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Preparation and Properties of Silicate Long Afterglow Phosphors

Author: SuLin
Tutor: WangRui
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: Long Afterglow Luminescent materials Portland Luminescent glass
CLC: O611.3
Type: Master's thesis
Year: 2007
Downloads: 341
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Abstract


In this paper the development of Long Afterglow status quo, focuses on rare earth doped silicate long afterglow luminescent material development , the status quo , luminescence properties , preparation methods and application prospects . Firstly, using a high-temperature solid-phase method , prepared in a reducing atmosphere Sr MgSi 2 2 O 7 < / sub > : the of Eu 2 , Dy 3 light-emitting materials . Using fluorescence spectrophotometer measuring the excitation spectrum, emission spectrum; the crystalline structure of the sample was measured by X-ray diffraction analyzer ; the doping amount of the rare earth ions and the co- solvent is added to the relationship between the amount of the light emitting properties , determine the performance silicate Long Afterglow good material formulations . Further study of the sintering temperature , sintering time , the raw material particle size and other factors on the influence of the afterglow performance , and process conditions identified the prepared silicate afterglow material . The luminous powder prepared initial brightness of up to 3000mcd.m-2, the afterglow time up to 30h . On this basis , the sol - gel method , the temperature about 150 ℃ lower than the high-temperature solid-phase method , synthesis of Sr2MgSi2O7 of : Eu 2 , the Dy 3 afterglow materials, comparison the photoluminescence behavior the afterglow powders obtained by this method with the high - temperature solid-phase method , and the afterglow properties . High temperature solid-phase synthesis of powders afterglow performance is higher than the sol - gel powder , because the high-temperature solid -phase synthesis of a higher concentration of electronics stuck inside the matrix . This paper studies the blue luminescent glasses Synthesis and luminescent properties , respectively, using a one-step and two-step preparation of luminescent glasses , one-step means the ingredients melt and then cooling at high temperature in a reducing atmosphere to form a large number of micro- the crystal structure of the glass 25SrO-20ZnO-10B2O3-45SiO2: 0.005Eu 2 , 0.04Dy 3 (1G); two-step means by the high temperature of the glass matrix and luminescent powder . melting prepared luminescent glasses . With Sr2MgSi2O7 : Eu 2 < / sup> , the Dy 3 < / sup> luminous powder and glass matrix , in 1000 ℃ ~ 1100 ℃ protective atmosphere firing 8min 12min prepared luminescent glasses (2G). The obtained glass emits blue light , the initial brightness of up 400mcd.m-2 afterglow longer than 2h .

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Chemical elements and inorganic compounds > Nature
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