Light emitting device and manufacturing method thereof

Abstract

A light emitting device (10) and a manufacturing method therefor. The components of the light emitting device include fluorescent powder and binder functioning to bind. The light emitting device (10) is an integrated sintered body comprising a light emitting layer (11) and a function layer (12) stacked on the light emitting layer (11); the light emitting layer (11) comprises a first light emitting layer (111), the mass fraction of the fluorescent powder of the first light emitting layer (111) being 50%-99%, and the thickness of the first light emitting layer (111) being 150-200 μm; the function layer (12) comprises a first function layer (121), the mass fraction of the fluorescent powder of the first function layer (121) being 5%-50%, and the thickness of the first function layer (121) being 5-50 μm; a continuous dense transition layer is located between the light emitting layer (11) and the function layer (12); and the Moh's hardness of the fluorescent powder is different from that of the binder. The present invention resolves the problem of a light-emitting device of multiphase material being difficult to coat with a film due to the inconsistent polishing flatness thereof, and meanwhile the porosity between layers is relatively low, further avoiding sintering detachment and improving reliability and finished product yield of the light emitting device.

Description

technical field [0001] The invention belongs to the field of optical technology, and in particular relates to a light-emitting device and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of high-quality green lighting and high-end display technology, the application of high energy density excitation methods such as laser diodes (laserdiodes, LD) and high-power white LEDs has put forward challenges for the radiation resistance and structural stability of fluorescent materials. Due to higher requirements, light wavelength conversion materials with phosphor powder and silica gel as main raw materials have been widely used in laser light sources and LED (Light Emitting Diode, light emitting diode) light sources. As people's requirements for brightness continue to increase, the optical power of the excitation light is also getting higher and higher. This kind of light wavelength conversion sheet made of phosphor powder and si...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above deficiencies in the prior art, the present invention proposes a light-emitting device with a gradient concentration. By controlling the mass fraction and distribution of the fluorescent material in each layer, a low-concentration layer is designed. The "relief" structure of the coating interface caused by the different hardness of the bonding medium increases the difficulty of the coating process; on the other hand, the porosity between the interfaces of each concentration layer of this structure is low, and there is no excessive concentration difference. Avoid quality problems such as cracking, peeling and falling off caused by the large difference in expansion coefficient during the sintering process;

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