Calculation of the Light Scattering Function for Small Polyhedric Particles

Fukuda, M.

doi:10.1515/9780824884918-011

Cited by 8 publications

(10 citation statements)

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“…As shown in figure 2, the position of the C2 band is rather nearer the C3 band than the C1 band at low temperatures, but it shifts towards the C1 with increasing temperahre and locates at the middle of the C1 and C3 bands. Such behaviour has never been observed in the Sriz+, PbZ+, Ga+, In+ and TI+ centres (Fukuda 1964(Fukuda , 1969; the CZ band locates in just the middle of the C1 and C3 bands in these s2 centres even if the temperature is changed. Figure 3 shows the temperature dependence of the distance between the C1 and CZ band peaks and the distance between the C, and C3 band peaks.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 93%

Optical absorption of the off-centred Ge²⁺ions in KCl and KBr crystals

Tsuboi

Kamewari

1994

J. Phys.: Condens. Matter

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Optical absorption spectra of Ge* ions in KCI and KBr crysMs have been investigated in h temperature m g e IS-300 K. In the uiplet-suUetured spin-orbit-allowed C band, the C1-G band spiilting was observed to be larger than that of the C Z -C ~ band at low tempemtures. while the W O become equal to each other with increasing temperature. The absorption lieshape has been calculated, by means of the Monte Carlo integration method, for G$+ ions with a h e a r electron-lattice interaction and tetragonal crystal field. Comparing the calculated lineshape with the observed spectra, we conclude that the Gel+ ion is at the off-centre position with the tewgonal field at low temperatures, but is moved into the onbenee position with increasing temperature.

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Section: Experimental Procedures and Resultsmentioning

confidence: 93%

Optical absorption of the off-centred Ge²⁺ions in KCl and KBr crystals

Tsuboi

Kamewari

1994

J. Phys.: Condens. Matter

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“…Unlike the case of a monovalent-ion (like Ga + , In + , and Tl + ) doping, 6 a charge-compensating cation vacancy (V − C ) has to be taken into account in the case of divalent-ion (e.g., Zn 2+ , Mg 2+ , and Sn 2+ ) doping into alkali halides. [7][8][9] For example, Sn 2+ ion doped in KCl is usually associated with potassium vacancy (V − K ), which is located in the nearest-neighbor or nextnearest-neighbor K (potassium) site with respect to the Sn…”

Section: Resultsmentioning

confidence: 99%

Effects of Ce Concentration and Temperature on Photoluminescence Intensity in KCl:Ce³⁺Blue Phosphor

Tosaka

Adachi

2013

ECS J. Solid State Sci. Technol.

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Ce3+ ion is an important activator for various phosphors, but no detailed study has been performed on KCl:Ce3+. A Ce3+-doped KCl blue phosphor is synthesized from an aqueous solution of KCl − CeCl3. The structural and optical properties of the KCl:Ce3+ phosphor are investigated by X-ray diffraction (XRD) analysis, photoluminescence (PL) analysis, PL excitation spectroscopy, diffuse reflectance spectroscopy, and luminescence decay measurement. The XRD data indicate that the KCl host lattice can be expanded when Ce atoms are incorporated. The phosphor exhibits a blue emission doublet at ∼400 nm, which is characteristic of the 5d → 4f transitions in Ce3+. The dependence of the PL intensity on the Ce3+ concentration up to 23 mol% and that on the lattice temperature in the T = 20 − 450 K range are measured and analyzed in detail. An increase in the luminescence decay time with increasing emission wavelength is also observed.

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“…These absorption peaks have doublet (A), singlet (B), and triplet structures (C). 1,2 The energies of the A, B, and C absorption peaks are usually dependent on the metal and are typically modified by the host matrix material. Mȃrculescu et al 32 measured the PLE spectrum of a NaCl:Sn 2+ system at 80 K, and the obtained results, with the only exception of a slight blue-shift for each peak, were similar to those reported herein.…”

Section: Resultsmentioning

confidence: 99%

“…Alkali halide phosphors that contain heavy-metal ions with an s 2 configuration have received a great deal of attention both from theoretical and experimental point of views. [1][2][3][4][5][6][7][8] A considerable number of studies have reported the photoluminescence (PL) properties of Sn 2+activated alkali halides (such as KCl:Sn 2+ , [9][10][11][12][13] KBr:Sn 2+ , 10,[14][15][16][17] and KI:Sn 2+ , 14,[18][19][20][21][22][23][24][25][26][27][28][29] ) and other phosphors. 30 However, complete studies on the PL properties of Sn 2+ -activated NaCl phosphors are scarce in the literature.…”

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confidence: 99%

Optical Properties of NaCl:Sn²⁺Phosphor Synthesized from Aqueous NaCl/SnCl₂/HCl Solution

Kondo

Adachi

2012

ECS J. Solid State Sci. Technol.

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A NaCl:Sn 2+ phosphor was synthesized from an aqueous NaCl/SnCl 2 /HCl solution. The optical properties of the as-synthesized phosphor material were investigated by diffuse reflectance spectroscopy, photoluminescence (PL) analysis, PL excitation (PLE) spectroscopy, and luminescence decay time measurement. The effects of temperature and excitation wavelength on the emission spectra were thoroughly studied in the present study. The temperature dependence of the PL spectra was examined between T = 20 and 300 K in 10 K increments, while the PLE spectra were obtained by excitation with λ ex ∼ 250-330 nm in the same temperature range. The PL spectra revealed four independent emission bands with peaks at ∼440 nm (B1), ∼490 nm (B2), ∼540 nm (G), and ∼635 nm (R). The B1 and G emission bands were assigned to the A T and A X emission bands typically observed in ns 2 -doped alkali halide phosphors, whereas the B2 and R emission bands were attributed to the Sn 2+ − V − Na (cation vacancy) dipole aggregates.Alkali halide phosphors that contain heavy-metal ions with an s 2 configuration have received a great deal of attention both from theoretical and experimental point of views. 1-8 A considerable number of studies have reported the photoluminescence (PL) properties of Sn 2+ -activated alkali halides (such as KCl:Sn 2+ , [9][10][11][12][13] KBr:Sn 2+ , 10,14-17 and KI:Sn 2+ , 14,18-29 ) and other phosphors. 30 However, complete studies on the PL properties of Sn 2+ -activated NaCl phosphors are scarce in the literature. [31][32][33] Kynev and Tabakova 31 studied the effects of divalent cation additives (Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ , Zn 2+ , and Cd 2+ ) on the PL and PL excitation (PLE) properties of NaCl:Sn 2+ phosphor. The addition of such divalent cations along with the Sn 2+ activator caused significant changes in both the PL and PLE properties of the phosphor. The divalent cations could be divided into two groups on the basis of the effects they produce. The first group of cations (Zn 2+ , Cd 2+ , and Mg 2+ ) produced new, shorter-wavelength emission bands located at ∼440-465 nm along with long-wavelength emission bands in the 520-530 nm region. Interestingly, the emission band at ∼490 nm, which is a characteristic of NaCl:Sn 2+ , was no longer present after addition of these cations. The second group of cations (Ca 2+ , Ba 2+ , and Sr 2+ ) caused a redshift in the ∼490 nm emission band together with an appreciable increase in its spectral width.Mȃrculescu et al. 32 investigated the PL and PLE properties of a Bridgman-grown NaCl:Sn 2+ phosphor with particular emphasis on the effects of concentration and thermal history of the crystals. The aggregation centers formed in NaCl:Sn 2+ showed absorption and emission bands different from those of isolated Sn 2+ − V − Na (cation vacancy) dipoles. PL properties of Sn 2+ -sensitized Mn 2+ centers in NaCl were also investigated by Muñoz F. and Rubio O. 33 Thermoluminescence (TL) emission and decay kinetics of Sn 2+ -doped NaCl were studied by Acharya et al. 34 They reported that th...

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Calculation of the Light Scattering Function for Small Polyhedric Particles

Cited by 8 publications

References 0 publications

Optical absorption of the off-centred Ge²⁺ions in KCl and KBr crystals

Optical absorption of the off-centred Ge²⁺ions in KCl and KBr crystals

Effects of Ce Concentration and Temperature on Photoluminescence Intensity in KCl:Ce³⁺Blue Phosphor

Optical Properties of NaCl:Sn²⁺Phosphor Synthesized from Aqueous NaCl/SnCl₂/HCl Solution

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Calculation of the Light Scattering Function for Small Polyhedric Particles

Cited by 8 publications

References 0 publications

Optical absorption of the off-centred Ge2+ions in KCl and KBr crystals

Optical absorption of the off-centred Ge2+ions in KCl and KBr crystals

Effects of Ce Concentration and Temperature on Photoluminescence Intensity in KCl:Ce3+Blue Phosphor

Optical Properties of NaCl:Sn2+Phosphor Synthesized from Aqueous NaCl/SnCl2/HCl Solution

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Optical absorption of the off-centred Ge²⁺ions in KCl and KBr crystals

Optical absorption of the off-centred Ge²⁺ions in KCl and KBr crystals

Effects of Ce Concentration and Temperature on Photoluminescence Intensity in KCl:Ce³⁺Blue Phosphor

Optical Properties of NaCl:Sn²⁺Phosphor Synthesized from Aqueous NaCl/SnCl₂/HCl Solution