Anti-counterfeiting label material with negative thermal quenching effect and its preparation method and application

An anti-counterfeiting label and effect technology, which is applied in the field of anti-counterfeiting label materials, can solve the problem of insufficient luminous intensity effect and achieve the effects of enriching temperature dependence, enriching multi-color luminescence, and enhancing luminous intensity

Active Publication Date: 2021-03-05
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recent research results show that nanomaterials can produce a negative thermal quenching effect caused by surface defects, but the effect of this luminous intensity enhancement with increasing temperature is not obvious enough

Method used

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  • Anti-counterfeiting label material with negative thermal quenching effect and its preparation method and application
  • Anti-counterfeiting label material with negative thermal quenching effect and its preparation method and application
  • Anti-counterfeiting label material with negative thermal quenching effect and its preparation method and application

Examples

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Effect test

Embodiment 1

[0023] Anti-counterfeiting label material with negative thermal quenching effect, the molecular formula is NaGdF 4 @20Ca / 20Yb / 2Er: NaScF 4 , prepared by the following steps:

[0024] (1) Add 0.8 mmol of gadolinium acetate and 8 ml of oleic acid into a three-necked flask with a capacity of 50 ml, and adjust the temperature to 155 °C under the protection of a nitrogen atmosphere. o C and keep warm for 30 minutes; add 12 milliliters of octadecene to the three-necked flask, and adjust the temperature to 150 o After C, keep warm for 30 minutes to obtain a clear solution B; after the B solution is naturally cooled to room temperature, add 8 milliliters of methanol solution containing 3 mmol of ammonium fluoride and 2 mmol of sodium hydroxide dropwise to the B solution, and wait for the temperature to rise. to 60 o C and keep it warm for half an hour; after the methanol solution is completely volatilized, quickly raise the temperature to 280 o C, after being incubated at this tem...

Embodiment 2

[0029] Anti-counterfeiting label material with negative thermal quenching effect, the molecular formula is NaGdF 4 @40Ca / 20Yb / 2Er: NaScF 4 , prepared by the following steps:

[0030] (1) Add 0.8 mmol of gadolinium acetate and 8 ml of oleic acid into a three-necked flask with a capacity of 50 ml, and adjust the temperature to 155 °C under the protection of a nitrogen atmosphere. o C and keep warm for 30 minutes; add 12 milliliters of octadecene to the three-necked flask, and adjust the temperature to 150 o After C, keep warm for 30 minutes to obtain a clear solution B; after the B solution is naturally cooled to room temperature, add 8 milliliters of methanol solution containing 3 mmol of ammonium fluoride and 2 mmol of sodium hydroxide dropwise to the B solution, and wait for the temperature to rise. to 60 o C and keep it warm for half an hour; after the methanol solution is completely volatilized, quickly raise the temperature to 280 o C, after being incubated at this tem...

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Abstract

The invention belongs to the field of inorganic luminescent materials. Anti-counterfeiting label material with negative thermal quenching effect, the molecular formula is NaGdF 4 @xCa / yYb / zEr:NaScF 4 ,x between 10‑40, in xCa / yYb / zEr:NaScF 4 Corresponds to Ca in 2+ The dopant ion concentration is 10%‑40%, y is between 10‑30, in xCa / yYb / zEr:NaScF 4 Corresponds to Yb in 3+ The dopant ion concentration is 10‑30%, z is between 2‑10, in xCa / yYb / zEr:NaScF 4 Corresponds to Er in 3+ The dopant ion concentration is 2‑10%. The material can greatly enhance the negative thermal quenching effect without changing the size of the nanocrystal, that is, the luminous intensity is greatly enhanced with the increase of temperature.

Description

technical field [0001] The invention belongs to the field of inorganic luminescent materials and relates to an anti-counterfeiting label material. [0002] technical background [0003] As the temperature increases, the number of phonons in traditional thermally quenched materials gradually increases, and the probability of non-radiative relaxation caused by phonon assistance increases, resulting in a gradual decrease in the fluorescence intensity of activated ions with increasing temperature. This result seriously hinders the development of lanthanide-doped luminescent materials in related application fields. For example, at high temperatures, optical thermometers have large errors; temperature-dependent colorimetric materials have a limited range of relative spectral changes, etc. Recent research results have shown that nanomaterials can produce negative thermal quenching effect caused by surface defects, but this effect of luminous intensity enhancement with increasing tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/85G09F3/02
CPCC09K11/025C09K11/7773G09F3/0294
Inventor 徐时清雷磊肖珍华有杰夏洁楠
Owner CHINA JILIANG UNIV
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