A kind of LED fluorescent transparent polycarbonate grating and preparation method thereof

Abstract

The invention discloses a light emitting diode (LED) fluorescent transparent polycarbonate grating and a production method thereof. The method comprises the following steps of: material screening, preparing, mixing, drying, preparing additives, mixing, smelting, forming, annealing, etching and packaging, wherein the forming step, uniformly-mixed fluorescent polycarbonate obtained by melting is directly subject to injection molding in a mold in a bead shape by using a twin-screw extrusion method. According to the method, the direct injection molding method is used to save the step of polishing, so that the transmittance rate cannot be reduced by polishing; laser cutting in the prior art is omitted, so that a fluorescent material cannot lose the activity at high temperature; because the thickness is large, so that the fluorescent material can be prevented from losing the activity to the maximum extent; and the fluorescent transparent polycarbonate sheet surface etching grating can solve the problems of glare and uneven light distribution of an LED. The LED fluorescent transparent polycarbonate grating and the production method thereof can be widely applied in the field of the LEDs.

Description

technical field [0001] The invention relates to the field of LEDs, in particular to an LED fluorescent transparent polycarbonate grating and a preparation method thereof. Background technique [0002] White LED is considered as a "green lighting source" because of its significant advantages such as high efficiency, low power consumption, long life, solid-state energy saving, and environmental protection. It is expected to become the third generation of lighting source after incandescent lamps and fluorescent lamps. development potential. At present, domestic enterprises generally adopt high-power white LEDs, mainly by adding phosphor powder on blue LED chips to achieve white light. However, it is difficult to control the coating thickness and shape of phosphor powder in this packaging process, resulting in the uniformity of color temperature of LED devices. Still not ideal, even the angular color temperature difference of a single LED can be as large as 800K, while the colo...

AI Technical Summary

Problems solved by technology

At present, domestic enterprises generally adopt high-power white LEDs, mainly by adding phosphor powder on blue LED chips to achieve white light. However, it is difficult to control the coating thickness and shape of phosphor powder in this packaging process, resulting in the uniformity of color temperature of LED devices. Still not ideal, even the angular color temperature difference of a single LED can be as large as 800K, while the color temperature difference that human eyes can distinguish is 50-100K

On the other hand, the existing LED lamp beads / luminaires generally use the LED light source to emit directly into the lighting space (usually the ground). Because the light emitted by the LED is not uniform, it is more irritating to the human eye and seriously affects the LED lamp. The lighting effect is easy to cause visual fatigue or even vision loss. This is the light pollution that often exists in LED lamp beads / luminaires - the glare problem

[0003] Chinese invention patent CN102337017A discloses a polycarbonate composition with LED light conversion function and its application, which is characterized in that polycarbonate resin, additives (additives include: phosphor, flame retardant, antioxidant, mold release agent, weather resistance agent) mixed in a certain proportion and melted and extruded by a screw extruder. There are no coupling agents and dispersants in these additives, which will lead to uneven dispersion of phosphor powder during the extrusion molding process, resulting in polycarbonate The light transmittance of the ester composition decreases, it is difficult to obtain a light conversion material with excellent performance, and it will adversely affect the optical performance of the material after long-term use

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