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Study on the Preparation and Properties of Sr3Al2O6 System Red Luminescent Materials

Author: ZhangLing
Tutor: GeMingQiao
School: Jiangnan University
Course: Textile Engineering
Keywords: Sr3Al2O6: Eu2, Dy3 The red luminescent material Crystal structure Luminescent properties Afterglow
CLC: TB34
Type: Master's thesis
Year: 2010
Downloads: 45
Quote: 0
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Abstract


Rare earth ion activated alkaline earth aluminate long afterglow luminescent material with its high luminous efficiency, long afterglow time, chemically stable and no radiation pollution-free, has been widely used in various fields, including the yellow-green light-emitting materials of of SrAl2O4: Eu < sup> 2 , Dy 3 and blue-green light-emitting material Sr 4 Al 14 O 25 : Eu 2 , Dy 3 has reached the industrial production standard aluminate luminescent materials to match red relative lack, there are still not high luminescence brightness and afterglow shorter time, research on the the aluminate Red Luminescent mechanism is not yet ripe. This topic using high-temperature solid phase prepared by Sr 3 Al 2 O 6 of red light-emitting materials, by changing the calcination temperature, the addition of flux amount of activator content and the doping of sulfur ions to study Sr 3 Al 2 O 6 of red light-emitting materials, luminescent properties. X-ray powder diffraction analysis of crystal structure of the samples, with the excitation spectrum, the emission spectrum and the afterglow decay curve of the light emitting properties of the samples were characterized. Studies have shown that: the sample matrix doped sulfur ion mixing matrix samples main crystalline phase Sr3Al the 2 O 6 , and a small amount of impurity SrS Eu 2 luminous center is still in a mixed matrix affect the light-emitting properties of the material, with the of Eu 2 content reduction, the sample \2 content of 0.010 or less, the emission spectrum of the sample from the peak in 612nm near a broadband spectrum. Dy 3 in a mixed matrix mainly play a supporting role of the activator, affecting the performance of the afterglow of the sample. Undoped sulfur ions, add a certain amount of flux boric acid samples calcined at 1200 ℃ for 3h can form a single, perfect crystallinity Sr 3 Al 2 O 6 crystal, the emission spectra of the two emission peaks, the peak at 595nm and 615nm near, the afterglow performance is also better. Flux borate affects not only the firing temperature of the sample, but also affect the afterglow luminance and afterglow time of the sample. The activator Eu 2 and auxiliary activator Dy 3 content does not affect the crystal structure of the sample. The excitation spectrum in the visible region have a very wide excitation band, falls within the range of a wavelength of 400 ~ 530nm.

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