The Chinese LED industry started in the 1970s. After more than 30 years of development, the Chinese LED industry has initially formed a relatively complete industrial chain including the production of LED epitaxial wafers, the preparation of LED chips, the packaging of LED chips, and the application of finished LED products.
LED lighting LEDs are made of III-IV group compounds, such as GaAs (gallium arsenide), GaP (gallium phosphide), GaAsP (gallium arsenide) and other semiconductors, the core of which is the PN junction. Therefore, it has the IN characteristics of a general PN junction, that is, forward conduction, reverse cutoff, and breakdown characteristics. In addition, under certain conditions, it also has luminescent properties. Under the forward voltage, electrons are injected into the P region from the N region, and holes are injected into the N region from the P region. A part of the minority carriers (minor carriers) that enters the opponent's area recombine with the majority carrier (multiple carriers) and emit light. Assuming that luminescence occurs in the P region, the injected electrons directly recombine with valence band holes to emit light, or they are first captured by the luminescent center and then recombine with holes to emit light. In addition to this luminescent recombination, some electrons are captured by the non-luminescent center (the center is located near the middle of the conduction band and the dielectric band), and then recombined with the hole. The energy released each time is not large and cannot form visible light.
Market requirements for LED lighting products:
Some people call the LED light source a long-life lamp, which means a lamp that never goes out. Solid cold light source, epoxy resin encapsulation, no loose parts in the lamp body, there are no shortcomings such as filament burning, thermal deposition, light decay, etc. The service life can reach 60,000 to 100,000 hours, which is 10 times longer than the traditional light source the above.
Therefore, to achieve such an ideal state, anti-aging ability is particularly important.
1. Aging test of LED lighting products:
The long-term aging test of LED backlight and lighting products is a very important test. Through the aging test, it is possible to find early failures such as light decay, color temperature change, and electrical leakage that may occur during long-term use of LED products, which is conducive to the stability of product performance. ITECH power supply and aging test software are mainly used for aging test of LED backlight and lighting products.
The results of the aging test of LED lighting products have a great relationship with the equipment used. The aging equipment and LED lighting products must ensure that the optimal aging time is determined under the condition of sufficient heat dissipation, and the aging system monitors the data for analysis and comparison. In order to get the most accurate test data, so as to achieve the purpose of production and testing.
Second, the characteristics of the power supply and aging system used in the LED aging test:
Because the working current of LED is very special, it needs a professional test system to get reliable data. In general, the power supply and aging system used in the LED aging test should have the following characteristics:
1) High power ratio digital control DC power supply, with a wide voltage and current usage rate, and a wide range of applications;
2) The rate of change of voltage and current can be automatically controlled to minimize the cost;
3) High precision and high resolution;
4) Low noise and ripple;
5) As small as possible, save space;
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