Power improvement in ridge bent waveguide superluminescent light-emitting diodes based on GaN quantum dots

Abstract

In this paper, the performance of ridge-waveguide superluminescent light-emitting diodes (SLED) based on nitride quantum dots has been reported. For this purpose, the three-dimensional Schrodinger equation has been solved numerically by the finite volume method for truncated pyramidal quantum dots as active regions taking into account all spontaneous and piezoelectric effects. To calculate the modal gain in the active region, the traveling-wave rate equations model has been used. We solved the traveling-wave equations coupled with the carrier density rate equation to obtain the output power related to the bias current, numerically. The output power is one of the parameters that describe the performance of a superluminescent light-emitting diode. The output power is studied for the SLEDs with different waveguide structural parameters such as the cavity length and radius of curvature. The temperature-dependent of the SLED output power is also investigated. The maximum output power of the SLED increased up to 0.08 W for the cavity with the length of 1200 mm.

Role of Pyramidal Low-Dimensional Semiconductors in Advancing the Field of Optoelectronics

“…Moreover, Chua et al prepared a phosphorus-free pyramidal InGaN/GaN QD white-light LED and discovered that the internal quantum efficiency of the QD reached up to 50% at room temperature [290]. In another study, Rokhi et al evaluated a ridge waveguide super-radiance LED based on truncated pyramidal GaN QDs and observed that QDs with an uneven size distribution produced larger spectral widths, thereby leading to higher output powers [291]. They also found that the output power of the ridge waveguide super-radiance LED decreased with an increase in temperature (Figure 27).…”