White light emitting diode and white light emitting diode lamp

Abstract

The invention discloses a white light emitting diode with high color rendering property and a white light emitting diode lamp. The white light emitting diode comprises a heat conducting substrate, a light reflecting cup, a light emitting diode chip and a lead wire frame, wherein the light reflecting cup plays a light mixing role, and small protrusions are arranged on the inner wall surface of the light reflecting cup; the light emitting diode chip outputs at least six lights in different colors and is arranged on the heat conducting substrate to carry out electric combination; the lead wire frame is matched with the bottom of a light emitting cup in shape and size, arranged outside the light reflecting cup, and fixed on the upper surface of a base; an electrode of the chip is electrically connected with a lead wire on the lead wire frame, and a transparent optical material is covered on the chip; and polychromatic lights are evenly mixed through the diffuse reflection of a reflecting wall of the light reflecting cup to produce the white light emitting diode with high color rendering property and high efficiency. By applying the white light emitting diode lamp made of the white light emitting diode and a flat light source, the white light emitting diode lamp eliminates the light energy loss of fluorescent powder in the photochromic conversion process, thereby having high electro-optical conversion efficiency, long service life and convenient batched production.

Description

technical field [0001] The invention relates to a light-emitting diode (hereinafter referred to as LED), in particular to a light-emitting diode chip with more than six different colors, which are placed in a light-mixing reflective cup for electrical combination, and multiple colors The light is uniformly mixed into a white light-emitting diode with high color rendering, and a white light-emitting diode lamp made of the light-emitting diode. Background technique [0002] At present, the white light-emitting diodes seen in the market are made by mixing blue light and phosphor powder. The blue light is produced by the light-emitting diode chip with an emission wavelength of 450-470nm, and the phosphor powder absorbs blue light and emits yellow-green light. It is made by this method. Due to the lack of red light components, light-emitting diodes have a low color rendering index, and it is difficult to replace the light source of general lighting. [0003] There are several ot...

AI Technical Summary

Problems solved by technology

Since the light-emitting diode chip emits monochromatic light, the half-power wave width is about 20nm, and the color mixing agent cannot change the composition of the spectrum, but can only mix the light. Therefore, the spectrum of this light-emitting diode has three discrete peaks and cannot form a continuous spectrum. Therefore, it is difficult to form a high color rendering light source, and the diffuse reflection formed by the color mixing agent causes serious light loss

[0005] B. In June 1998, the United States proposed a design method (such as document CN1185042A). According to the article, first set the required color rendering index, then use the formula of chromaticity to calculate the excellent coordinates, and then calculate using three chips Or when four chips form a system, each chip should have a wavelength, and then calculate the amplitude of each wavelength; however, this design method cannot be used for actual white LED production because:

[0006] 1) This design method can only be effective for four chips at most, there is no definite solution for more than four chips, and it is difficult to achieve high color rendering for four chips;

[0007] 2), the solution provided by this method, the obtained wavelength is not a product that can be mass-produced by light-emitting diode chip factories, so in fact, the current mass-produced chips still cannot achieve the expected color rendering. In addition, more in this document There is no technical solution for how to mix several kinds of light into white light;

[0008] 3) In this document, there is no public record of the structure of an actual light-emitting diode, so a technical solution for the operation of a white light-emitting diode cannot be obtained from this design method

[0009] C. Use ultraviolet light to excite three primary color phosphors: this method is the same as fluorescent lamps in principle, but first of all, in the packaging process, ultraviolet light will inevitably leak, which will cause harm to the human body; secondly, the wavelength of the current ultraviolet light-emitting diode is quite long , the efficiency of exciting the three primary color phosphors is very low, and the electro-optical conversion efficiency itself is very low, resulting in the low efficiency of the entire light-emitting diode, which is not yet practical.

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