Light-emitting device and preparation method thereof

Abstract

The present invention provides a light-emitting device and a preparation method thereof. The components of the light-emitting device comprise fluorescent powder and a binder for bonding. The light-emitting device is an integrated sintered body comprising a light-emitting layer and a functional layer laminated on the light-emitting layer; the light-emitting layer includes a first light-emitting layer; the mass fraction of the fluorescent powder in the first light-emitting layer ranges from 50% to 99%; the thickness of the first light-emitting layer ranges from 150 to 200 microns; the functionallayer includes a first functional layer; the mass fraction of the fluorescent powder in the first functional layer ranges from 5% to 50%; the thickness of the first functional layer ranges from 5 to50 microns; a continuous dense transition layer is arranged between the light-emitting layer and the functional layer; and the Moh's hardness of the fluorescent powder is different from the Moh's hardness of the binder. With the light-emitting device and the preparation method thereof of the invention adopted, the problem of difficulty in film plating caused by the inconsistency of the polishing flatness of a multiphase material light-emitting device can be solved; the inter-layer porosity of the light-emitting device is low, so that the phenomenon of sintering detachment can be avoided; and therefore, the reliability of the light-emitting device can be improved, and the yield of finished products can be improved.

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 new 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 an...

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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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