An upconversion β-nayf4:yb3+/er3+@yof core-shell microcrystalline material and its preparation method
A micro-crystal and core-shell technology, applied in the field of preparation of micro-crystal with heterogeneous core-shell structure, can solve the problem of low photoelectric conversion efficiency of sensitized solar cells, achieve low thermal stability and mechanical strength, good solubility, and chemical stability High performance and thermal stability
Active Publication Date: 2019-03-19
HARBIN INST OF TECH
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[0003] The purpose of the present invention is to provide an up-conversion β-NaYF 4 :Yb 3+ / Er 3+ @YOF core-shell microcrystalline material and its preparation method
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specific Embodiment approach 1
[0022] Specific implementation mode 1: up-converting β-NaYF in this embodiment 4 :Yb 3+ / Er 3+ @YOF core-shell microcrystalline material is based on Yb 3+ 、Er 3+ Doubly doped β-NaYF 4 As the core, particles with yttrium oxyfluoride (YOF) as the shell, of which Yb 3+ 、Er 3+ Doubly doped β-NaYF 4 Middle Yb 3+ Accounted for 18% ~ 22%, Er 3+ 1% to 3%, Y 3+ Accounted for 75% to 81%.
specific Embodiment approach 2
[0023] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that, in terms of molar percentage, Yb 3+ 、Er 3+ Doubly doped β-NaYF 4 Middle Yb 3+ Accounting for 20%, Er 3+ 2%, Y 3+ 78%. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0024] Specific embodiment three: the difference between this embodiment and specific embodiment one is that, in terms of molar percentage, Yb 3+ 、Er 3+ Doubly doped β-NaYF 4 Middle Yb 3+ Accounted for 22%, Er 3+ 1%, Y 3+ 77%. Others are the same as in the first embodiment.
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Abstract
The invention provides an upconversion NaYF4:Yb3+ / Er3+@YOF core shell micrometer crystal material and a preparation method of the same, and relates to a method of heterogeneous core shell compositionmicrometer crystal, for solving the technical problem that a dye sensitization solar cell prepared by the prior art is low in the photoelectric conversion efficiency. The upconversion NaYF4:Yb3+ / Er3+@YOF core shell micrometer crystal material is particles taking double doped Beta-NaYF4 of Yb3+ and Er3+ as the core, and taking fluorine yttrium oxide as the shell. The preparation method of the upconversion NaYF4:Yb3+ / Er3+@YOF core shell micrometer crystal material includes the steps: preparing Beta-NaYF4:Yb3+ / Er3 by means of a hydrothermal method, and drying the Beta-NaYF4:Yb3+ / Er3 to obtain powder; and putting the powder into an alumina crucible for sintering to obtain the upconversion NaYF4:Yb3+ / Er3+@YOF core shell micrometer crystal material. The photoelectric conversion efficiency of thedye sensitization cell prepared by means of the upconversion NaYF4:Yb3+ / Er3+@YOF core shell micrometer crystal material is 8.39%. The upconversion NaYF4:Yb3+ / Er3+@YOF core shell micrometer crystal material can be applied to the solar cell field.
Description
technical field [0001] The invention relates to a method for preparing microcrystals with heterogeneous core-shell structure. Background technique [0002] As the most anticipated new energy source, solar energy has the advantages of inexhaustibility, inexhaustibility, and safety. With the continuous innovation of solar power generation technology, human beings will enter a new energy era with solar energy as the main body. The third-generation solar cell "dye-sensitized solar cell" is a new type of photochemical solar cell, which is a type of semiconductor photoelectrochemical cell with a dye molecule-sensitized porous titanium oxide micron film as the photoanode. Compared with the first-generation and second-generation solar cells, its preparation process is simple, it has relatively high power conversion efficiency and potential commercial value, so dye-sensitized solar cells have attracted widespread attention, and will be used in future photovoltaic cells Alternatives...
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IPC IPC(8): H01G9/20H01G9/00
CPCY02E10/542
Inventor 郝树伟田莉尚云飞陈童杨春晖
Owner HARBIN INST OF TECH