LED constant temperature and humidity test requirements

This article combines the latest standards of LED testing methods at home and abroad, based on the actual needs of LED applications in various fields, from the electrical characteristics, optical characteristics, switching characteristics, color characteristics, thermal characteristics, reliability and other aspects were introduced.
Constantly sum up the test schemes of various industries and provide reliability test equipment for the development of domestic enterprises. This paper summarizes and summarizes LED reliability test plans to meet the test requirements of LED companies. In addition, Dongguan Aisihao testing equipment has long been an LED photoelectric enterprise, providing high-low temperature test chambers, constant temperature and humidity test chambers, cold and heat shock test chambers, vibration test benches and other environmental test equipment, and providing high-performance test programs for LED companies.
For the electrical characteristics test, the standard specifies the LED forward voltage, reverse voltage, reverse current test block diagram; for the luminous flux test, the standard specifies the use of 2Ï€ solid angle test structure; for the light intensity test, the standard cites the CIE-127 Recommended conditions; In addition, the spectrum test, thermal characteristics test, electrostatic discharge sensitivity test, life test, etc. are all clearly defined.
The formulation of national standards summarizes the existing LED testing methods, and upgrades the scientifically applicable methods to standard test methods, which eliminates the differences in the field of LED testing and makes the test results reflect China's LED more truly. The overall level of the industry. However, given that LED technology is still in continuous development, the formulation of national standards is not a one-time solution, and the latest and most appropriate test technology should be introduced into the standard at all times.
Environmental Reliability Tests for LED Optoelectronic Products LED reliability includes electrostatic sensitivity characteristics, lifetime, and environmental characteristics. The electrostatic sensitivity characteristic refers to the electrostatic discharge voltage that the LED can withstand. Some LEDs have a high resistivity and a short distance between positive and negative electrodes. When the electrostatic charge at both ends accumulates to a certain value, this electrostatic voltage will break down the PN junction. In severe cases, the PN junction can be broken down and cause the LED to fail. Therefore, the electrostatic sensitivity characteristic of the LED must be tested to obtain the critical voltage of the electrostatic discharge fault of the LED. At present, the human body mode, the machine mode, and the device charging mode are generally used to simulate the electrostatic discharge phenomenon in real life.
For the test of LED environmental characteristics, various types of natural invasion methods that are encountered in the application of the simulated LED are often used, and generally high-low temperature impact test, humidity cycle test, humidity test, salt spray test, sand dust test, irradiation test, vibration And impact test, drop test, centrifugal acceleration test and so on.
In order to observe the changing rules of the light performance when the LED is used continuously for a long time, it is necessary to conduct a sampling test on the LED, and the lifetime parameters of the LED are obtained through long-term observation and statistics.
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