Valencies of Eu in CaS:Eu, La

Choi, Han Seul; Kim, Chang Hong; Pyun, Chong Hong; Kim, Sung Jin

doi:10.1006/jssc.1998.7766

Cited by 26 publications

(7 citation statements)

References 16 publications

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“…The fact that more than one emission centre is usually associated with the nature of emission, makes it difficult to interpret the spectra of these phosphors. Various researchers have been working on luminescence lifetime shortening of sulphide phosphors by reducing the particle size to a few nanometres [11][12][13][14][15][16][17]. The analysis of photoluminescence decays reveals valuable information about the 'centre' chemistry of the luminescence and trap-depths.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photoluminescence decay processes of doped CaS phosphors at low temperature

Bhatti

Sharma

Verma

2006

Journal of Modern Optics

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CaS phosphor samples singly doped with Mn impurity and doubly doped withMn and X (X¼ Fe, Co and Ni) have been synthesized using a flux method. Crystal structure and phase identification of doped CaS phosphors have been carried out by X-ray diffraction (XRD) studies. A pulse excitation method has been employed to study the optical parameters of the doped phosphors. Excited state lifetime measurements at liquid nitrogen temperature were carried out with a pulsed UV laser (nitrogen laser) as the excitation source has a short pulse width (10 ns) and high peak power (200 kW per pulse). The results have been compared with room temperature lifetime studies. Enhancement in photoluminescence intensity and lifetime shortening in these synthesized doped phosphors is reported at low temperature. The lifetime values have been found to be in the microsecond time domain for CaS:Mn phosphors while on addition of a quencher impurity Ni to CaS:Mn phosphors, the lifetime values reduce to the nanosecond time domain at 77 K temperature. A thermally activated carrier transfer model has been proposed to explain the observed abnormal temperature behaviour of emission from CaS:Mn, X-doped phosphors.

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Section: Introductionmentioning

confidence: 99%

Enhanced photoluminescence decay processes of doped CaS phosphors at low temperature

Bhatti

Sharma

Verma

2006

Journal of Modern Optics

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“…At room temperature, there is no EPR signal for Eu 3+ and Ti 4+ ions, while an EPR signal for Eu 2+ and Ti 3+ ions can be observed [15][16][17][18][19]. So, Eu 2+ and Ti 3+ ions can be detected by EPR.…”

Section: Resultsmentioning

confidence: 88%

High pressure and high temperature synthesis and characterization of a new mixed valence perovskite oxide Eu0.62K0.38TiO3

Miao

Lü

Sui

et al. 2005

Journal of Alloys and Compounds

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“…The red material based on sulfide (CaS:Eu 3+ ) has nearly 3 h afterglow. However, it is extremely sensitive to moisture and thus chemically unstable [6]. The Pr 3+ -doped CaTiO 3 phosphor is a stable material, but its afterglow time is short [7].…”

Section: Introductionmentioning

confidence: 99%

Effects of Gd3+ and Lu3+ co-doping on the long afterglow properties of yellowish-orange phosphor Y2O2S:Ti4+, Mg2+

Wang

Zhang

Huang

et al. 2009

Journal of Luminescence

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Valencies of Eu in CaS:Eu, La

Cited by 26 publications

References 16 publications

Enhanced photoluminescence decay processes of doped CaS phosphors at low temperature

Enhanced photoluminescence decay processes of doped CaS phosphors at low temperature

High pressure and high temperature synthesis and characterization of a new mixed valence perovskite oxide Eu0.62K0.38TiO3

Effects of Gd3+ and Lu3+ co-doping on the long afterglow properties of yellowish-orange phosphor Y2O2S:Ti4+, Mg2+

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