Microwave preparation method of Ce and Sm co-doping Lu3Al5O12 nanometer fluorescent powder

Abstract

The invention relates to a microwave preparation method of Ce and Sm co-doping Lu3Al5O12 nanometer fluorescent powder. The method is characterized in that metal nitrate is used as an oxidizing agent;glycine is used as a reducing agent to form a precursor raw material; water is used as a solvent for preparing a precursor solution. The obtained clarified precursor solution is put into a microwave oven to be heated for 10 to 20 minutes to obtain precursor powder; the precursor powder and fluxing agents LiF are uniformly mixed; the mixture is put into a microwave sintering furnace to be roasted for 2h at 850 to 950 DEG C to obtain LuAG:Ce,Sm nanometer powder. The method provided by the invention has the advantages that the process is simple; the synthesis speed is high; the energy consumptionis low; the material can be uniformly heated; the prepared powder has small crystal gain, uniform dimension and good dispersibility. Through Sm<3+> doping, the luminescence of LuAG:Ce yellow luminescence powder in a red region can be expanded.

Description

technical field [0001] The invention belongs to the field of inorganic non-metal nanomaterials, in particular to a Ce, Sm co-doped Lu 3 al 5 o 12 Microwave preparation method of nano phosphor powder. Background technique [0002] Semiconductor lighting is a lighting method in which semiconductor light-emitting diodes (LEDs) are used as light sources. LuAG has the advantages of excellent physical and chemical properties and optical isotropy, and is an optical matrix material with great development potential. Compared with YAG, phosphors prepared with LuAG as the matrix have higher lumen efficiency, photon efficiency and thermal stability. Using InGaN or GaN blue LED wafer as excitation light source, with Ce-doped Lu 3 al 5 o 12 (LuAG) as a yellow phosphor material can be combined into a white LED. [0003] Commonly used LuAG nanopowder preparation methods include solid-state reaction method, co-precipitation method, sol-gel combustion method and so on. YuY et al prep...

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Problems solved by technology

YuY et al prepared Ce by a two-step solid-state reaction method 3+ Doped LuAG phosphors, see Effects of various fluxes on the morphology and optical properties of Lu3-xAl5O12:xCe3+, green phosphors[J].Ceramics International,2014,40(9):14171-14175.Pan L et al. adopted co-precipitation LuAG nano-powders were prepared by sol-gel combustion method, see Co-precipitation synthesis of lutetium aluminum garnet (LuAG) powders: The influence of ethanol[J]. Powder, see Investigation of the structural and photoluminescence properties of Ce 3+ +-doped LuAGnanopowders prepared via sol–gel method[J].Optical Materials,2015,40:14-19. However, the above methods all have some disadvantages, such as: the solid phase reaction method has high reaction temperature, long holding time, and the product Low purity and easy agglomeration are not conducive to the preparation of high-quality powder; the coprecipitation method and the sol-gel combustion method need to strictly control the pH value of the solution during the preparation process, and the operation is relatively complicated

In addition, the above technologies are facing some problems: ①The dispersion of phosphor particles is poor, which affects the operability of the coating process and the color uniformity of the output light; ②Defects in red light emission lead to low color rendering index of the prepared white LED, The color temperature is high, which is harmful to the health of human eyes

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