - C3) (Refs. 3 and 4). The PLE spectrum of the phosphor synthesized with M = 5 measured at 20 K is also shown in (b).

Image of FIG. 10.
FIG. 10.

PL decay curves of KCl:Sn2+ phosphor (M = 0.1) measured at (a) 20 and (b) 300 K by monitoring at the wavelengths of the A T and R emission bands. The solid lines show the results calculated using Eq. (2) with i = 1 and 2 (double exponential equation).

Image of FIG. 11.
FIG. 11.

(Color online) Fast and slow lifetimes vs 1/T for the (a) A T and (b) R emission bands in KCl:Sn2+ phosphor (M = 0.1). The solid lines show the results calculated using Eq. (4) with E q 1 = 25 meV and E q 2 = 140 meV.

Image of FIG. 12.
FIG. 12.

(Color online) PL spectra of KCl:Sn2+ phosphors (M = 0.1) measured by excitation at 266 nm (Nd:YAG laser) at 300 K. The sample was as-synthesized or annealed at 400 °C for 1 min. The vertical bars represent the Poisson distribution given by Eq. (6) with S = 14. The ZPL energy determined here is E ZPL = 3.311 eV.

Image of FIG. 13.
FIG. 13.

PL decay curves of (a) as-synthesized KCl:Sn2+ (M = 0.1) and (b) KCl:Sn2+ (M = 0.1) annealed at 400 °C for 1 min. The decay curves were measured at 300 K by monitoring at the wavelength of the A T emission band. The solid lines show the results calculated using Eq. (2) with (a) i = 1 and 2 (double exponential equation) and (b) i = 1 only (single exponential equation). The slopes of the dashed lines in (a) give the fast (∼1.7 μs) and slow (∼5.4 μs) decay times.

Image of FIG. 14.
FIG. 14.

(Color online) PL decay curves of the phosphor synthesized with M = 5. The decay curves were measured at 300 K by monitoring at the wavelengths of the A T and R emission bands. The solid lines show the results calculated using Eq. (2) with (a) i = 1 and 2 (double exponential equation). The inset shows the corresponding PL spectrum.

Loading

Article metrics loading...

/content/aip/journal/jap/110/11/10.1063/1.3664916
2011-12-05
2014-04-16
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical properties of KCl:Sn2+ phosphors synthesized from aqueous KCl/SnCl2 solutions
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/11/10.1063/1.3664916
10.1063/1.3664916
SEARCH_EXPAND_ITEM