Four major factors that cause the LED light source to turn black

1. Vulcanization, chlorination, bromination
The silver-plated layer on the LED bracket will generate silver sulfide when it touches sulfur-containing gas, while touching acidic nitrogen-containing chlorine and bromine gas will generate light-sensitive silver halide, which will cause the light source to blacken and fail. Light source sulfur/chlorine/bromination may occur in every link of the production, storage, aging, and use of LED light sources and lamps. After the darkening of the light source is diagnosed as sulfur/chlorine/bromination, the customer must select a detailed sulfur discharge plan based on the stage of sulfur/chlorine/bromination. At present, Xinqin Lighting has launched sulfur/chlorine/bromine detection items: lamp sulfur/chlorine/bromine (including built-in power supply), lamp sulfur/chlorine/bromine (except for power supply), power supply sulfur/chlorine/bromine, Exhaust sulfur/chlorine/bromine for auxiliary materials, sulfur/chlorine/bromine in packaging workshop, sulfur/chlorine/bromine in lighting workshop, sulfur/chlorine/bromine in reflow soldering workshop. Because the sulfur/chlorine/bromine-containing gas will penetrate into the light source through the silica gel or the gap of the bracket, Xinqin Lighting has also launched an air tightness inspection program to further assist customers in improving the light source requirements.

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2. Oxidation
In the environment of high temperature and high humidity, silver will easily react with oxygen and produce black silver oxide. After Xinqin Lighting confirms that the blackening of the light source is caused by the oxidation of the silver-plated layer, it will advise customers to further check the air tightness of the light source and lamps to eliminate the path of moisture penetration.
3. Carbonization
In terms of experience, the material shortcomings of the six raw materials (chips, brackets, die-bonding glue, bonding wires, phosphors, packaging glue) of the LED light bar light source and the three major packaging processes (die-fixing, wire bonding, glue filling) Disadvantages of the process may cause the light source to generate extremely high temperatures, resulting in part or all of the light source being black, and the light source being carbonized. 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. Therefore, when Xinqin Lighting starts to determine that the cause of the blackening of the light source is carbonization, it will advise customers to follow the path of the failure analysis of the LED light source or lamp, and analyze the light source/lamp to find out the defect or the source of high thermal resistance.

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4. Chemical incompatibility
The blackening of the LED light source may also be caused by chemical pollution. This blackening phenomenon often occurs in sealed lamps with little or no air activity. When Xinqin Lighting determines that the blackening of the light source is caused by a chemical compatibility problem, it will advise customers to check the chemical incompatibility of the materials used in the lamps to find out the materials that are incompatible with the light source. Frequently encountered problems. However, the blackening of the light source is only a manifestation. Reasons such as vulcanization, chlorination, bromination, oxidation, carbonization and chemical incompatibility will cause the blackening of the LED light source. Because of the lack of professional testing equipment and personnel, most LED companies usually rely on experience and conjecture when performing blackening failure analysis, and lack scientific testing data. In response to this phenomenon, Xinqin Lighting launched the blackening of the LED light source to start the diagnosis, aiming to help customers quickly, low-cost and accurately determine the cause of the blackening of the LED light source (in the end is sulfurization, chlorination , Bromination, oxidation, carbonization, or chemical incompatibility?) At the same time, we will provide customers with a further solution plan based on the blackening failure analysis of the LED light source to find the problem.

Post time: Aug-28-2020
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