Graphene-coated fluorescent material for LED

Abstract

According to the graphene-coated fluorescent material for the LED, the graphene-coated fluorescent material growing on the surface of fluorescent powder through a chemical vapor deposition method can achieve efficient preparation and high-precision control, and therefore the product performance and reliability are improved. In addition, the adopted graphene material is single-layer graphene, so that the cost is reduced, and the stability and efficiency of the coating material are ensured. The novel graphene-coated fluorescent material provides a more excellent solution for an LED due to high luminous efficiency and stability of the novel graphene-coated fluorescent material. For the LED industry, the innovative material can greatly promote the progress and development of the industry.

Description

Technical Field

[0001] The invention relates to the technical field of semiconductor lighting, in particular to a material for light emitting diodes (LEDs). Background Art

[0002] LED (Light Emitting Diode) is a highly efficient, energy-saving and environmentally friendly semiconductor lighting device, which is widely used in indoor lighting, display screens and other fields. In LED, commonly used luminescent materials include phosphors, etc. However, in actual use, high temperature will cause the surface of the LED to expand and contract, thereby promoting microcracks and causing the LED phosphor to contact the air. Under high temperature, the phosphor reacts with the air and degrades, thereby affecting the luminous performance of the diode. In order to improve the luminous efficiency and stability of the LED, it is usually necessary to coat the phosphor surface with a layer of material. However, there are some problems with existing coating materials, such as insufficient adhesion with the phosphor and the color of the coating material itself. Therefore, it is necessary to develop a new coating material to solve the above problems. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a graphene-coated fluorescent material for LED.

[0004] The specific plan is as follows:

[0005] A graphene-coated fluorescent material for LEDs, wherein the graphene-coated fluorescent material is a graphene material coated on the surface of a fluorescent powder grown by a chemical vapor deposition method.

[0006] Furthermore, the fluorescent powder is barium disilicate.

[0007] Furthermore, the graphene material is single-layer graphene.

[0008] Beneficial effects:

[0009] 1. A new graphene-coated fluorescent material for LED is provided, which has high light efficiency and stability.

[0010] 2. The graphene-coated fluorescent material is grown by chemical vapor deposition, which can achieve efficient preparation and high-precision control of the coating material, thereby improving the performance and reliability of the product.

[0011] 3. The graphene material is a single-layer graphene, which can effectively reduce the cost of the material while ensuring the stability and efficiency of the coating material. DETAILED DESCRIPTION

[0012] The present invention will now be further described in conjunction with specific implementation methods.

[0013] The specific implementations of the present invention are as follows, but a person skilled in the art can obtain other implementations based on this.

[0014] Embodiment 1:

[0015] The invention provides a graphene-coated fluorescent material for LEDs. The graphene-coated fluorescent material is a graphene material coated on the surface of fluorescent powder grown by a chemical vapor deposition method.

[0016] As a preferred solution of the present invention, the fluorescent powder is barium bisilicate.

[0017] As another preferred embodiment of the present invention, the graphene material is single-layer graphene.

[0018] The manufacturing process of the above-mentioned graphene-coated fluorescent material for LED includes the following steps:

[0019] 1. Preparation of barium silicate phosphor;

[0020] The barium silicate phosphor can be prepared in the following manner: a certain amount of barium oxide, sodium silicate, boric acid and potassium sulfate are mixed evenly in a certain proportion, and sintered under high temperature and high pressure conditions to obtain the barium silicate phosphor.

[0021] 2. Use chemical vapor deposition to coat a single layer of graphene material on the surface of barium silicate phosphor;

[0022] (1) Place the phosphor in a reaction furnace and use a mechanical pump to evacuate the furnace until the vacuum degree reaches below 1 Pa;

[0023] (2) Raise the temperature in the furnace to 300-500°C and keep the temperature constant at 300-500°C for 5-10 minutes;

[0024] (3) When the temperature is 300-500°C, methane and hydrogen are introduced into the furnace to excite microwave plasma at the same time, wherein the methane flow rate is 10-20 sccm and the hydrogen flow rate is 10-40 sccm, and the temperature is maintained for 10-30 minutes.

[0025] 3. After the heat preservation is completed, the temperature is naturally cooled to room temperature to obtain the graphene-coated phosphor.

[0026] The present invention adopts plasma enhanced chemical vapor deposition technology to coat a layer of graphene material on the surface of the existing low-cost phosphor. The graphene material can effectively isolate water vapor and has excellent thermal stability, thereby improving the high-temperature stability of the phosphor.

[0027] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A graphene-coated fluorescent material for LED, characterized in that: The graphene-coated fluorescent material is grown on the surface of fluorescent powder by chemical vapor deposition.

2. The graphene-coated fluorescent material for LED according to claim 1, characterized in that: The fluorescent powder is barium disilicate.

3. The graphene-coated fluorescent material for LED according to claim 1, characterized in that: The graphene material is single-layer graphene.