How to test the electrical and optical characteristics of LED lamp beads
LED light-emitting diodes have been widely used in indicator lights, signal lights, instrument displays, mobile phone backlights, vehicle light sources and other occasions. In the past, there were no comprehensive national and industry standards for the testing of LED lamps. In production practice, only relative parameters could be used as the basis. Different manufacturers, users, and research institutions had great disputes on this, which led to the development of the domestic LED industry. Great influence.
Combined with the latest standards on LED test methods at home and abroad, based on the actual needs of various LED application fields, we know that the performance test of LED lamp beads includes electrical characteristics, optical characteristics, switching characteristics, color characteristics, thermal characteristics, reliability and other aspects. , Today, Xiaobian will first take you to understand the test methods of electrical characteristics and optical characteristics.
1. Electrical characteristic test method
LED is a unipolar PN junction diode composed of semiconductor inorganic materials, and the relationship between its voltage and current is called volt-ampere characteristics. LED electrical characteristic parameters include forward current, forward voltage, reverse current and reverse voltage. LEDs must be driven by appropriate current and voltage to work properly. Through the test of LED electrical characteristics, the maximum allowable forward voltage, forward current and reverse voltage and current of the LED can be obtained, and the optimal working electric power of the LED lamp can also be determined.
The test of the electrical characteristics of the LED is generally carried out with a voltage and ammeter under the power supply of the corresponding constant current and constant voltage source.
2. Optical characteristic test
Similar to other light sources, the test of LED light characteristics mainly includes luminous flux, luminous efficiency, radiant flux, radiation efficiency, light intensity, light intensity distribution characteristics and spectral parameters.
After measuring the luminous flux, the luminous efficiency of the LED can be measured with the electrical parameter tester. The test methods of radiant flux and radiant efficiency are similar to those of luminous flux and luminous efficiency.
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