A LED light source that excites fluorescent powder on multiple surfaces

Abstract

An LED light source capable of stimulating fluorescent powder on multiple faces comprises a transparent multi-face carrier and first LED chip sets emitting first pump light. The first LED chip sets are arranged on the bottom face of the multi-face carrier and at least one side face of the multi-face carrier. First optical thin film layers enabling the first pump light to be transmitted highly are arranged on the outer surfaces of the bottom face and the side face, provided with the first LED chip sets, of the multi-face carrier, and a second optical thin film layer enabling the first pump light to be reflected highly is arranged on the outer surface of the other side face opposite to the side face with the first LED chip set. Fluorescent powder layers are arranged on the inner surfaces of the multi-face carrier and are used for absorbing the first pump light emitted from the bottom face and the side face and stimulating fluorescence out, and the fluorescence is emitted out through the opening or the top face of the multi-face carrier. According to the LED light source capable of stimulating the fluorescent powder on the multiple faces, a traditional single-face stimulating fluorescent layer is expanded to the at least two faces of the fluorescent layers through the mode of mounting the LED chip sets on the multiple faces, and thus the emitted brightness of the fluorescence is improved under the condition that the area of the LED light source remains unchanged.

Description

technical field [0001] The invention relates to a light source, in particular to an LED light source for multi-faceted excitation of fluorescent powder. Background technique [0002] Existing low-cost LED light sources usually use fluorescent conversion technology, that is, LED chips cooperate with phosphors to produce white light. The main principle is: phosphors absorb light emitted by LED chips and are excited to emit light of another wavelength. At present, the main form of expression is to directly coat the phosphor on the surface of the chip. This method is often used in blue LED chips with yellow phosphor to produce white light. However, the LED light source with this structure has the following disadvantages: in a limited light-emitting area, the excitation energy of the phosphor is relatively low, which cannot produce sufficient white light output, thus limiting the improvement of the brightness of the LED light source. Contents of the invention [0003] In view ...

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Problems solved by technology

However, the LED light source with this structure has the following disadvantages: in the limited light-emitting area, the excitation energy of the phosphor is relatively low, and cannot produce sufficient white light output, thus limiting the brightness improvement of the LED light source

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