Single-particle nano crystal with three-primary-color luminescence and preparation method thereof

Abstract

The invention provides a single-particle nano crystal with three-primary-color luminescence and a preparation method thereof. The single-particle nano crystal has a core-shell structure and sequentially comprises an inner core, a first shell, a second shell, a third shell and a fourth shell from inside to outside, wherein the inner core, the second shell and the fourth shell are luminous shells, and the first shell and the third shell are inert shells. The three luminous shells separately contain Yb<3+> / Tm<3+>, Er<3+> or Nd<3+> / Yb<3+> / Er<3+> ions, and the luminescent shells respectively radiate red, green and blue lights under the action of a laser. According to the invention, shell stock solutions with different components are continuously and thermally injected by adopting a one-pot method, and compared with a conventional batch thermal injection method, the one-pot method has the advantages that the time required for synthesizing nano particles with a multilayer core-shell structureis greatly saved. Through constructing a ''core-multi-shell'' structure, concentration quenching and luminescence color crosstalk are inhibited, and high-efficiency pure-color three-primary-color luminescence is realized. The nano crystal has a real-time color adjustment capability in full color gamut, and the adjustment method is simple and convenient.

Description

technical field [0001] The invention relates to a single-particle nanocrystal and a preparation method thereof, in particular to a single-particle nanocrystal with three primary colors of luminescence and a preparation method thereof, belonging to the field of optical materials. Background technique [0002] Rare-earth up-conversion fluorescent materials can convert low-energy near-infrared light into high-energy visible light, and are a new type of luminescent material. In recent years, rare earth up-conversion nanocrystals with polychromatic luminescent ability have made breakthroughs in the fields of display devices, biological multi-channel detection, and anti-counterfeiting. [0003] At present, the simplest solution to obtain polychromatic luminescence in upconversion nanocrystals is to dope different luminescent elements in the nanocrystals, such as the three-doped system of Yb / Tm / Er, which has red, green, and blue radiation at the same time, so it is often used Fluo...

AI Technical Summary

Problems solved by technology

However, these two methods have inherent defects: 1. Although white light nanocrystals have multiple radiation bands, the emission color cannot be adjusted; 2. The method of mixing three primary color nanocrystals can change the emission color by adjusting the ratio of different nanocrystals, But it does not have the ability to adjust the emission color in real time; in addition, different particles often have different emission colors in this method, so it is not suitable for applications that require ultra-high spatial resolution and color tunability

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