A caf with good luminescent properties under high pressure 2 :tb 3+ Nanomaterials and their preparation methods

Abstract

The invention discloses a CaF2:Tb<3+> nano material with good light-emitting performance under high pressure and a preparation method thereof. The preparation method which is a green chemical method using a solvothermal method to synthesize the CaF2:Tb<3+> nano material in one step is characterized in that Ca(NO3)2 and Tb(NO3)3 are used as the precursor reactants, NaF is used as the fluorine source, and HF is used to adjust the pH of a solution; ethanol is used as the solvent, and the solvothermal method is used to perform reaction at 135-145 DEG C for 15-17 hours to obtain the cubic-phase-fluorite-structure CaF2:Tb<3+> nano material with the grain size being 25 nanometers. The preparation method has the advantages that the method is simple in preparation process, low in cost and energy consumption, green, environmentally friendly, nontoxic, high in repeatability, and the like; the prepared CaF2:Tb<3+> nano material which is a light-emitting material capable of overcoming maximum conditions is excellent in green fluorescence property, capable of still keeping good light-emitting performance under high pressure and promising in application prospect in aspects such as display devices, biological probes and fluorescence labeling.

Description

technical field [0001] The invention belongs to the field of nano light-emitting materials and technology. Background technique [0002] Compared with bulk materials, rare earth-doped nano-luminescent materials show improved quantum confinement effects, red-shifted or blue-shifted spectra, broadened absorption bandwidth, and enhanced luminous intensity compared with bulk materials and many other features. Due to these unique and excellent optical properties, rare earth-doped nanoluminescent materials have been widely used in light-emitting devices, optical imaging and optoelectronic devices. [0003] There are many kinds of rare earth-doped nano-luminescent materials, and the host material is one of the important factors affecting the luminescent properties of rare-earth doping. The choice of the matrix mainly depends on the stability of the material and the phonon energy. The lower phonon energy in the matrix becomes an important factor for the high emission efficiency of...

AI Technical Summary

Problems solved by technology

[0004] In recent years, people doped CaF with rare earth 2 A lot of research has been done on the preparation and luminescent properties of nanomaterials, but mainly focused on Yb 3+ / Er 3+ , Yb 3+ / Tm 3+ Equally co-doped upconverting CaF 2 Nano-luminescent materials, while for Tb 3+ Single-doped CaF 2 There are few reports on the preparation and optical properties of nano-green fluorescent materials, especially the stability of the luminescent properties of materials under high pressure has not been reported.

Existing synthetic methods in the preparation of CaF 2 :Tb 3+ Nanomaterials have some disadvantages

For example: CaF prepared by a simple one-step hydrothermal synthesis method 2 :Tb 3+ Nanomaterials, with large grain size, cannot realize the preparation of nanocrystal grains below 50nm

And want to prepare CaF with smaller grain size 2 :Tb 3+ Nanomaterials often need to use oleylamine and oleic acid as ligands, or need to add surfactants for assistance, the preparation process is complex, and the cost is high; the preparation process using oleylamine and oleic acid also requires a large amount of toxic organic solvents, If used in production, it will have a serious impact on the environment

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