PHOTOELECTRIC PERFORMANCE TEST
Semiconductor light-emitting diode (LED) is often used as an indicator light, signal light, instrument display, mobile phone backlight, vehicle light source, and in other places.
Foreword:
Semiconductor light-emitting diode (LED) is often used as an indicator light, signal light, instrument display, mobile phone backlight, vehicle light source, and in other places. As white LED technology keeps getting better, more and more people are using it to light their homes. Before, there were no national or industry-wide standards for testing LEDs. It can only be based on relative parameters in the production process. Different manufacturers & research institutions have strong disagreements about this, which has hurt the growth of the domestic LED industry in a big way. The author talks about the electrical characteristics, optical characteristics, switching characteristics, thermal characteristics, reliability, and so on. These are based on the actual needs of different LED application fields and the latest standards for testing LEDs at home and abroad.
A way to test electrical traits:
LED is a one-polar PN junction diode made of inorganic semiconductors. The way voltage and current work together is called the volt-ampere characteristic. Forward current, forward voltage, reverse current, and reverse voltage are some of the electrical parameters of an LED. For the LED to work, it needs the right amount of current and voltage (as shown in Figure 1). By testing the electrical properties of an LED, it is possible to find out what its maximum forward voltage, forward current, reverse voltage, and reverse current is. Also, the best amount of power for an LED to work can be measured.
The electric eye door opener, light meters used in photography, solar panels, and photostatic copying are all products of the photoelectric effect. When a material absorbs electromagnetic radiation, electrically charged particles are released from or inside the material. This is called the photoelectric effect. When light hits a metal plate, electrons are pushed out of the plate.
The photoelectric effect is used in:
- A photomultiplier tube uses the photoelectric effect to change the amount of light into electric currents.
- Photocopies, light meters, photodiodes, and phototransistors are all things that use the photoelectric effect.
- Scintillators: A scintillator is a device that gives off light when it picks up radiation from a lab source or space.
