Fluorescent material with core-shell structure and preparation method thereof
A technology of fluorescent material and core-shell structure, which is applied in the field of core-shell structure fluorescent material and its preparation, and can solve the problems of weak luminescence performance and complex process of phosphor materials
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[0023] The method for preparing a fluorescent material with a core-shell structure according to an embodiment of the present invention comprises the following steps:
[0024] 1.SiO2 2 Preparation of microspheres:
[0025] 1.1 Add 1-20mL of deionized water, 15-50mL of absolute ethanol and 1-9mL of ammonia water into the Erlenmeyer flask, mix well under magnetic stirring, and then add dropwise 0.5-6mL of tetraethyl orthosilicate (TEOS) , after the dropwise addition is completed, continue to stir the reaction for 2 to 6 hours to obtain SiO 2 Microsphere precipitation;
[0026] 1.2 SiO obtained in the above step 1.1 2 The microsphere precipitation was centrifuged at a speed of 9000rpm to 14000rpm and washed three times with deionized water to remove the remaining ammonia and residual TEOS to obtain SiO 2 microsphere particles;
[0027] 1.3 SiO obtained in the above step 1.2 2 The microsphere particles were redispersed into 10-50mL deionized water by ultrasonic dispersion to ...
Embodiment 1
[0049] Preparation of silica microspheres: Place 1mL of deionized water, 15mL of absolute ethanol and 1mL of ammonia water in an Erlenmeyer flask, mix them evenly under magnetic stirring, and then add 0.5mL of ethyl orthosilicate dropwise Ester (TEOS), after the dropwise addition is completed, continue to stir the reaction for 2h to obtain SiO 2 microsphere suspension liquid; the resulting SiO 2 The microsphere suspension was centrifuged at 12000rpm and washed three times with deionized water to remove the remaining ammonia and residual TEOS to obtain SiO 2 microspheres; the resulting SiO 2 The microspheres were redispersed into deionized water by ultrasonic dispersion to obtain 10 mL of silica suspension, which was designated as A1.
[0050] SiO 2 @(Gd 0.98 , Eu 0.02 ) 2 o 3 Preparation of core-shell fluorescent materials: according to Gd(NO 3 ) 3 : Eu(NO 3 ) 3 The molar ratio of 0.98:0.02 weighs 1.774g Gd 2 o 3 and 0.0352gEu 2 o 3 , the Gd 2 o 3 and Eu 2 o ...
Embodiment 2
[0053] Preparation of silica microspheres: Mix 10mL of deionized water, 25mL of absolute ethanol and 4mL of ammonia water in an Erlenmeyer flask, mix them evenly under magnetic stirring, and then add 1mL of ethyl orthosilicate dropwise Ester (TEOS), after the dropwise addition is completed, continue to stir and react for 3h to obtain SiO 2 microsphere suspension liquid; the resulting SiO 2 The microsphere suspension was centrifuged at 9000rpm and washed three times with deionized water to remove the remaining ammonia and residual TEOS to obtain SiO 2 microspheres; the resulting SiO 2 The microspheres were redispersed into deionized water by ultrasonic dispersion to obtain 10 mL of silica suspension, which was designated as A2.
[0054] SiO 2 @(Gd 0.95 , Tb 0.05 ) 2 o 3 Preparation of core-shell fluorescent materials: according to Gd(NO 3 ) 3 : Tb(NO 3 ) 3 The molar ratio of 0.95:0.05 weighs 3.810g Gd 2 o 3 and 0.183gTb 2 o 3 , the Gd 2 o 3 and Tb 2 o 3 Disso...
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