LED light failure definition and influencing factors

White LED current is a major problem facing the problem of life, due to the price of white LED is still very high, in order to gain a foothold in the lighting market, allowing users to both power and money, we must rely on long-life and savings in electricity to make light of high prices. Now, the white LED life situation makes it difficult to do this.
Normal use of terms from the LED, the most important factor affecting the life of LED is hot. Heat source, a material's resistance in the normal power generated by Joule heat, PN junction heat generated, as well as the parasitic resistance caused by process Joule heat generated, and the resulting light is attracted heat. The accumulation of heat makes the temperature, temperature makes the chip performance degradation, degradation of aging and degeneration.
1 What is the LED light failure
LED light decay products is light in the transmission of the signal weakened, and at this stage the global LED manufacturers who decline to make light of the LED lights are different, there are also high-power LED light failure, and this is directly related to temperature, the main by the chip, phosphor and packaging technologies decision. Currently, the white LED on the market may decline to its light commercial lighting into one of the most important issue.
2, the impact of two factors LED light failure
1) LED LED chip quality problems using good body, brightness decay quickly. Production process defects, LED chips heat can not export a good foot from the PIN, the chip temperature is too high to make the LED chip attenuation increased.
2) The conditions of use
LED constant current driver, there are some LED drivers of the LED using voltage attenuation over. Drive current is greater than the rated drive conditions. In fact, lead to bad light LED products for many reasons, the most important thing is the hot issue, although many manufacturers in the sub-products do not particularly pay attention to heat issues, but these secondary long-term use LED products, the lumen of a focus than the heat LED products to be high. The thermal resistance of LED chip itself, the impact of silver plastic, the cooling effect of the substrate and colloidal and gold also have a relationship with the bad light.