A class of praseodymium-doped borate red light-emitting materials and preparation method and use thereof

Abstract

The invention discloses a praseodymium doped borate red luminescent material and a preparation method and applications thereof. The chemical formula of the luminescent material is ARB7O13:Pr3+; wherein A represents one or more of Mg, Ca, Sr, Ba, Cu, and Zn, and R represents one or more of Al, Sc, La, Gd, Y, and Bi. The properties and luminescent performance of the luminescent material are stable at a high temperature. The invention also discloses a preparation method of the praseodymium doped borate red luminescent material, the preparation technology is simple and is suitable for large scale industrial production, and the cost is low. The luminescent material can be applied to the fields such as white light LED illumination, display technology, and the like.

Description

technical field [0001] The invention relates to the technical fields of red luminescent material and white LED lighting and display, in particular to a class of praseodymium-doped borate red luminescent material and its preparation method and its application in white LED lighting and display technology. Background technique [0002] White LED is a new type of green solid-state lighting source with unlimited application potential. Compared with other energy-saving lamps and incandescent lamps, white LED has the advantages of low operating voltage, low power consumption, high reliability, long life, no pollution and high efficiency. The series of good characteristics are also the research focus of solid-state lighting sources. Phosphor powder is one of the main components in white LED solid-state lighting sources. The performance of phosphor powder determines key technical indicators such as LED luminous efficiency, color rendering index, color temperature and service life. T...

AI Technical Summary

Problems solved by technology

[0004] The first is to realize white light emission through the combination of red, green and blue primary color LED chips. However, to realize LED white light output through this method needs to consider the driving characteristics of three different LED chips, which leads to complex circuit design of the light source.

The second is the integrated single-chip method, also known as the multi-quantum well method, which uses multiple active layers on a single chip to make the LED chip emit white light directly. The main defect of this method is the single-chip growth of multiple active layers. Complex technology and difficult control

The third method is the phosphor conversion method. There are two ways to achieve this method. One way is to excite the red, green and blue primary color phosphors through ultraviolet or near ultraviolet LEDs to achieve white light emission. There are also many such schemes. Defects are mainly reflected in: there is a significant difference in the aging degree of the three phosphors, resulting in a shift in the color coordinates of white light; at the same time, the phosphors of the three primary colors will absorb each other, especially the absorption of red light by blue-green phosphors, which will cause The luminous efficiency is significantly reduced; finally, the stability of the phosphor powder under ultraviolet light excitation is not good, resulting in low lumen efficiency of white LEDs

From these reports it can be found that although Pr 3+ Doped oxides can obtain red light output under the excitation of blue LEDs, but the luminous efficiency of praseodymium ions is not high. At the same time, due to the rich energy levels of praseodymium ions, there are problems such as reabsorption in the fluorescence emission between each energy level, so praseodymium ion doping Miscellaneous red luminescent materials are difficult to be widely used in white LEDs, and related research needs further exploration