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A kind of germanate long afterglow luminescent material and preparation method thereof

A technology of long-lasting luminescence and germanate, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems that the luminescence band is limited to blue-green light, the luminescence performance is not as good as that of aluminates, and the requirements for equipment and environment are higher, reaching Increased range of luminous colors, duration of strong afterglow, effects of enhanced afterglow performance

Inactive Publication Date: 2021-08-06
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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  • A kind of germanate long afterglow luminescent material and preparation method thereof
  • A kind of germanate long afterglow luminescent material and preparation method thereof
  • A kind of germanate 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 method for preparing a germanate long-lasting luminescent material, the preparation method is used to prepare the aforementioned germanate long-lasting luminescent material, and the preparation method includes Follow the steps below:

[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%. Preferably...

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 sieve to obtain a long afterglow emitting material with a composition of Ga4GeO8:1%Tb3+.

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 long afterglow emitting material with the composition Ga4GeO8:1%Dy3+.

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Abstract

The invention provides a germanium stannate long-lasting luminescent material and a preparation method thereof, and relates to the technical field of inorganic functional materials. The long afterglow luminescent material of the present invention is based on gallium germanate, and the long afterglow luminescent material has the following chemical formula: Ga 4 GeO 8 :xLn 3+ , wherein, Ln is a trivalent rare earth ion and / or a trivalent transition metal ion; x is a mole percentage. The long afterglow luminescent material of the present invention has a slow afterglow attenuation, and the afterglow emission time can last for several hours, and can form a variety of different colors of luminescence and afterglow colors through different doped ions, and has good application prospects and a wide range of application fields .

Description

technical field [0001] The invention relates to the technical field of inorganic functional materials, and in particular to a germanate long-lasting 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-energy ray de...

Claims

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Application Information

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