Comparative study of diodes and their optical performance
Subject Areas : journal of Artificial Intelligence in Electrical Engineering
Hassan Absalan
1
(
Department of Physics, Ahar Branch, Islamic Azad University, Ahar, Iran
)
Keywords: optical performance, diode, stimulated and Spontaneous emission, quantum efficiency,
Abstract :
In this paper, the basis of optical performance of diodes have been compared. A laser diode (LD) operates based on stimulated emission and emits coherent light. The performance of the light emitting diode (LED) is also based on spontaneous emission and emits incoherent light with different wavelengths. On the other hand, the optical performance of superluminescent light emitting diode (SLED) is based on amplified spontaneous emission. Experimental results have shown that the LD has a thin optical spectrum, and the LED and SLED have a wide optical spectrum. Also, the output optical power of LED and SLED is medium, and the output power of LD is high. The wavelength of the emitted light of each diode depends on the energy bandgap of the semiconductor material that makes that diode. The highest internal quantum efficiency of LEDs, which is achieved at low current densities, is greater than 80% and for blue light-emitting diodes 450 nm.
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