fluorescent powder prefabricated film for white light LED and preparation method thereof

Abstract

The invention provides a fluorescent powder prefabricated film for a white light LED and a preparation method thereof. The components of the film are fluorescent powder and a binding agent, and the binding agent is silica gel or epoxide resin. The preparation method comprises the following steps: weighing the fluorescent powder and the binding agent according to mass ratio of the fluorescent powder and the binding agent being 1:0.5-5, and mixing the two uniformly; coating the mixture on a macromolecular material carrier by a silk-screen printing method to form a layer of film; and then curing for 10 to 300 minutes at a temperature of between 100 and 200 DEG C to prepare the film. A single LED packaged by the film can solve the problem of poor light-emitting consistency in the same batch and different batches in a glue spotting method, and saves a sorting process in the glue spotting method; and the film is adopted to directly manufacture a whole LED, and the production efficiency can be improved and the service life can be prolonged greatly.

Description

technical field [0001] The invention relates to a fluorescent powder prefabricated film for white LEDs and a method thereof, belonging to the field of solid lighting. Background technique [0002] As a new type of solid light source, LED (Light Emitting Diode) has developed rapidly in recent years and has been widely used in large-screen display, traffic signal lights, landscape lighting, street lighting and other fields. Compared with incandescent lamps and energy-saving lamps, its main advantages are: small size, fast response, good shock resistance, long life, especially energy saving and environmental protection. [0003] Due to technical reasons, the current mainstream LED manufacturing method is blue light chip + yellow phosphor powder. The specific process is: first fix the chip on the bracket and connect the circuit; Put it in a vacuum desiccator to remove air bubbles (it takes at least 30 minutes), then apply the mixture of phosphor and silica gel to the chip (also...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a phosphor prefabricated film for white light LEDs. A single LED packaged with this film can solve the problem of poor light output consistency between the same batch and different batches in the dispensing me...