A kind of single-band red light nanocrystalline material and preparation method thereof

Abstract

The invention belongs to the field of inorganic luminescent materials. The chemical formula of a single-spectrum red-light nanocrystalline material is Yb / Er: Na3HfF7(at)Yb: Na3HfF7(at)Yb / Nd: Na3HfF7.According to the single-spectrum red-light nanocrystalline material, non-radiative energy transfer between Er<3+> and Nd<3+> is inhibited by the utilization of Yb: Na3HfF7 intermediate layer; and by the utilization of high absorption cross-section of Nd<3+> to 808 nm excitation waveband and characteristic of cluster distribution of rare earth ions in a Na3HfF7 matrix, single-spectrum red-light emission of Er<3+> under the condition of 808 nm excitation is realized.

Description

technical field [0001] The invention belongs to the field of inorganic light-emitting materials, in particular to single-band up-conversion red light nanocrystal materials. Background technique [0002] The research results show that the up-conversion luminescent nanomaterials have no spontaneous background fluorescence, flash and light fading in the process of cell imaging, which is beneficial to reduce the detection background, improve the signal-to-noise ratio, and then improve the sensitivity and spatial resolution of biological imaging. At present, the most widely studied up-conversion luminescent nanomaterials are rare earth ion-doped fluoride systems that produce multi-band emission under the excitation of a 980nm laser. They have many shortcomings in the field of biological imaging, mainly as follows Point: First, although the excitation light source is located in the near-infrared region, which can achieve a large penetration depth, the commonly used up-conversion l...

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Problems solved by technology

At present, the most widely studied up-conversion luminescent nanomaterials are rare earth ion-doped fluoride systems that produce multi-band emission under the excitation of a 980nm laser. They have many shortcomings in the field of biological imaging, mainly as follows Point: First, although the excitation light source is located in the near-infrared region, which can achieve a large penetration depth, the commonly used up-conversion luminescent rare earth ions (Er 3+ , H o 3+ , Tm 3+ ) is dominated by green light (~550nm) or blue light (~475nm), and the red light and near-infrared light in the 600-1000nm band are relatively weak, so it is difficult for the emitted light to penetrate deeper biological tissues, and the laser Changes in power and depth of biological tissue will have different effects on different emission bands, which will lead to chromatic aberration and finally affect the biological imaging effect; second, water molecules in biological tissue have strong absorption near 980nm, resulting in 980nm The penetration depth of the laser is greatly reduced, and the water molecules in the biological tissue absorb a large amount of photon energy with a wavelength of 980nm, which will generate local heat energy and cause damage to the biological tissue

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