Fluorescent material emitting red and green light excited by blue light and preparation method thereof

Abstract

Belonging to the technical field of luminescent materials, the invention relates to a fluorescent material able to emit red and green lights under the excitation of blue lights and a preparation method thereof. The fluorescent material of the invention has a general chemical formula of (Na0.5+deltaK0.5-yAy)1-xPrxNbO3: phiC or (Na0.5-yK0.5+deltaAy)1-xPrxNbO3: phiC, wherein, A is one or more of Li, Na and K, C is one or more of Li, Na, K, T1 and Ag, with x greater than or equal to 0.001 and smaller than or equal to 0.01, y greater than or equal to 0 and smaller than 0.5, delta greater than or equal to 0 and smaller than or equal to 0.1, and phi greater than or equal to 0 and smaller than or equal to 0.1. Inherently with piezoelectric, ferroelectric and dielectric properties, the fluorescent material provided in the invention simultaneously has a photoluminescence characteristic when excited by blue lights. Belonging to photoelectric multifunctional materials, the fluorescent material of the invention can be applied to the white LED field, and is expected to be widely applied in the fields of optoelectronic integration, micro electromechanics, photoelectric sensing, etc.

Description

technical field [0001] The invention relates to a fluorescent material emitting red and green light excited by blue light and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] White light LED has the advantages of low energy consumption, long life, small size, light weight, good directionality, fast response, solidification, no pollution and resistance to various harsh conditions. It is known as the successor to incandescent lamps, fluorescent lamps and high-intensity gas discharge lamps. After the fourth generation of lighting sources. Since the first white LED came out in 1996, it has developed rapidly and its luminous efficiency has been continuously improved. It is expected to replace traditional lighting sources such as incandescent lamps, fluorescent lamps and high-pressure mercury lamps, and become the most promising green lighting source in the 21st century. [0003] At present, there are three mai...

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Problems solved by technology

[0004] (1) Assemble red, green and blue primary color LED chips to achieve white light. This method can adjust the color at will, but because the light output of LED devices will decrease with the increase of temperature, the degree of decline of LEDs of different colors is very different. It will cause chromatic aberration of mixed white light; and different LED chips require different power supply devices, which will lead to complex power supply and high cost, so the application of three-color LED chip assembly to achieve white light is limited

[0005] (2) Combining LED chips that emit ultraviolet light and phosphors that can be effectively excited by ultraviolet light to emit red, green and blue three primary colors to form a white LED. In addition, two primary colors, even four primary colors, five primary colors and other multi-color phosphors can also be used. , this method has the best color rendering, but the current efficiency is low

However, its color rendering index is lower compared to fluorescent lamps, mainly due to the fact that YAG:Ce 3+ Due to the weak emission in the red band of the spectrum

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