I. Introduction Semiconductor light-emitting diodes ( LEDs ) have been widely used in indicators, signal lights, instrument displays, mobile phone backlights, vehicle light sources, etc., especially the development of white LED technology , LED applications in the field of lighting is also more and more extensive. However, in the past, there was no comprehensive national standard and industry standard for LED testing. In production practice, it can only be based on relative parameters. Different manufacturers, users and research institutions have been controversial, which has led to serious development of the domestic LED industry. influences. Therefore, the national standard for semiconductor light-emitting diode test methods came into being. Second, LED test methods and content Based on the actual needs of LED applications, LED testing needs to include a variety of aspects, including: electrical characteristics, optical characteristics, switching characteristics, color characteristics, thermal characteristics, reliability and so on. Third, the formulation of national standards Summarizing the above test methods, the national standard for semiconductor light-emitting diode test methods has specified the LED electrical, optical, thermal, electrostatic and life tests. Click on the full link to download
For the electrical characteristic test, the standard specifies the test block diagram of the LED forward voltage, reverse voltage, and reverse current; for the luminous flux test, the standard specifies the 2Ï€ solid angle test structure; for the light intensity test, the standard cites the CIE-127 Recommended conditions; in addition, the spectral test, thermal characteristics test, electrostatic discharge sensitivity test, life test, etc. are clearly defined.
Fourth, the conclusion
The formulation of national standards summarizes the test methods of existing LEDs , and upgrades the scientifically applicable methods to standard test methods, which completely eliminates the differences in the field of LED testing, and also makes the test results more realistically reflect China's LEDs. The overall level of the industry. However, in view of the continuous development of LED technology, the formulation of national standards is not once and for all, and the latest and most appropriate testing techniques should always be introduced into the standards.