address：88 Ling Shan Road, Xukou, Wuzhong District, Suzhou City, Jiangsu Province, Unit 9A, 5th Floor, Liandong U Valley.
Telephone：0512-66559708
If you have any other questions, you can contact us by email
Contact Email
marketing@tronovo.com
LED test methods and requirements
Semiconductor light-emitting diode (led) is a new type of light-emitting body, electro-optical efficiency, small size, long life, low voltage, energy saving and environmental protection, is the next generation of ideal lighting devices. led photoelectricity test is to test the LED photoelectricity performance of the important and the only means of test, the corresponding test results is to evaluate and reflect the current level of development of China's LED industry basis. The development of LED photoelectric test method standard is an important way to unify the measurement of LED product photoelectric performance, is to make the test results truly reflect the level of development of China's LED industry premise. This paper combines the latest national standards for LED test methods, introduces several major aspects of LED photoelectric performance testing.
Electrical propertyLED is a unipolar PN junction diode composed of semiconductor inorganic material, which is one type of semiconductor PN junction diode, and its voltage-current relationship is called volt-ampere characteristic. As can be seen from Figure 1, the LED electrical characteristic parameters include forward current, forward voltage, reverse current and reverse voltage, and the LED must be driven by the appropriate current and voltage to work properly. Through the LED electrical characteristics of the test can obtain the LED's maximum allowable forward voltage, forward current and reverse voltage, current, in addition to determining the LED's optimal operating power. |
Optical propertySimilar to other light sources, LED light characteristics of the test mainly includes luminous flux and luminous efficiency, radiant flux and radiation efficiency, light intensity and light intensity distribution characteristics and spectral parameters, etc.; in the measured luminous flux, with the electrical parameter tester can be measured with the luminous efficiency of the LED. The test method of radiant flux and radiation efficiency is similar to the test of luminous flux and luminous efficiency. |
Switching CharacteristicsLED switching characteristics refers to the LED power on and off instant light, electricity, color change characteristics. Through the LED switching characteristics of the test can be obtained in the LED power on and off instant working state, material properties of the law of change, which can not only understand the power on and off on the loss of LED, can also be used to guide the design of the LED driver module. |
Color Characteristics ONq=bI*The color characteristics of LEDs mainly include color coordinates, main wavelength, color purity, color temperature and color rendering, etc. The color characteristics of LEDs are especially important for white LEDs. Existing color characteristics test methods include spectrophotometry and integration method. As shown in Figure 7: spectrophotometry is measured through the monochromator spectral power distribution of the LED, and then use the chromaticity weighting function to obtain the corresponding chromaticity parameters; integral method is to use specific filters with photodetectors to directly measure the chromaticity parameters; spectrophotometry is much more accurate than the integral method. |
88 Ling Shan Road, Xukou, Wuzhong District, Suzhou City, Jiangsu Province, Unit 9A, 5th Floor, Liandong U Valley.
0512-66559708
WeChat customer
Tmall Official Flagship Store
Copyright © 2003-2024 , All Rights Reserved Aiyong Instruments (Suzhou) Co., Ltd.
