Correlating yellow and blue luminescence with carbon doping in GaN

S. Schmult, H. Schürmann, G. Schmidt, P. Veitb, F. Bertram, J. Christen, A. Großer, T. Mikolajick

Blue and yellow emission bands in carbon-doped GaN grown by MBE were investigated in low-temperature cathodoluminescence measurements performed in a scanning transmission electron microscope (STEM-CL) with high spatial resolution. Blue luminescence at 2.85 eV and two contributions in the spectral range of the yellow emission band around 2.2 eV separated by 120 meV are observed in carbon-doped material, whereas only one distinctive yellow luminescence contribution was found in unintentionally-doped GaN.

Link to the paper: https://www.sciencedirect.com/science/article/pii/S0022024822001221