A kind of preparation method of fluorescent sheet for LED

Abstract

The invention provides a method for preparing a fluorescent slice for an LED. The method mainly comprises the steps of forming a photoresist rubber column which is consistent with an LED chip electrode in size on an UV film, painting a layer of fluorescent powder glue on the UV film provided with the photoresist rubber column, removing the photoresist rubber column to form a fluorescent slice, and cutting the fluorescent slice into fluorescent slice products in specific size and shape. By adopting the method provided by the invention, the manufactured plane slice has good light-emitting uniformity and good flexibility, the thickness of the fluorescent slice is easy to control, the method belongs to the planarization process, and is suitable for integrated large-scale production. According to the method provided by the invention, the traditional method of mixing fluorescent powder with silica gel / resin and then coating the mixture on the LED chip is changed, the fluorescent slice is manufactured in an independent form, and the fluorescent slice is directly packaged with the LED chip when in use, thereby being more conductive to heat radiation of the LED chip, and prolonging service life of the LED device.

Description

technical field [0001] The invention belongs to the field of semiconductor preparation, and in particular relates to a method for preparing a fluorescent sheet for an LED. Background technique [0002] In recent years, whether it is inorganic or organic light-emitting devices (LED / OLED), white LED devices and their applications in lighting-related fields have received great attention from both academic and industrial circles. There are two main ways for white light LEDs to produce white light: the first is to combine red, green and blue LED chips to produce white light; the second is to use LEDs to excite phosphors to form white light, which is a relatively mature way It uses blue LED chips with yellow phosphors (such as YAG:Ce3+, etc.) to achieve white light emission. [0003] For photoconverted white LEDs, the structure and characteristics of phosphor coatings have a crucial impact on the performance of white LEDs. At present, the process of preparing this type of phosph...

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Problems solved by technology

[0008] However, the above process has the following disadvantages: 1. The fluorescent powder mixture will be affected by the shape of the cup mouth of the bracket, resulting in a yellow or blue circle phenomenon, which affects the quality of light output; 2. The way of dispensing is to use gravity and other mechanical effects to mix the phosphor powder. After the liquid flows to wrap the LED chip, it is difficult to ensure the uniformity of the phosphor coating, which affects the uniformity of light emission; 3. The repeatability of the phosphor coating coated on the LED chip is poor, which greatly restricts mass production and Yield

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