The meaning of LED internal quantum efficiency and its influence on the photoelectric efficiency of different luminous wavelengths

The meaning of LED internal quantum efficiency and its influence on the photoelectric efficiency of different luminous wavelengths
　　One, the meaning of LED internal quantum efficiency

LED (light-emitting diode) is a semiconductor light-emitting device based on semiconductor materials, widely used in lighting, display, decoration and other fields. The internal quantum efficiency of LED refers to the ratio of the number of photons generated inside the LED to the number of injected electrons. It reflects the efficiency of converting electrical energy to light energy inside the LED and is an important indicator for evaluating the luminous performance of LED. The higher the quantum efficiency, the higher the luminous efficiency of LED and the better the luminous quality.

Two, factors affecting the internal quantum efficiency of LED

There are many factors affecting the internal quantum efficiency of LED, mainly including: material type and doping, structural design, process conditions, operating temperature, driving current, etc. The type of material and doping determines the electrical-optical conversion efficiency of LED, structural design and process conditions affect the injection and recombination process of electrical carriers, operating temperature and driving current affect the thermal stress and the life of electrical carriers in LED.

Three, the influence of different luminous wavelength photoelectric efficiency

The luminous wavelength range of LED is extensive, ranging from ultraviolet to infrared, from red to blue, even including green and white. Different luminous wavelengths also have different effects on the internal quantum efficiency of LED. In red and yellow LED, the internal quantum efficiency is mainly affected by the type of material and the doping concentration, while in blue and green LED, the internal quantum efficiency is mainly affected by structural design and process conditions. To improve the internal quantum efficiency of blue and green LED, it is usually necessary to optimize the structural design to reduce the non-radiative recombination of electrical carriers, thereby improving the efficiency of photon generation. At the same time, optimizing the driving current and controlling the operating temperature are also important means to improve the internal quantum efficiency of blue and green LED.

Four, Conclusion

The internal quantum efficiency of LED is an important indicator for evaluating the luminous performance of LED, and its level directly affects the luminous efficiency and quality of the LED. The influence of different luminous wavelengths on the internal quantum efficiency of LED is different, so when designing and manufacturing LED, different optimization strategies need to be adopted for different luminous wavelengths to improve the internal quantum efficiency of LED, thereby improving the luminous efficiency and quality of the LED. With the continuous advancement of LED technology, we believe that the improvement of internal quantum efficiency of LED in the future will bring more innovative and development opportunities to the field of LED lighting and display.