What is the reason for the blackening of the LED light source? Is the LED light source easy to use? With the development of LEDs, the use of LEDs is also increasing. There will be many problems in the process of use. Let me tell you this knowledge.
Is the LED light source easy to use?
The lighting source has gone through three important stages in the past, incandescent lamp-fluorescent lamp-high intensity discharge lamp (HID), this process has gone through more than one hundred years. Nowadays, the LED light source has become a light source with broad development prospects in the lighting industry, and is called the fourth-generation light source.
As an emerging light source, led has long life, high luminous efficiency, low power consumption, short startup time, high color rendering index, low working temperature, firm structure, no fear of vibration, good directionality, low working voltage, and no ultraviolet radiation. It is a new generation light source with the most development potential in the world with its remarkable characteristics such as light weight.
Led light source can realize mercury-free production, which is also of great significance to environmental protection. Solid-state lighting lamps using semiconductor LEDs as light sources will gradually replace traditional lighting lamps and enter various application fields. At present, lighting consumption accounts for about 20% of the entire power consumption, and greatly reducing lighting power consumption is an important way to save energy. LED is attracting the world's attention with its inherent superiority.
The United States, Japan and other countries and Taiwan have predicted the benefits of LED lighting. 55% of the incandescent and fluorescent lamps in the United States are replaced by LEDs, which can save 35 billion US dollars in electricity bills and 755 million tons of carbon dioxide emissions each year. Replacing 100% of Japanese incandescent lamps with LEDs can reduce the power generation of 1-2 nuclear power plants and save more than 1 billion liters of crude oil consumption each year. In Taiwan, 25% of incandescent lamps and 100% of fluorescent lamps are replaced by LEDs, which can save 11 billion kilowatt-hours of electricity each year. LED lighting will also form a huge industrial market of 50 billion US dollars.
What is the reason for the blackening of the LED light source?
The blackening of LED light source is a problem frequently encountered by major LED lighting companies. Due to the lack of professional testing equipment and personnel, most LED lighting companies usually rely on experience and guesswork when doing blackening failure analysis, and lack scientific testing data. However, the blackening of the light source is only the appearance, and causes such as vulcanization, chlorination, bromination, oxidation, carbonization, and chemical incompatibility can all cause the blackening of the LED light source.
1, vulcanization, chlorination, bromination
The silver-plated layer on the LED bracket will generate silver sulfide when it comes into contact with sulfur-containing gas, and it will generate light-sensitive silver halide when it comes into contact with acidic nitrogen-containing chlorine and bromine gas, which will cause the light source to become black 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 should choose a specific sulfur removal plan based on the link where sulfur/chlorine/bromination occurs.
2, oxidation
Silver easily reacts with oxygen in a high temperature and high humidity environment to produce black silver oxide. In view of this situation, further inspections of the air tightness of the light source and lamps should be done to eliminate the path of moisture penetration.
3, carbonization
Based on experience, the material defects of the six raw materials (chips, brackets, die-bonding glue, bonding wires, phosphors, packaging glue) of the LED light source and the process defects of the three major packaging processes (die-fixing, wire bonding, and potting) It may cause the light source to generate extremely high temperature, causing the light source to be partially or overall blackened, and the light source is carbonized. Unreasonable heat dissipation design of LED lamps, low thermal conductivity of heat dissipation materials, unreasonable power supply design, and too many reflow defects can also cause carbonization of the light source. In this case, the light source/lamp should be dissected to find out the source of defects or high thermal resistance.
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 flow. This kind of black LED light source caused by chemical compatibility issues should be investigated for chemical incompatibility of the materials used in the lamps to find out the materials that are incompatible with the light source.
The above 4 reasons for the blackening of the LED light source are a great boon to the professional and technical personnel of the lighting company, which can help them to accurately determine the reason for the blackening of the LED light source, and provide customers with solutions based on the specific reasons for the blackening of the LED light source Plan to find out where the problem lies.
