کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7908567 | 1510776 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Luminescence properties of dysprosium doped di-calcium di-aluminium silicate phosphors
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
A Dysprosium doped di-calcium di-aluminium silicate phosphor emitting long-lasting white light was prepared and investigated. Phosphors were synthesized by combustion-assisted method. The effect of doping concentration on the crystal structure and luminescence properties of Ca2Al2SiO7:Dy3+ phosphors were investigated. The phase structure, surface morphology, particle size, elemental analysis was analyzed by using X-ray diffraction (XRD), transmission electron microscope (TEM), Scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDX) techniques. X-ray diffraction (XRD) profiles showed that all peaks could be attributed to the tetragonal Ca2Al2SiO7 phase when the sample was annealed at 1100 °C. The increase in TL intensity indicates that the concentration of traps increases with UV irradiation. Under the UV-excitation, the Thermoluminescence (TL) emission spectra of Ca2Al2SiO7:Dy3+ phosphor shows the characteristic emission of Dy3+ peaking at 484 nm (blue), 583 nm (yellow) and 680 nm (red), originating from the transitions of 4F9/2 â 6H15/2, 4F9/2 â 6H13/2 and 4F9/2 â 6H11/2. Photoluminescence (PL) decay has also reported and it indicates that Ca2Al2SiO7:Dy3+ phosphor contains fast decay and slow decay process. The peak of Mechanoluminescence (ML) intensity increases linearly with increasing impact velocity of the moving piston. The possible mechanism of Thermoluminescence (TL), Photoluminescence (PL) and Mechanoluminescence (ML) of this white light emitting long lasting phosphor is also investigated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 58, August 2016, Pages 234-242
Journal: Optical Materials - Volume 58, August 2016, Pages 234-242
نویسندگان
Geetanjali Tiwari, Nameeta Brahme, Ravi Sharma, D.P. Bisen, Sanjay K. Sao, Shalinta Tigga,