LED lamp with double layers of fluorescent powder

Abstract

The invention relates to an LED lamp with double layers of fluorescent powder. Blue light emitted by a blue light LED chip emitting blue light irradiates nitrides or nitric oxide fluorescent powder on an inner layer firstly, wherein the wave band of the blue light ranges from 430 nm to 467 nm; and light with the shorter wave band, like purple light with the wave band of 380 nm to 420 nm is motivated to irradiate YAG or silicate or LGA fluorescent powder again, and therefore ideal white light is obtained. According to the LED lamp, on the one hand, through motivation of the nitrides or the nitric oxide fluorescent powder on the inner layer, a light source large than an original wafer by several times, shorter in wave band and higher in penetrating capability is obtained; and on the other hand, the YAG or the silicate or the LGA fluorescent powder is motivated again, and the motivation effect of the light source is redoubled.

Description

technical field [0001] The present invention generally relates to white light LED lighting devices. More specifically, the present invention relates to an LED lamp that uses double-layer phosphors to excite twice to obtain ideal warm white light. Background technique [0002] With the development of technology, more and more white LED lamps are used in the field of general lighting. Compared with existing incandescent lamps, white LED lamps have the advantages of small size, low calorific value, low power consumption, long life, fast response, and environmental protection, so they have good development prospects. [0003] Currently, a combination of multiple monochromatic LED chips or a combination of monochromatic LED chips and phosphors are usually used to generate white light with different color rendering indices. For example, a combination of red chips, blue chips and green chips, or a blue chip coated with yellow phosphor (such as YAG phosphor) can be used to generat...

AI Technical Summary

Problems solved by technology

For example, a combination of red chips, blue chips and green chips, or a blue chip coated with yellow phosphor (such as YAG phosphor) can be used to generate white light, but the production cost of the former is relatively high, which is not conducive to popularization and application. , while the white light produced by the latter has a relatively low color rendering index and the phosphor is easy to age

Practice has proved that although YAG phosphors have been used for almost 20 years, until now the light excited by YAG phosphors alone still cannot obtain ideal warm white light (its color rendering index is only about 70)

[0004] In addition, at present, LED chips with small area are usually used to directly excite phosphors coated on its surface or on the outer shell to obtain white light, which limits the effective light-emitting area and luminous intensity of LED lamps.

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