Ytterbium and thulium double-doped calcium tungstate polycrystalline powder blue upconversion material and preparation method thereof

Abstract

The invention discloses an ytterbium and thulium double-doped calcium tungstate polycrystalline powder blue upconversion material and a preparation method thereof, and relates to a rare earth element doped calcium tungstate polycrystalline powder blue upconversion material and a preparation method thereof. The problems that the emitted light with high oneness is difficult to obtain because rare earth elements are doped in a matrix material, and the intensity of upconversion blue light generated by doping Tm<3+> is low are solved. A chemical formula of the ytterbium and thulium double-doped calcium tungstate polycrystalline powder blue upconversion material is Ca0.99-xWO4:Ybx/Tm0.01, wherein x is more than or equal to 0.01 and is less than or equal to 0.08. The preparation method comprisesthe following steps of: 1, weighing according to the stoichiometric ratio of the chemical formula; 2, grinding and tabletting; and 3, sintering at high temperature. The ytterbium and thulium double-doped calcium tungstate polycrystalline powder blue upconversion material can emit bright upconversion blue light uniformly under the condition that the laser pumping length is 980nm and the exciting power is 300mW.

Description

technical field [0001] The invention relates to a rare earth element-doped calcium tungstate polycrystalline powder blue light up-conversion material and a preparation method thereof. Background technique [0002] Up-conversion luminescence, also known as anti-Stokes luminescence, refers to the phenomenon of converting two or more low-energy photons into one high-energy photon. Up-conversion luminescence materials need to be doped with rare earth elements in the matrix. Rare earth luminescent materials have strong energy absorption capacity and high conversion efficiency; they can emit a spectrum from ultraviolet light to infrared light, especially in the visible light region. The physical and chemical properties of rare earth elements are stable, and they can withstand the effects of high-power electron beams, high-energy rays and strong ultraviolet light. However, due to the complex energy level division of most rare earth elements, doping rare earth elements in the matrix...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of doping rare earth elements in the host material, which makes it difficult to obtain light with good uniformity, and the problem of doping Tm 3+ The

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