Light-emitting device

Abstract

The invention discloses a light-emitting device which is characterized in that a photon crystal is formed on a light-emitting wafer, and then a fluorescence layer is covered, so that rays ejected from the light-emitting wafer is scattered by the photon crystal and then reacts with the fluorescence layer to excite colorful lights, and then the colorful lights are subjected to light mixing, thus white lights are generated and then are sent out outside. Thus the purpose of promoting the light extraction efficiency is achieved so as to avoid the defect of poor scant luminous efficiency of the existing light-emitting device.

Description

technical field [0001] The invention relates to a light emitting device, in particular to a light emitting device which generates white light through a light emitting chip. Background technique [0002] Light emitting diode (light emitting diode, LED) as a lighting source has the advantages of small size, low energy consumption, long life, fast response, safe low voltage, good directionality, etc., and has broad application prospects in lighting and display. In recent years, the efficiency of LED has been continuously improved. As an electric light source, high-power white LED has become a popular lighting source in the industry. Combined with solar cells, which are also an environmentally friendly and sustainable source of energy, the white LED will be an ideal eco-friendly lighting. [0003] Classified by the manufacturing method of the white light source of the white light LED, it is usually possible to add YAG (Y 3 al 5 o 12 : Ce and its variable derivatives) yellow ...

AI Technical Summary

Problems solved by technology

[0003] Classified by the manufacturing method of the white light source of the white light LED, it is usually possible to add YAG (Y 3 Al 5 o 12 : Ce and its variable derivatives) yellow phosphor; however, this white LED made of blue LED chip and yellow phosphor has the following disadvantages: since blue light accounts for most of the luminescent spectrum, the color temperature The phenomenon of high and uneven occurs, so the opportunity to increase the interaction between blue light and yellow light phosphor to reduce the intensity of blue light or increase the intensity of yellow light will inevitably increase the manufacturing cost

Furthermore, because the wavelength of light emitted by blue LEDs will change as the temperature rises, it is difficult to control the color of white light sources.

3. Poor color rendition due to weak luminescent yellow spectrum

[0010] However, it is difficult to uniformly mix the phosphor powder in the phosphor layer 14' when the light-emitting chip 11' emits light in all directions, which makes it difficult to control the color of the white light source.

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