In today's society, with the rapid increase in demand for high-power LEDs for LED application products, especially semiconductor lighting products, the quality requirements for LEDs are also getting higher and higher:
1. Luminous flux classification: Luminous flux value is an indicator that LED users are very concerned about. LED application customers must know which range of LED luminous flux they use, so as to ensure the uniformity and consistency of their product brightness.
2. Reverse leakage current test: The reverse leakage current should be lower than the required value under a certain voltage. The LED reverse leakage current is too high due to static electricity, chip quality and other factors during the production process, which will be used for LED applications The product buries a great hidden danger, and it is easy to cause the LED to die after a period of use.
3. Forward voltage test: The range of forward voltage needs to be within the allowable range of the circuit design. Many customers design to drive the LED to light up in the form of voltage. The magnitude of the forward voltage directly affects the change of the overall parameters of the circuit, thus Will bring hidden dangers to product quality. In addition, for some products that require circuit power consumption, it is desirable to ensure that the forward voltage is as low as possible under the same luminous efficiency.
4. Relative color temperature classification: The color temperature of white LEDs is a parameter that is used more in the color industry. This parameter can directly show whether the color of the LED is warm, cold, or white.
5. Chromaticity coordinate x, y bin: For white light or monochromatic light, chromaticity parameters can be used to express which color area the LED is in. Generally, four points x, y are required to determine a chromaticity area. Certain test methods must be used to ensure whether the LED falls within the required four-point x, y chromaticity area.
6. Dominant wavelength binning: For monochromatic LEDs, the dominant wavelength is an important indicator to measure its color parameters, and the dominant wavelength directly reflects the human eye's visual perception of the light of the LED.
7. Color rendering index classification: The color rendering index is directly related to the degree of discoloration of the object irradiated by the light, and this parameter is very important for LED lighting products.
In view of the above points, we can adopt two schemes for effective light separation and color separation. One is to use a professional high-power LED light separation and color separation machine for automatic classification, which is high in efficiency and fast, and can be used to separate each LED. One type of color separation is the quality control and classification of a large number of manual processes from measuring voltage to leakage current to luminous flux to spectroscopy.
