1. Oxidation: In the environment of high temperature and high humidity, silver will easily react with oxygen to form black silver oxide. After Duoen Lighting has confirmed that the reason for the blackening of the light source is the oxidation of the silver-plated layer, it will advise the customer to further check the air tightness of the light source and lamps to eliminate the way of moisture penetration.
2. Carbonization: Based on experience, the material shortcomings of the six major raw materials of LED light source (chip, bracket, die-bonding glue, bonding wire, phosphor powder, encapsulation glue) and the three major packaging processes (die-bonding, wire bonding, The shortcomings of the process of glue filling) may cause the light source to generate extremely high temperatures, resulting in partial or complete blackening of the light source and carbonization of the light source. Unreasonable heat dissipation planning of LED lamps, low thermal conductivity of heat dissipation materials, unreasonable power supply planning, and too many defects in reflow soldering will also cause carbonization of the light source.
3. Sulfurization, chlorination and bromination: the silver-plated layer on the LED bracket will generate silver sulfide when it touches sulfur-containing gas, and silver halide that is sensitive to light will be generated when it touches acid nitrogen-containing chlorine and bromine gas, which will cause the light source to emit light. Black fails. Light source sulfur/chlorine/bromination may occur in every link of production, storage, aging, and use of LED strip light sources and lamps. After the blackening of the light source is diagnosed as sulfur/chlorine/bromination, the customer should select a detailed sulfur removal plan according to the occurrence of sulfur/chlorine/bromination.
Fourth, chemical incompatibility: The blackening of LED light sources may also be caused by chemical pollution. This blackening phenomenon often occurs in sealed lamps with little or no air activity. However, the blackening of the light source is only an appearance. The reasons such as vulcanization, chlorination, bromination, oxidation, carbonization and chemical incompatibility will cause the blackening of the LED light source. Due to the lack of professional testing equipment and personnel, most LED companies usually rely on experience and conjecture to analyze blackening failures, and lack scientific testing data.
Benwei Lighting is an LED Tube, LED flood light, LED Panel Light, LED High Bay, LED manufacturer with 12 years of experience. If you want to purchase a high-quality LED flood light or have a more in-depth understanding of the application of LED flood lights, please contact send us inquiry， our web: https://www.benweilight.com/.
