White-light LED structure with high color rendering index and high light efficiency

Abstract

The invention relates to a white-light LED structure with a high color rendering index and high light efficiency. The invention overcomes some problems a low yield, mutual light absorption, low fluorescent powder utilization rate, and high cost caused by uneasily and unevenly blended fluorescent powders of LEDs using fluorescent layers made of blended fluorescent powders in the prior art. The present white-light LED structure comprises a bowl with a light-emitting chip disposed on the bottom, and two fluorescent layers of different colors, i.e. a first fluorescent layer and a second fluorescent layer, which are disposed up and down in the same bowl or separately disposed in different bowls. An advantage of the invention is that by separating the blended fluorescent layer in the LED bowl into two separate fluorescent layers, the problem of a low yield of fluorescent layer due to unevenly blended fluorescent powders and different sedimentation rates of different fluorescent powders is solved, and also the mutual light absorption between different fluorescent powders is avoided, therefore the color rendering index is ensured.

Description

technical field [0001] The invention relates to the technical field of LEDs, in particular to a white LED structure with high display index and high luminous efficiency that ensures display index and reduces cost. Background technique [0002] With the improvement of light-emitting diode (LED) chip and packaging technology, white LED is gradually favored by people as a general lighting source. It has a series of advantages such as low voltage, low power consumption, high reliability, and long life. It has been widely used in LED street lamps, LED lamps and other fields. Fluorescent and incandescent lamps dominate the lighting field. [0003] However, the color rendering of white LEDs is a technical bottleneck that restricts them from entering into indoor lighting, especially reading lighting and medical lighting. For a long time, people have used the combination of InGaN-based blue LED chips and Ce3+-activated rare earth garnet (YAG:Ce3+) yellow phosphor to prepare cool w...

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Problems solved by technology

[0008] The present invention mainly solves the problems that LEDs in the prior art use a fluorescent layer mixed with fluorescent powder, which is difficult and uneven in mixing fluorescent powder, resulting in low yield of finished products, mutual light absorption, low utilization rate of fluorescent powder, and high cost. Provides a high display index and high luminous efficiency white LED structure that guarantees display index and reduces cost

The present invention separates the mixed fluorescent layer in the LED bowl into two independent fluorescent layers, and arranges the two fluorescent layers successively in the bowl or independently in different bowls, which solves the problem that the mixed fluorescent layer is not mixed due to the phosphor powder. Uniformity, and the precipitation rate of different phosphors is different, which causes the problem of low yield rate of the phosphor layer. At the same time, it also avoids the problem of mutual light absorption between different phosphors, ensuring the color rendering index

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