Combustion synthesis of Sr3MgSi2O8:Eu2+ and Sr2MgSi2O7:Eu2+ phosphors

Talwar, Gurjeet; Joshi, C.; Moharil, S. V.; Dhopte, S.M.; Muthal, P. L.; Kondawar, V. K.

doi:10.1016/j.jlumin.2009.06.006

Cited by 37 publications

(17 citation statements)

References 14 publications

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“…The corresponding energy levels of Ca 2 MgSi 2 O 7 :Eu 2+ ,Ce 3+ with optical transitions and ET processes are shown in Figure . When Ce 3+ first absorbs UV irradiation (250–350 nm), an electron is pumped to the 5d level, and then non‐radiatively relaxes to the lowest component of the 5d level, finally decaying to the 2 F 5/2 and 2 F 7/2 levels by a radiative process and emitting photons (373, 393 nm) . Because the value of the energy level of the excited 5d state of Ce 3+ is close to the 4f 6 5d 1 levels of Eu 2+ ions, it is highly possible that ET from Ce 3+ to Eu 2+ ions occurs, promoting it from the 4f 7 ( 8 S 7/2 ) ground state to the 4f 6 5d 1 levels.…”

Section: Resultsmentioning

confidence: 99%

Retracted: Studies on the luminescence properties of cerium co‐doping on Ca₂MgSi₂O₇:Eu²⁺ phosphor by solid‐state reaction method

et al. 2017

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Ca2MgSi2O7:Ce3+, Ca2MgSi2O7:Eu2+ and Ca2MgSi2O7:Eu2+,Ce3+ phosphors were prepared using the solid‐state reaction method. The crystal structures of the sintered phosphors were of melilite type, which has a tetragonal crystallography. The chemical compositions of the sintered phosphors was confirmed by energy dispersive X‐ray spectroscopy. The different thermoluminescence kinetic parameters [activation energy (E), frequency factor (s) and order of the kinetics (b)] of these phosphors were evaluated and compared using the peak shape method. Under ultraviolet excitation, the emission spectra of both Ca2MgSi2O7:Eu2+ and Ca2MgSi2O7:Eu2+,Ce3+ phosphors were composed of a broad emission band peaking at 530 nm. When the Ca2MgSi2O7:Eu2+ phosphor is co‐doped with Ce3+ ions, photoluminescence, afterglow and mechanoluminescence intensity was strongly enhanced. Ca2MgSi2O7:Eu2+ showed some afterglow with a short persist time. On incorporation of Ce3+, efficient energy transfer from Ce3+ to Eu2+ was found and the emission intensity of Eu2+ was enhanced. The mechanoluminescence intensities of Ca2MgSi2O7:Ce3+, Ca2MgSi2O7:Eu2+ and Ca2MgSi2O7:Eu2+,Ce3+ phosphors increased proportionally increased with the increase in impact velocity, which suggests that these phosphors can be used as sensors to detect stress in an object.

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Section: Resultsmentioning

confidence: 99%

Retracted: Studies on the luminescence properties of cerium co‐doping on Ca₂MgSi₂O₇:Eu²⁺ phosphor by solid‐state reaction method

et al. 2017

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“…Silicates are an important class of phosphorescence material because of their high quantum efficiency in visible region, long persistence of phosphorescence, color purity, good stability and good thermal, chemical and radiation resistance [10,11]. The benefit of lanthanide ions as activators has now well established in the field of luminescence [12,13].…”

Section: Introductionmentioning

confidence: 99%

Enhanced long-persistence of Ca2Al2SiO7:Ce3+ phosphors for mechanoluminescence and thermoluminescence dosimetry

Tiwari

Brahme

Sharma

et al. 2016

J Mater Sci: Mater Electron

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Ca 2 Al 2 SiO 7 phosphors having various concentration of Ce 3? were synthesized by combustion-assisted method at initiating temperature of 600°C, using urea as a fuel and its XRD, SEM, TEM and EDX were studied. X-ray diffraction (XRD) pattern indicates that the crystal structure of Ca 2 Al 2 SiO 7 is mainly tetragonal and particle size of prepared phosphor was determined by TEM. Scanning electron microscope (SEM) image was recorded to observe the surface morphology. Mechanoluminescence (ML) and thermoluminescence (TL) properties of Ca 2 Al 2 SiO 7 :Ce 3? phosphors was also investigated. The TL intensity of Ca 2 Al 2 SiO 7 :Ce 3? was recorded for different exposure time of c-irradiation and it was observed that TL intensity is maximum for c dose of 1180 Gy. The increase in TL intensity indicates that the concentration of traps increases with c exposure time. The peak of ML intensity versus time curve increases linearly with increasing impact velocity of the moving piston. The ML intensity increases by increasing c irradiation time up to 1180 Gy. The ML and TL spectra of Ca 2 Al 2 SiO 7 :Ce 3? phosphor exhibits a sharp emission at 400 nm wavelength due to transition of Ce 3? ions. Mechanism of TL and ML excitation and suitability of Ca 2 Al 2 SiO 7 :Ce 3? phosphor for radiation dosimetry have been discussed.

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“…They have been studied widely with Eu 2þ doping, which shows that a green emission and long persistent luminescence by co-doping with some other rare earth ions. A calcium silicate phosphor would be ideal from the manufacturing point of view, because both calcium and silica are abundant and are relatively inexpensive (Talwar et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Europium doped di-calcium magnesium di-silicate orange–red emitting phosphor by solid state reaction method

Sahu

Bisen

Brahme

2015

Journal of Radiation Research and Applied Sciences

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TEM PhotoluminescenceLong afterglow CIE a b s t r a c t A new orangeered europium doped di-calcium magnesium di-silicate (Ca 2 MgSi 2 O 7 :Eu 3þ ) phosphor was prepared by the traditional high temperature solid state reaction method.The prepared Ca 2 MgSi 2 O 7 :Eu 3þ phosphor was characterized by X-ray diffractometer (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM) with energy dispersive x-ray spectroscopy (EDX), fourier transform infrared spectra (FTIR), photoluminescence (PL) and decay characteristics. The phase structure of sintered phosphor was akermanite type structure which belongs to the tetragonal crystallography with space group P42 1 m, this structure is a member of the melilite group and forms a layered compound. The chemical composition of the sintered Ca 2 MgSi 2 O 7 :Eu 3þ phosphor was confirmed by EDX spectra. The PL spectra indicate that Ca 2 MgSi 2 O 7 :Eu 3þ can be excited effectively by near ultraviolet (NUV) light and exhibit bright orangeered emission with excellent color stability. The fluorescence lifetime of Ca 2 MgSi 2 O 7 :Eu 3þ phosphor was found to be 28.47 ms. CIE color coordinates of Ca 2 MgSi 2 O 7 :Eu 3þ phosphor is suitable as orange-red light emitting phosphor with a CIE value of (X ¼ 0.5554, Y ¼ 0.4397). Therefore, it is considered to be a new promising orangeered emitting phosphor for white light emitting diode (LED) application.

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Combustion synthesis of Sr3MgSi2O8:Eu2+ and Sr2MgSi2O7:Eu2+ phosphors

Cited by 37 publications

References 14 publications

Retracted: Studies on the luminescence properties of cerium co‐doping on Ca₂MgSi₂O₇:Eu²⁺ phosphor by solid‐state reaction method

Retracted: Studies on the luminescence properties of cerium co‐doping on Ca₂MgSi₂O₇:Eu²⁺ phosphor by solid‐state reaction method

Enhanced long-persistence of Ca2Al2SiO7:Ce3+ phosphors for mechanoluminescence and thermoluminescence dosimetry

Europium doped di-calcium magnesium di-silicate orange–red emitting phosphor by solid state reaction method

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Combustion synthesis of Sr3MgSi2O8:Eu2+ and Sr2MgSi2O7:Eu2+ phosphors

Cited by 37 publications

References 14 publications

Retracted: Studies on the luminescence properties of cerium co‐doping on Ca2MgSi2O7:Eu2+ phosphor by solid‐state reaction method

Retracted: Studies on the luminescence properties of cerium co‐doping on Ca2MgSi2O7:Eu2+ phosphor by solid‐state reaction method

Enhanced long-persistence of Ca2Al2SiO7:Ce3+ phosphors for mechanoluminescence and thermoluminescence dosimetry

Europium doped di-calcium magnesium di-silicate orange–red emitting phosphor by solid state reaction method

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Retracted: Studies on the luminescence properties of cerium co‐doping on Ca₂MgSi₂O₇:Eu²⁺ phosphor by solid‐state reaction method

Retracted: Studies on the luminescence properties of cerium co‐doping on Ca₂MgSi₂O₇:Eu²⁺ phosphor by solid‐state reaction method