一种防硫化TOP框架的研究

A Study of Vulcanization Prevention Frame

目前,LED照明市场SMD LED光源使用框架主要包括2835、3014、5730等。这些框架表面镀高反射镀层是银。银是一种很活泼的金属,很容易发生氧化和硫化,导致LED光源内部发黑,甚至死灯。LED光源封装所用硅胶都采用高折率(n=1.5)的硅胶,高折射率(n=1.5)封装硅胶气密性好,可有效隔绝空气中的O、S元素对框架表面银层攻击,但仍具有一定局限性,当空气中O、S元素元素很丰富时,长时间仍会渗入框架内部,引发硫化、氧化问题,进而导致器件失效。新防硫化框架在银层上又增加一层TiO_(2)和AL_(2)O_(3)组合防硫化镀层设计,实验结果表明,TiO_(2)和AL_(2)O_(3)组合的防硫化镀层可提高表面反射率,阻隔空气中O、S元素进入框架内部与银发生化学反应,提升贴片LED光源的可靠性。

At present,the LED lighting market SMD LED light source used by the frame mainly includes 2835,3014,5730 and other specifications.These frame surface plating high reflection layer are metal silver.Silver is a very active metal,it is easy to oxidation and sulfidation,easy to lead to the LED light source internal black,and even dead lights.LED light source encapsulation silica gel are used in high refractive index(n=1.5)silica gel,high refractive index(n=1.5)encapsulation of silica gel airtight,can be effectively insulated from the air in the O,S elements of the framework of the surface of the silver layer attack,but still has certain limitations,when the air in the O,S However,it still has some limitations,when the O,S elements in the air is very rich,it will still enter the frame for a long time,which will lead to sulphurisation and oxidation problems,and then lead to the failure of the device.The new anti-sulfuration frame adds a layer of TiO_(2) and AL_(2)O_(3) combination of anti-sulfuration coating design on the silver layer,and the experimental results show that the new TiO_(2) and AL_(2)O_(3) combination of anti-sulfuration coating can improve the surface reflectivity,and at the same time block the O,S elements in the air to enter the frame inside the chemical reaction with the silver,to further enhance the reliability of the SMD LED light source.