How to detect the quality of LED light emitting diode?
Publish Time: 2024-12-10
In the field of modern science and technology, LED light emitting diode is widely used, and its quality is directly related to the performance and life of many products. Therefore, it is of great significance to accurately detect LED light emitting diode.
Optical performance detection is one of the key links. The determination of luminous intensity is indispensable, and it is usually completed with the help of a professional device called an integrating sphere. The integrating sphere can evenly collect the light emitted by the LED, and accurately measure its luminous flux through a sensor to obtain the luminous intensity value. For example, in the production of lighting fixtures, only by ensuring that the LED luminous intensity meets the design requirements can the lamps meet the expected brightness standards. Wavelength detection is also important. Different wavelengths correspond to different light colors. For white light LEDs, it is necessary to accurately detect whether their color temperature is within the specified range. For example, in indoor lighting scenes, the right color temperature can create a comfortable lighting atmosphere. If the color temperature deviation is too large, it will seriously affect the lighting effect and visual experience. The color rendering index is also an important indicator for measuring optical quality. It reflects the ability of LED to restore the true color of an object. By comparing with standard light sources, LEDs with high color rendering index can make objects more vivid and realistic, which is particularly critical in areas such as commercial display lighting.
Electrical performance testing should not be underestimated. Forward voltage is one of the important parameters. Too high forward voltage may cause the LED to malfunction or even damage it. Using professional voltage measuring instruments, the forward voltage value of the LED can be accurately obtained and strictly compared with the product specifications. The detection of reverse current is also crucial. Excessive reverse current indicates that the LED has quality problems such as leakage, which will greatly affect its stability and life. With the help of precise current measuring equipment, products with excessive reverse current can be discovered and screened out in time.
In addition, reliability testing is also required. The high-temperature aging test places the LED in an environment of 85℃ or even higher temperature for hundreds of hours to observe the changes in its luminous performance and electrical performance under high temperature conditions, so as to evaluate its heat resistance stability. The low-temperature aging test conducts similar tests in a low-temperature environment of about -40℃ to examine its cold resistance. The temperature and humidity cycle test simulates the actual use environment with different temperature and humidity changes, because the fluctuation of temperature and humidity may cause the LED packaging material to expand or contract, thus affecting its performance and reliability. The mechanical impact test verifies the ability of LED to withstand mechanical stress during transportation, installation and use by applying a certain external force impact to ensure that it is not easily damaged.
In summary, through comprehensive and detailed testing of the optical performance, electrical performance and reliability of LED light emitting diodes, high-quality products can be effectively screened out, laying a solid foundation for its reliable application in many fields such as lighting and display, and promoting the high-quality development of related industries.
