Polyacrylic acid modified rod-shaped monodisperse nagdf 4 :yb 3+ ,er 3+ Upconversion Phosphor

Abstract

The invention discloses a preparing method of polyacrylic acid-modified rodlike monodisperse NaGdF4: Yb<3+> and Er<3+> upconversion fluorescent powder. A hydrothermal method is adopted, polyacrylic acid serves as a surface modifier, by regulating usage of the polyacrylic acid, a pH value and a proportion among NaF, NH4HF2 and total quantity of rare earth ions, synthesis of the rodlike NaGdF4: Yb<3+> and Er<3+> upconversion fluorescent powder is realized, the prepared fluorescent powder has monodispersity, the method is simple in preparing process and enriches a representing manner of the NaGdF4: Yb<3+> and Er<3+> upconversion fluorescent powder, and the polyacrylic acid-modified rodlike monodisperse NaGdF4: Yb<3+> and Er<3+> upconversion fluorescent powder has broad application prospect in preparing of a sequential array organic-inorganic composite thin film and the photoluminescence field.

Description

technical field [0001] The invention belongs to the technical field of preparation of surface-modified rare earth luminescent materials, in particular to a polyacrylic acid-modified rod-shaped monodisperse NaGdF 4 : Yb 3+ , Er 3+ Preparation method of up-conversion phosphor. Background technique [0002] Yb 3+ 、Er 3+ double doped NaGdF 4 Nanoparticles have excellent up-conversion luminescence properties and paramagnetism, and have great application potential in green lighting sources and magnetic-fluorescent dual-mode molecular probes for early diagnosis and treatment of tumors. At present, many methods have been used to synthesize NaGdF doped with rare earth ions. 4 Nanoparticles, phosphor particles synthesized by traditional co-precipitation method, thermal deposition method, hydrothermal or solvothermal method, most of the research results have focused on the research of Gd ion paramagnetism and luminous color, and NaGdF 4 Nanoparticle morphology is rarely studied ...

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Problems solved by technology

At present, many methods have been used to synthesize NaGdF doped with rare earth ions. 4 Nanoparticles, phosphor particles synthesized by traditional co-precipitation method, thermal deposition method, hydrothermal or solvothermal method, most of the research results have focused on the research of Gd ion paramagnetism and luminous color, and NaGdF 4 Nanoparticle morphology is rarely studied or the process is complicated, and NaGdF 4 Its water solubility is not high, and the surfactant and other substances used in the synthesis process make it difficult to dissolve in polar solvents, which hinders its application in biology and organic-inorganic composite materials, so the NaGdF 4 Surface modification is very important (references: Yunxin Liu et al. Magnetic Tuning of Upconversion Luminescence in Lanthanide-Doped Bifunctional Nanocrystals, Angew. Chem. Int. Ed. 2013, 52, 4366–4369; Rui Cheng et al. Citric acid- assisted growth of lanthanide ions co-doped one-dimensional upconversion microcrystals and their photovoltaic applications, JMater Sci: Mater Electron, 2014, 25, 4066–4073)

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