White-light LED for exciting gold-silver alloy clusters to emit light through blue light and preparation method thereof

Abstract

The invention discloses a white-light LED for exciting gold-silver alloy clusters to emit light through blue light and a preparation method thereof. The white-light LED comprises an insulating base, aheat conduction pad, a bowl-shaped reflector, a blue-light LED chip, a positive electrode, a negative electrode, a gold wire, an orange-red gold-silver alloy cluster, green-light fluorescent powder,silicon resin and a lens, wherein the heat conduction pad is connected with the bowl-shaped reflector and arranged in the center of the insulating base, the blue LED chip is fixed in the center of thebowl-shaped reflector and coated with the orange-red gold-silver alloy cluster layer and the green fluorescent powder layer, and the insulating base is provided with the lens and filled with the silicon resin. A glutathione aqueous solution, a chloroauric acid aqueous solution, a silver nitrate aqueous solution and a sodium hydroxide aqueous solution are uniformly stirred and fully mixed, a gold-silver alloy cluster solution is obtained through a constant-temperature stirring reaction, freeze drying is performed to obtain solid powder, and a blue-light LED chip is sequentially coated with thegold-silver alloy cluster and green-light fluorescent powder, packaged and cured. The color rendering property, stability and luminous efficiency of the white-light LED can be improved.

Description

technical field [0001] The invention relates to a white light LED and a preparation method thereof, in particular to a white light LED prepared by exciting an orange-red light gold-silver alloy cluster and a green phosphor powder to emit light by a blue light LED, and belongs to the field of semiconductor lighting and display. Background technique [0002] Semiconductor LED is a new type of solid light source, which has the advantages of energy saving, environmental protection, durability, high energy density and small size. It has been widely used in indoor and outdoor lighting, LCD backlight, large color display, landscape decoration, and automotive lights Among them, white LED is a research hotspot in the fields of lighting, display and optoelectronics. [0003] Common preparation methods for white LEDs include blue LED-excited phosphor powder, ultraviolet LED-excited phosphor powder, and combination of red, green, and blue LED chips. Various methods produce multicolor li...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the existing white light LED technology, the present invention provides a white light LED manufactured by exciting orange-red light gold-silver alloy clusters and green light-emitting phosphors by blue-light LEDs, and using orange-red light gold-silver alloy clusters to replace traditional red light phosphors , to solve the problems of low color rendering, low efficiency, narrow color gamut and poor stability of white light LEDs

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