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
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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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