LED fluorescent film manufacturing method

Abstract

The invention discloses an LED fluorescent film manufacturing method. According to the LED fluorescent film manufacturing method, a fluorescent film is attached to an LED device through adopting a sol-gel method or a spraying method; organic components which are not led in a preparation process are removed from an obtained determined fluorescent film; and therefore, the physicochemical properties of the fluorescent film can be improved, and requirements of a follow-up packaging process, for the physicochemical properties of a fluorescent powder layer, can be better satisfied. With the fluorescent film adopted, the heat dissipation of an LED can be improved, and the service life of the LED device can be prolonged; unevenness of the concentration of fluorescent powder in silica gel or resin can be avoided, and the improvement of the consistency of LED products can be benefitted; and at the same time, the fluorescent film has favorable flexibility and mechanical strength, and the surface-mount process of the fluorescent film is simple, which is greatly beneficial to the batch production of planar LED devices.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a method for preparing a fluorescent fluorescent film on the light emitting surface of an LED chip. Background technique [0002] In recent years, whether it is inorganic or organic light-emitting devices (LED / OLED), white LED devices and their application research in lighting-related fields have received great attention from both academic and industrial circles. There are two main ways for white LEDs to produce white light: the first It is to combine red, green, and blue LEDs to produce white light; the second is to use LEDs to excite light conversion phosphors and mix them to form white light. There are two implementations for this approach, and the more mature method is blue LED chip and ( Such as YAG: Ce3+, etc.) with yellow phosphor to achieve white light emission. [0003] For photoconverted white LEDs, the structure and characteristics of the phosphor coating have...

AI Technical Summary

Problems solved by technology

[0005] However, the structure of the phosphor layer obtained in this way has several disadvantages: 1. The phosphor powder mixture will be affected by the shape of the cup mouth of the bracket, resulting in a yellow or blue circle; 2. The way of dispensing is to use gravity to make the phosphor powder The mixed liquid with the colloid will wrap the LED chip after flowing, so the uniformity on the LED light-emitting surface cannot be achieved; the above shortcomings will lead to poor uniformity of the LED light output

3. The repeatability of the phosphor layer between devices is poor, which greatly restricts mass production and yield

Images