Because of its small volume, directional emission light, high brightness and pn junction characteristics, the semiconductor light-emitting diode (LED) produces many new problems in quality evaluation and detection methods.
Optical properties: The optical performance of LED mainly involves the performance requirements of spectrum, luminosity and chroma.
Electrical properties: Led PN junction characteristics, determines the LED in the lighting application of the difference between the traditional light source of electrical properties, namely, unidirectional non-linear conductivity, low voltage drive and the characteristics of electrostatic sensitivity.
Thermal performance: Lighting with LED light-emitting efficiency and power is one of the key issues in the development of the current led industry, at the same time, the LED PN junction temperature and Shell heat dissipation is particularly important, generally with resistance, shell temperature, junction temperature and other parameters expressed.
Radiation safety: At present, IEC will be the equivalent of LED products in semiconductor lasers to the requirements of radiation safety testing and demonstration.
Effective life is the duration of the LED in the rated power condition, the luminous flux attenuation to the specified percentage of the initial value.
