Silicon nitride orange red luminescent material for low color temperature white LED and preparation method thereof

Abstract

The invention belongs to the technical field of photoelectric materials, and relates to a Eu<2+> doped silicon nitride orange red luminescent material for a blue light-excitated white light-emitting diode (LED) and a preparation thereof. Chemical components of the Eu<2+> doped silicon nitride orange red luminescent material meet a chemical general formula, namely Si3N4:xEu<2+>,yAl, wherein x is more than or equal to 0.0005 and is less than or equal to 0.1; and y is more than or equal to 0 and is less than or equal to 0.2. The Eu<2+> doped silicon nitride orange red luminescent material is simple in preparation technology and low in cost; and the material emits orange red light with the wavelength of between 500 and 700nm under the excitation of blue light with the wavelength of between 400 and 450nm, and the emission peak value is 565nm. Because the emission bandwidth of the material covers partial red light area, the material contains more red light components compared with YAG:Ce<3+> yellow phosphor powder; in the meanwhile, a silicon nitride matrix has excellent thermal stability and chemical stability, so that the Eu<2+> doped silicon nitride orange red luminescent material has potential application prospect on low-color-temperature high-power white LEDs.

Description

Silicon nitride orange-red luminescent material for low color temperature white light LED and preparation method thereof technical field The invention belongs to the technical field of optoelectronic materials, and in particular relates to a Eu2+-doped silicon nitride orange-red luminescent material for white LEDs excited by blue light and a preparation method thereof. Background technique Against the backdrop of global low-carbon, energy-saving, and environmental protection, semiconductor white LED solid-state lighting technology has developed rapidly in recent years. The most common and commercial implementation of white LEDs is to use InGaN blue chips to excite YAG:Ce3+ yellow phosphors. However, due to the lack of red light components, the white LEDs obtained in this way have high color temperature and poor color reproduction, which cannot meet the lighting needs of some special occasions (such as home lighting and hospital lighting). In order to obtain white LED devi...

AI Technical Summary

Problems solved by technology

But we know that due to the high specific surface area of ​​nanomaterials, it shows severe defects and poor crystallinity, which are unfavorable factors from the perspective of light emission.

Therefore, the luminous intensity observed in nano-silicon nitride is very weak

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