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Germanium stannate long-afterglow luminescent material and preparation method thereof

A technology of long afterglow luminescence and stannate, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems such as the limitation of the luminous band to blue-green light, high requirements for equipment and environment, and inferior luminescence performance than aluminate, etc. Achieve the effect of increasing the luminous color range, enhancing the afterglow performance, and the duration of strong afterglow

Inactive Publication Date: 2019-03-29
XIAMEN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used long afterglow materials in the existing technology are basically two types of aluminates and silicates, for example: SrAl 2 o 4 :Eu 2+ , Dy 3+ (520nm), blue CaAl 2 o 4 :Eu 2+ ,Nd 3+ (450nm), blue light Sr 4 Al 14 o 25 :Eu 2+ , Dy 3+ (486nm), blue light Sr 2 MgSi 2 o 7 :Eu 2+ , Dy 3+ , green Ca 2 MgSi 2 o 7 :Eu 2+ , Dy 3+ , for aluminate, the main disadvantage is that it is unstable and easy to deliquescence. Although silicate has stable performance, its luminescence performance is not as good as that of aluminate
Moreover, at present, silicate and aluminate are mainly based on Eu 2+ is an activator, but Eu 2+ Doped materials generally require hydrogen environment reduction, high equipment and environmental requirements, and most of the light-emitting bands are limited to blue-green light

Method used

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  • Germanium stannate long-afterglow luminescent material and preparation method thereof
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  • Germanium stannate long-afterglow luminescent material and preparation method thereof

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preparation example Construction

[0034] According to another preferred embodiment of the present invention, the present invention also provides a preparation method of germanium stannate long-lasting luminescent material, the preparation method is used to prepare the aforementioned germanium stannate long-lasting luminescent material, the preparation The method includes the following steps:

[0035] Mixing and grinding: Weigh the raw materials according to the stoichiometric ratio of each element, put the mixed raw materials in an agate mortar, add absolute ethanol or deionized water to grind at room temperature for 1-2 hours, and then put them in an oven for drying Obtain mixed powder. Preferably, the drying temperature of the mixed raw materials in the oven is 50-100°C. Preferably, the raw material includes Ga 2 o 3 、GeO 2 and Ln 3+ oxides or nitrates. Among them, Ln is a trivalent rare earth ion and / or a trivalent transition metal ion, and the raw material Ga 2 o 3 and raw GeO 2 The purity is 99.9...

Embodiment 1

[0043] Take Ga 2 o 3 、GeO 2 and Tb 4 o 7 As raw material, take 0.78178gGa respectively 2 o 3 , 0.218218gGeO 2 and 0.003898gTb 4 o 7 , mix the above raw materials and place them in an agate mortar, add absolute ethanol to grind at room temperature for 1-2 hours, and then put them into an oven at 50-100°C to dry to obtain the mixed powder. Put the mixed powder in an alumina crucible, raise the temperature to 800°C at a rate of 1-10°C in the atmosphere, and burn for 2 hours to obtain a pre-fired sample. The pre-fired sample was ground and placed in an alumina crucible, raised to 1300°C at a rate of 1-10°C in an air atmosphere, burned for 4 hours, and then naturally cooled to room temperature with the furnace. The cooled sample is ground again and sieved with a 20-50 mesh screen to obtain a composition of Ga 4 GeO 8 : 1%Tb 3 + long afterglow material.

Embodiment 2

[0045] Take Ga 2 o 3 、GeO 2 and Dy 2 o 3 As raw material, take 0.78178gGa respectively 2 o 3 , 0.218218gGeO 2 and 0.003898gDy 2 o 3 , mix the above raw materials and place them in an agate mortar, add absolute ethanol to grind at room temperature for 1-2 hours, and then put them into an oven at 50-100°C to dry to obtain the mixed powder. Put the mixed powder in an alumina crucible, raise the temperature to 800°C at a rate of 1-10°C in the atmosphere, and burn for 2 hours to obtain a pre-fired sample. The pre-fired sample was ground and placed in an alumina crucible, raised to 1300°C at a rate of 1-10°C in an air atmosphere, burned for 4 hours, and then naturally cooled to room temperature with the furnace. The cooled sample is ground again and sieved with a 20-50 mesh screen to obtain a composition of Ga 4 GeO 8 : 1% Dy 3 + long afterglow material.

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Abstract

The invention provides a germanium stannate long-afterglow luminescent material and a preparation method thereof and relates to the technical field of an inorganic functional material. According to the invention, gallium germanate is used as a substrate of the long-afterglow luminescent materia. The long-afterglow luminescent material has a following chemical formula: Ga4GeO8:xLn<3+>, wherein Ln is a trivalent rare earth ion and / or a trivalent transition metal ion and x is a molar fraction. The long-afterglow luminescent material provided by the invention has the advantages that afterglow attenuation is slower, afterglow emission time can last for hours, light with different colors and various afterglow colors can be formed by doping different ions, and application prospect is good and application field is extensive.

Description

technical field [0001] The invention relates to the technical field of inorganic functional materials, and in particular to a germanium stannate long afterglow luminescent material. Background technique [0002] Long afterglow luminescent materials are widely used in the fields of nighttime emergency indication, optoelectronic devices or components, instrument displays, low-level lighting, and home decorative lights. The application of materials can be said to affect the development of future technology. [0003] The long afterglow phenomenon is an optical phenomenon that can continue to emit light for several minutes to several hours after the excitation source is removed. The process is divided into energy absorption, energy storage, energy release and afterglow luminous stages. Long afterglow material is a new type of energy storage and electron capture material. It can be applied not only to traditional fields such as emergency lighting and display, but also to high-en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66
CPCC09K11/661
Inventor 付晓燕刘亚楠
Owner XIAMEN UNIV OF TECH
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