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Gd2Ti2O7 system inorganic luminescent material and preparation method thereof

A technology of gd2ti2o7 and luminescent materials, applied in luminescent materials, chemical instruments and methods, inks, etc., can solve the problems of easy imitation of fluorescent characteristics and difficult optical anti-counterfeiting label materials.

Active Publication Date: 2018-04-24
东营睿港招商服务有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the common fluorescence characteristics of these rare earth ions are easy to be imitated, and it is not easy to be directly applied to optical anti-counterfeiting label materials

Method used

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  • Gd2Ti2O7 system inorganic luminescent material and preparation method thereof
  • Gd2Ti2O7 system inorganic luminescent material and preparation method thereof
  • Gd2Ti2O7 system inorganic luminescent material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0139] Add 1.44 mmol gadolinium nitrate, 0.4 mmol ytterbium nitrate, 0.16 mmol europium nitrate, 0.002 mmol erbium nitrate and 2 mmol citric acid to 8 ml ethanol, stir for 30 minutes; then add 2 mmol tetrabutyl titanate Ester and stir for 30 minutes; heat at 50°C for 2 hours to obtain dry gel; grind the dry gel for 30 minutes, then put it in a muffle furnace, keep it at 700°C for 4 hours, and obtain the final product after cooling with the furnace .

[0140] Powder X-ray diffraction analysis shows that the obtained product is pure cubic phase Gd 2 Ti 2 o 7 ( figure 1 ). Under 980nm laser irradiation, Yb / Er / Eu: Gd 2 Ti 2 o 7 Can get Er 3+ The ion has a bright near-single-band red emission with faint Eu in the spectrum 3+ Luminescence band ( figure 2 ). By monitoring the emission at 616 nm, an excitation spectrum with multiple fluorescence peaks can be obtained ( image 3 ). at 361nm ( Figure 4 ), 393nm ( Figure 5 ), 414nm ( Figure 6 ) with 465nm ( Figure 7...

Embodiment 2

[0142] Add 1.68 mmol of gadolinium nitrate, 0.2 mmol of ytterbium nitrate, 0.12 mmol of europium nitrate, 0.005 mmol of erbium nitrate and 2 mmol of citric acid into 8 ml of ethanol, stir for 30 minutes; then add 2 mmol of tetrabutyl titanate Ester and stir for 30 minutes; heat at 50°C for 2 hours to obtain dry gel; grind the dry gel for 30 minutes, then put it in a muffle furnace, keep it at 700°C for 4 hours, and obtain the final product after cooling with the furnace .

Embodiment 3

[0144] Add 1.42 mmol of gadolinium nitrate, 0.5 mmol of ytterbium nitrate, 0.08 mmol of europium nitrate, 0.001 mmol of erbium nitrate and 2 mmol of citric acid into 8 ml of ethanol, stir for 30 minutes; then add 2 mmol of tetrabutyl titanate Ester and stir for 30 minutes; heat at 50°C for 2 hours to obtain dry gel; grind the dry gel for 30 minutes, then put it in a muffle furnace, keep it at 700°C for 4 hours, and obtain the final product after cooling with the furnace .

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Abstract

The invention belongs to the field of inorganic luminescent materials and relates to an inorganic luminescent material. A molecular formula of the inorganic luminescent material is Yb / Eu / Er:Gd2Ti2O7;according to molar percentage, the doping amount of the Yb is 10 to 30%, the doping amount of the Eu is 1 to 10%, and the doping amount of the Er is 0.001 to 0.01%; the inorganic luminescent materialcan obtain conversion red light emission of Er<3+> ions on an approximate single spectrum band under the 980nm excitation condition and can obtain down- conversion red light emission of Eu<3+> under the 361nm, 393nm, 414nm and 465nm xenon lamp excitation. The system disclosed by the invention can achieve up-down conversion red light emission at the same time; furthermore, emission peaks come fromdifferent rare earth ions and have different spectrum shape; varieties of rare earth ions are simply mixed in common substrate systems, as the nonradiative cross relaxation probability among the rareearth ions is larger, up-down conversion light emission hardly can be achieved at the same time; thus, the system disclosed by the invention can be applied to an anti-counterfeit label material.

Description

technical field [0001] The invention belongs to the field of inorganic luminescent materials. Background technique [0002] Optical anti-counterfeiting labels design special fluorescent materials into patterns or characters, and then identify them with the naked eye or professional instruments under the illumination of external light sources. Among them, the optical characteristics of fluorescent materials determine the difficulty of imitation and duplication of anti-counterfeiting labels. Rare earth ions have a rich energy level structure and can achieve different colors of light emission. For example, by co-doping Yb / Er, under the condition of 980nm laser excitation, Er can be obtained 3+ The green light emission, by co-doping Ce / Eu, under the irradiation of ultraviolet light, can get Eu 3+ of red light emission. However, the common fluorescence characteristics of these rare earth ions are easy to be imitated, and it is not easy to be directly applied to optical anti-cou...

Claims

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Application Information

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IPC IPC(8): C09K11/78C09D11/50
CPCC09D11/50C09K11/7787
Inventor 杨道救
Owner 东营睿港招商服务有限责任公司
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