Green light emitting diodes on a-plane GaN bulk substrates

Edward Alfred Preble; Theeradetch Detchprohm; Mingwei Zhu; Yufeng Li; Yong Xia; Christian Wetzel; Edward Alfred Preble; Lianghong Liu; Tanya Paskova; Drew Hanser

Green light emitting diodes on a-plane GaN bulk substrates

Detchprohm, T., Zhu, M., Li, Y., Xia, Y., Wetzel, C., Preble, E. A., Liu, L., Paskova, T., & Hanser, D. (2008). Green light emitting diodes on a-plane GaN bulk substrates. Applied Physics Letters, 92(24), Article 241109. https://doi.org/10.1063/1.2945664

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Abstract

We report the development of 520-540 nm green light emitting diodes (LEDs) grown along the nonpolar a axis of GaN. GaInN/GaN-based quantum well structures were grown in homoepitaxy on both, a-plane bulk GaN and a-plane GaN on r-plane sapphire. LEDs on GaN show higher, virtually dislocation-free crystalline quality and three times higher light output power when compared to those on r-plane sapphire. Both structures show a much smaller wavelength blue shift for increasing current density (<10 nm for 0.1 to 12.7 A/cm(2)) than conventional LEDs grown along the polar c axis.