At present, blue, green and blue-green LEDs produced so far adopt adopt chips made with GaN-based sapphire substrate and MOCVD technology. The characterizes of this chip are: good brightness, relatively mature technology, relatively few patent conflict. The shortcoming of the chip is: Poor anti-static ability, static shock will result in high Vf (positive pressure drop), low brightness or even broken LED, therefore, how to prevent static electricity is blue and green light-emitting diode’s main problems in the production and use.
The performance of electrostatic wounded：Chips wounded by electrostatic will form the black spot on the surface, this black spot will not shine again. So, a vary degrees of wounded chip, its performance is also different. Slight wounded, may looks not come out on the surface, but a small amount of brightness will decay, IR values (reverse current) rise; Moderate wounded chip, the pipe pressure drop significantly elevated (could rise to more than 4.0 V ~ 5.5 V), brightness significantly reduce (below the normal brightness of 50%), IR, seriously affect the life, in the process of using will gradually lose function, finally can also cause death lamp.
Blue and green light-emitting tube anti-static electricity ability level at present: Antistatic ability only about 50 v, reverse electrostatic more than 500 v will immediately lead light to die; Positive electrostatic in more than 1500 v will immediately lead to a serious injury, and in the north winter, the human body electrostatic around 1000 v to 1500 v, so, the human body direct contact with the diode is a major cause of lead to diode damage. In any production, the process of using diode, shall be strictly forbidden human body in the absence of anti-static measures to direct contact with the diode.
Diode production adopts certified diode chip, under the condition of strict production (dust-free, anti-static) product diodes, production standard and leakage standard (IR) should strictly control in 5 v, 10 muA standard, industry standard is 5 v, 50 muA in the whole process of production, testing, packaging, all automated, completely avoid the effect of artificial factor, to ensure product quality.