Remotely-excited fluorescent polycarbonate composite material and preparation method thereof

Abstract

The invention discloses a remotely-excited fluorescent polycarbonate composite material and a preparation method thereof. The remotely-excited fluorescent polycarbonate composite material is prepared from 93 to 99 parts of polycarbonate, 0.5 to 1 part of an organosilicone photodiffusion agent, 3 to 5 parts of fluorescent powder, 0.2 to 0.4 parts of an anti-oxidant, 0.1 to 0.2 parts of a lubricant and 0.3 to 0.5 parts of a light stabilizer. The preparation method comprises the following steps of 1, uniformly stirring the organosilicone photodiffusion agent, the anti-oxidant, the lubricant and the light stabilizer by a high-speed mixer, 2, putting polycarbonate and the uniform mixture obtained by the step 1 into the high-speed mixer together, and carrying out uniform stirring, and 3, adding the uniform mixture obtained by the step 2 into a twin-screw extruder in a main feeding way, adding the fluorescent powder into the twin-screw extruder in a side feeding way, and carrying out extrusion granulation to obtain the remotely-excited fluorescent polycarbonate composite material. The remotely-excited fluorescent polycarbonate composite material can be used for preparation of a LED lampshade. The LED lampshade has a certain distance from a LED luminous chip so that the fluorescent powder is excited remotely. The remotely-excited fluorescent polycarbonate composite material has stable performances and uniform color temperatures, and greatly prolongs a LED lamp service life. The preparation method has the simple processes.

Description

technical field [0001] The invention relates to the technical field of polymer fluorescent materials, in particular to a remote excitation fluorescent polycarbonate composite material and a preparation method thereof. Background technique [0002] LED light source is the abbreviation of light-emitting diode, which has the advantages of high brightness and low energy consumption. At present, white light LED has begun to enter the stage of industrial application. There are three main methods of using LED technology to realize white light: ① Assemble red, green, and blue primary color LED chips together to achieve white light. The disadvantage of this method is that it is easy to cause the color coordinate drift of mixed white light; The yellow-emitting phosphor YAG: Ce that can be effectively excited by blue light is combined to form a white LED. Part of the blue light is absorbed by the phosphor, and the phosphor is excited to emit yellow light. The emitted yellow light is mi...

AI Technical Summary

Problems solved by technology

LED chips coated with phosphors have heat dissipation problems. Long-term heat accumulation will lead to a decrease in the light efficiency of LED chips. The aging of phosphors will also lead to a shift in the color temperature of light, which cannot produce the soft white light required for lighting, resulting in lighting effects. the deterioration of

The aging phosphor powder after packaging cannot be replaced, so the phosphor powder with a short service life determines the service life of the lamp, and cannot give full play to the advantages of the long luminous life of the LED chip

[0004] The fundamental problem of the existing technology lies in the heat generation and heat dissipation of the LED chip. By improving the luminous efficiency of the LED chip, the calorific value can be reduced, but the technology is difficult and the progress is slow. There is a physical limit, there must be a considerable part of the energy dissipated in the form of heat

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