Luminescent centre regionally doped rare earth upconversion luminescent material and preparation method thereof
A rare earth up-conversion and luminescent center technology, which is applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of small doping amount of luminescent centers and low luminous efficiency, achieve uniform distribution, increase doping threshold, and enhance luminous efficiency Effect
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specific Embodiment approach 1
[0027] Embodiment 1: A kind of rare earth up-conversion fluorescent material doped with luminescent center in different regions according to the present invention. The specific scheme is as follows. NaYF 4 It is a matrix, doped with rare earth sensitizing ions and rare earth luminescent ions, and has a core / shell structure and nanocrystalline micromorphology. It is characterized in that a layer of luminescent shell is coated outside the core / shell structure, and the outermost layer is Sensitized shell.
[0028] The rare earth sensitizing ion doped by the outermost sensitizing shell layer is Yb 3+ .
[0029] The rare earth luminescent ions doped in the luminescent shell layer are Er 3+ 、Tm 3+ or Ho 3+ .
[0030] NaYF 4 :Er 3+ , Yb 3+ / NaYF 4 :Yb3+ / NaYF 4 :Er 3+ , Yb 3+ / NaYF 4 :Yb 3+ For example, the rare earth sensitizing ion of this kind of rare earth up-conversion fluorescent material and the ion doped by the outermost layer of the sensitizing shell are Yb 3+...
specific Embodiment approach 2
[0036] Specific implementation mode two: the concentration of luminescent centers is 2%
[0037] (1) Luminescent shell precursor NaYF 4 :Er 3+ (2%,) Yb 3+ (20%) preparation:
[0038] 0.272 g CF 3 COONa, 0.376 g Y(CF 3 COO) 3 , 0.113 g Yb (CF 3 COO) 3 and 0.011g of Er(CF 3 COO) 3 Dissolve in 10ml of oleylamine and stir at 100°C for 30 minutes.
[0039] (2) Sensitized shell precursor NaYF 4 :Yb 3+ (20%) preparation:
[0040] 0.272 g CF 3 COONa, 0.376 g Y(CF 3 COO) 3 and 0.126 g of Yb (CF 3 COO) 3 Dissolve in 10ml of oleylamine and stir at 100°C for 30 minutes.
[0041] (3) Add 5ml of luminous shell precursor NaYF to the three-necked flask 4 :Er 3+ (2%,) Yb 3+ (20%) solution, under the protection of argon, gradually warming up to 320 ° C, the heating rate is about 10 ° C / min, stirring and keeping the reaction for 60 minutes to form NaYF 4 :Er 3+ (2%), Yb 3+ (20%) Luminous nuclei.
[0042] (4) Cool the above-mentioned nuclear solution to 150°C, and drop ...
specific Embodiment approach 3
[0046] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the concentration of luminescent centers in this embodiment is 3%.
[0047] combine image 3 Description of this embodiment
[0048] (1) Luminescent shell precursor NaYF 4 :Er 3+ (3%,) Yb 3+ (20%) preparation:
[0049] 0.272 g CF 3 COONa, 0.376 g Y(CF 3 COO) 3 , 0.113 g Yb (CF 3 COO) 3 and 0.017g gram Er(CF 3 COO) 3 Dissolve in 10ml of oleylamine and stir at 100°C for 30 minutes.
[0050] (2) Sensitized shell precursor NaYF 4 :Yb 3+ (20%) preparation:
[0051] 0.272 g CF 3 COONa, 0.376 g Y(CF 3 COO) 3 and 0.126 g of Yb (CF 3 COO) 3 Dissolve in 10ml of oleylamine and stir at 100°C for 30 minutes.
[0052] (3) Add 5ml of the luminous shell precursor NaYF to the three-necked flask 4 :Er 3+ (2%,) Yb 3+ (20%) solution, under the protection of argon, gradually warming up to 320 ° C, the heating rate is about 10 ° C / min, stirring and keeping the reaction for 60 minutes to for...
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