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La2Hf2O7 system inorganic luminous material and preparation method thereof

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

Active Publication Date: 2018-04-13
佛山市丰源新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • La2Hf2O7 system inorganic luminous material and preparation method thereof
  • La2Hf2O7 system inorganic luminous material and preparation method thereof
  • La2Hf2O7 system inorganic luminous material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 6

[0135] Add 1.52 mmol of lanthanum nitrate, 0.3 mmol of ytterbium nitrate, 0.18 mmol of europium nitrate, 0.002 mmol of erbium nitrate and 2 mmol of citric acid into 8 ml of ethanol, stir for 30 minutes; then add 2 mmol of hafnium acetylacetonate and Stir for 30 minutes; at 50 o The temperature of C was incubated for 2 hours to obtain the xerogel; the xerogel was ground for 30 minutes, then placed in a muffle furnace, at 700 o C was kept warm for 4 hours, and the final product was obtained after cooling with the furnace.

[0136] Powder X-ray diffraction analysis shows that: the obtained product is pure cubic phase La 2 f 2 o 7 ( figure 1 ). Under 980nm laser irradiation, Yb / Er / Eu: La 2 f 2 o 7 Can get Er 3+ Ions emit bright green light with faint Eu in the spectrum 3+ Luminescence band ( figure 2 ). at 298nm ( image 3 ), 365nm ( Figure 4 ) with 415nm ( Figure 5 ) under xenon lamp excitation conditions, Eu 3+ Bright red light is emitted.

Embodiment 2

[0138] Add 1.68 mmol of lanthanum 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 hafnium acetylacetonate 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 cool down with the furnace to obtain the final product.

Embodiment 3

[0140] Add 1.42 mmol of lanthanum 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 hafnium acetylacetonate 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 cool down with the furnace to obtain the final product.

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Abstract

The invention provides a La2Hf2O7 system inorganic luminous material. The molecular formula of the inorganic luminous material is Yb / Eu / Er: La2Hf2O7, and by mole percent, the doping amount of Yb is 10-30%, the doping amount of Eu is 1-10%, and the doping amount of Er is 0.001-0.01%; and under the condition that the inorganic luminous material is excited by 980 nm, upconversion green emission of Er3+ ions can be obtained, and under the condition that the inorganic luminous material is excited by xenon lamps with the light of 298 nm, 365 nm and 415 nm, down-conversion red emission of Eu3+ is obtained. By the system, upconversion green emission and down-conversion red emission can be realized simultaneously by the system, emission peaks source from different rare earth ions, and have different spectral shapes, various rare earth ions are simply mixed in some common matrix systems, due to large non-radiative cross relaxation probability of the rare earth ions, upconversion light emitting and down-conversion light emitting are difficultly realized simultaneously, and therefore, the system can be applied to anti-counterfeit label materials.

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): C09K11/78G09F3/02C08K3/22C09D5/22C09D11/03
CPCC08K3/22C08K2003/221C09D5/22C09D11/03C09K11/7787G09F3/0294
Inventor 杨道救
Owner 佛山市丰源新材料科技有限公司
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