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Eu3+/Eu2 doped aluminate multicolor fluorescent material and preparing method thereof

A fluorescent material and aluminate technology, applied in the field of solid luminescent materials, can solve the problems of uneven atmosphere contact, expensive preparation facilities, safety problems of reducing gas, etc., and achieve stable physical and chemical properties of products, good ultraviolet absorption, and emission peak intensity. and position-adjustable effects

Active Publication Date: 2015-11-11
NANCHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Europium ions exist in trivalent in nature, and Eu 2+ In doped phosphor, Eu 2+ Ions are mainly obtained by high-temperature solid-phase method in reducing atmosphere or inert atmosphere. Products obtained by high-temperature solid-phase method in reducing or inert atmosphere usually have good reducibility, but there are also There are certain defects, such as uneven contact with the atmosphere, expensive preparation facilities, safety issues of reducing gases, etc.

Method used

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  • Eu3+/Eu2 doped aluminate multicolor fluorescent material and preparing method thereof
  • Eu3+/Eu2 doped aluminate multicolor fluorescent material and preparing method thereof
  • Eu3+/Eu2 doped aluminate multicolor fluorescent material and preparing method thereof

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Effect test

Embodiment 1

[0021] Weigh CaCO 3 : 0.4954g, Al 2 o 3 : 0.5046g, Eu 2 o 3 : 0.0174g, SiO 2 : 0.0744g, a total of 1.0918g. In this embodiment, the heat treatment temperature is 1000° C., and the reaction time is 20 h. X-ray diffraction results (such as figure 1 shown) indicates that the sample is a calcium aluminate phase with a spinel structure. After grinding, measure its emission spectrum at room temperature with F-4600 fluorescence spectrophotometer (e.g. figure 2 shown). Under the excitation of 365nm near-ultraviolet light, Eu was detected 2+ :5 d →4 f weak broadband emission, while Eu 3+ : 5 D. 0 ? 7 f J (J=0,1,2,3,4) The emission intensity is relatively high, indicating that the incorporated Eu 3+ Partially self-reduced to Eu 2+ , and Eu 2+ transfer most of the energy to Eu 3+ , and its emission spectrum color coordinate position is: x=0.4976y=0.286 (such as image 3 ), the position is close to the red light area, and the fluorescent material emits bright red lig...

Embodiment 2

[0023] Weigh CaCO 3 : 0.4954g, Al 2 o 3 : 0.5046g, Eu 2 o 3 : 0.0174g, SiO 2 : 0.1487g Total 1.1661g. In this embodiment, the heat treatment temperature is 1200° C., and the reaction time is 10 h. X-ray diffraction results (such as figure 1 shown) indicates that a new phase appeared in the sample besides the calcium aluminate phase with spinel structure. After grinding, measure its emission spectrum at room temperature with F-4600 fluorescence spectrophotometer (e.g. figure 2 shown). Under the excitation of 365nm near-ultraviolet light, Eu was detected 2+ :5 d →4 f broadband emission, and Eu 3+ : 5 D. 0 ? 7 f J (J=0,1,2,3,4) emission, the intensity difference is not big, indicating that the incorporated Eu 3+ Partially self-reduced to Eu 2+ , Eu 2+ / Eu 3+ There is energy transfer between them, and the emission spectrum color coordinate position is: x=0.389y=0.2181 (such as image 3 ), located close to the white light area, the fluorescent material emits b...

Embodiment 3

[0025] Weigh CaCO 3 : 0.4954g, Al 2 o 3 : 0.5046g, Eu 2 o 3 : 0.0174g, SiO 2 : 0.5948g, a total of 1.6122g. In this embodiment, the heat treatment temperature is 1300° C., and the reaction time is 8 hours. X-ray diffraction results (such as figure 1 shown) shows that the calcium aluminate phase of the sample is close to disappearing, while CaAl appears 2 Si 2 o 8 Mutually. After grinding, measure its emission spectrum at room temperature with F-4600 fluorescence spectrophotometer (e.g. figure 2 shown). Under the excitation of 365 nm near ultraviolet light, Eu was detected 2+ :5 d →4 f Strong broadband emission, and Eu 3+ : 5 D. 0 ? 7 f J (J=0,1,2,3,4) weaker emission, indicating incorporated Eu 3+ Partially self-reducing to Eu 2+ , and its emission spectrum color coordinate position is: x=0.1588y=0.0699 (such as image 3 ), the position is close to the blue-purple area, and the fluorescent material emits bright blue-purple light visible to the naked eye....

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Abstract

The invention discloses an Eu3+ / Eu2 doped aluminate multicolor fluorescent material and a preparing method thereof. A material matrix is composed of CaCO3 and Al2O3 with a molar ratio of 1:1. The molar fraction of the filler Eu2O3 accounts for 2% of the matrix. The molar fraction of the filler SiO2 accounts for x% of the matrix, wherein x=25, 50 or 200. The preparing method comprises the steps of weighing raw materials precisely according to the ratio, mixing the raw materials evenly, and then conducting grinding continuously till mixing is even; placing powder obtained from grinding in a corundum crucible, placing the corundum crucible in a muffle furnace for high-temperature solid-phase reaction for 8-20 h in the air atmosphere at the temperature of 1000-1300 DEG C, taking the corundum crucible out and cooling the corundum crucible to room temperature after the furnace is cooled to 900 DEG C, and obtaining a sample after even grinding. The preparing technology is simple, cost is low, toxicity and pollution are avoided, and the physical and chemical properties of the product are stable. The requirement for experiment equipment, especially the sealing performance of the experiment equipment is quite low, safety performance is high, and mass production can be achieved easily. Eu2+ emission is broadband emission, the intensity and position of an emission peak are adjustable, and ultraviolet absorption can be well achieved.

Description

technical field [0001] The invention belongs to the field of solid luminescent materials. Background technique [0002] Eu 2+ ions are important low-priced rare earth ions, Eu 2+ Doped solid compounds have shown many excellent properties as fluorescent materials, and have been widely used in high-tech fields such as laser, fluorescence, photoluminescence and electroluminescence. Europium ions exist in trivalent in nature, and Eu 2+ In doped phosphor, Eu 2+ Ions are mainly obtained by high-temperature solid-phase method in reducing atmosphere or inert atmosphere. Products obtained by high-temperature solid-phase method in reducing or inert atmosphere usually have good reducibility, but there are also There are certain defects, such as uneven contact with the atmosphere, expensive preparation facilities, safety issues of reducing gases, etc. The principle of self-reduction is that the structural modulation occurs uniformly throughout the material, which ensures the unifor...

Claims

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Application Information

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IPC IPC(8): C09K11/64
Inventor 于立新李宋楚孙家驹
Owner NANCHANG UNIV
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