Cathodoluminescence of Alkaline Earth Thiosilicate Phosphors

Avella, Frank J.

doi:10.1149/1.2407852

Cited by 10 publications

(14 citation statements)

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“…For this phosphor it was argued that Eu substitution on the two different Ca sites in the host lattice gives two distinct emission bands, at about 560 and 650 nm, with the relative intensity of both bands depending on the Eu 2+ concentration. Although the emission band at longer wavelengths was related by Avella to trace amounts of CaS:Eu 2+ [15], we argued that it could be related to the pres- ence of two different lattice sites in Ca 2 SiS 4 [10]. From the fact that the emission spectrum of Ca 2 SiS 4 :Ce 3+ changes when varying the excitation wavelength and dopant concentration, it can be derived that also for Ce 3+ more than one emission centre is active.…”

Section: Photoluminescence Of Ca 2 Sis 4 :Ce 3+mentioning

confidence: 73%

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Using rare earth doped thiosilicate phosphors in white light emitting LEDs: Towards low colour temperature and high colour rendering

Smet

Korthout

Haecke

et al. 2008

Materials Science and Engineering: B

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Section: Photoluminescence Of Ca 2 Sis 4 :Ce 3+mentioning

confidence: 73%

“…As no detailed information is available in literature on the emission properties of Ca 2 SiS 4 :Ce 3+ , its luminescence was investigated as a function of the Ce 3+ concentration. Avella did not show emission spectra but reported the cathodoluminescence efficiency to be low [15]. Fig.…”

Section: Photoluminescence Of Ca 2 Sis 4 :Ce 3+mentioning

confidence: 92%

Using rare earth doped thiosilicate phosphors in white light emitting LEDs: Towards low colour temperature and high colour rendering

Smet

Korthout

Haecke

et al. 2008

Materials Science and Engineering: B

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“…Beside structural characterization of Ca 2 SiS 4 (space group P nma , orthorhombic [15]) and Eu 2 SiS 4 (space group P2 1 /m, monoclinic [16]), the luminescent properties of Ca 2 SiS 4 :Eu have been explored only briefly. Avella reported that the cathodoluminescence is characterized by an emission peak at 563 nm [14]. A second emission band peaking at 660 nm was also observed, and tentatively assigned to the presence of CaS:Eu in the synthesized powder.…”

Section: Introductionmentioning

confidence: 75%

Structure and photoluminescence of (Ca,Eu)₂SiS₄powders

Smet

Avci²,

Loos³

et al. 2007

J. Phys.: Condens. Matter

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The photoluminescence of Ca(2)SiS(4):Eu powders was investigated in detail as a function of europium concentration (from 0.1% Ca substitution to the fully substituted Eu(2)SiS(4)). At low europium dopant concentration (<10%) the powders crystallize in an orthorhombic structure and the emission spectrum is dominated by two broad emission bands, at 564 and 660 nm. The emission can be tuned from yellow (CIE x = 0.46,y = 0.53) to red (CIE x = 0.65,y = 0.35) by variation of the Eu concentration. An energetic coupling exists between both bands, leading to a broad excitation wavelength range. Powders with high europium concentration (>40%) crystallize in a monoclinic structure, details of which were determined by Rietveld refinement of x-ray diffraction data. For the composition CaEuSiS(4) (i.e. 50% substitution), the luminescence peaks at 614 nm, shifting to shorter wavelengths upon further substitution of Ca by Eu. Although considerable thermal quenching is present at room temperature in the fully Eu-substituted compound, Eu(2)SiS(4) is still photoluminescent, with a peak emission wavelength of 577 nm. A strong correlation is found between the crystallographic and luminescent properties of the (Ca,Eu)(2)SiS(4) powders. The broad emission and excitation bands make this phosphor a good candidate for use in phosphor-converted light-emitting diodes (pcLEDs).

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“…These values are in line with the measurements reported by Avella. Avella studied the cathodoluminescence of Sr

_{2}

SiS

_{4}

:Ce

^{3 +}

and reported the intensity to be weak [26]. In photoluminescence, however, for sufficiently low concentrations (less than 1%) and excited with light of 400 nm, the phosphor shows a bright emission intensity.…”

Section: Resultsmentioning

confidence: 99%

Broadband Luminescence in Rare Earth Doped Sr2SiS4: Relating Energy Levels of Ce3+ and Eu2+

2013

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Sr2SiS4:Ce3+ is an efficient blue-emitting (460 nm) phosphor, excitable with light of wavelengths up to 420 nm. From the excitation spectrum, we construct the energy level scheme and use it to check the predictive power of the Dorenbos model, relating the positions of the Ce3+ energy levels with those of Eu2+ in the same host. For strontium thiosilicate, this method gives excellent results and allows us to determine which of two available crystallographic sites is occupied by cerium. We use the Dorenbos method for extracting information on the coordination of Ce3+ from the observed crystal field splitting.

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Cathodoluminescence of Alkaline Earth Thiosilicate Phosphors

Abstract: not Available.

Cited by 10 publications

References 0 publications

Using rare earth doped thiosilicate phosphors in white light emitting LEDs: Towards low colour temperature and high colour rendering

Using rare earth doped thiosilicate phosphors in white light emitting LEDs: Towards low colour temperature and high colour rendering

Structure and photoluminescence of (Ca,Eu)₂SiS₄powders

Broadband Luminescence in Rare Earth Doped Sr2SiS4: Relating Energy Levels of Ce3+ and Eu2+

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Cathodoluminescence of Alkaline Earth Thiosilicate Phosphors

Abstract: not Available.

Cited by 10 publications

References 0 publications

Using rare earth doped thiosilicate phosphors in white light emitting LEDs: Towards low colour temperature and high colour rendering

Using rare earth doped thiosilicate phosphors in white light emitting LEDs: Towards low colour temperature and high colour rendering

Structure and photoluminescence of (Ca,Eu)2SiS4powders

Broadband Luminescence in Rare Earth Doped Sr2SiS4: Relating Energy Levels of Ce3+ and Eu2+

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Structure and photoluminescence of (Ca,Eu)₂SiS₄powders