Mechanisms of Yellow and Red Photoluminescence in Wurtzite and Cubic GaN

M. Godlewski a, T. Suskib, I. Grzegoryb, S. Porowskib, R. Langerc, A. Barskic, J.P. Bergmand, B. Monemard, E.M. Goldyse and M.R. Phillipsf aInstitute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland bHigh Pressure Research Center, Polish Academy of Sciences, Sokołowska 29, 01-142 Warsaw, Poland cCEA-Grenoble, DRFMCSP2M, 17 rue des Martyrs, 38054 Grenoble, France dDept. Phys. & Meas. Technol., Linköping Univ., 581 83 Linköping, Sweden eSemicond. Sci. & Technol. Lab., Macquarie Univ., North Ryde, 2109 NSW, Australia fMicrostructural Analysis Unit, University of Technology, Sydney, Australia

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The origin of two "deep" photoluminescence (PL) emissions observed in wurtzite (yellow PL) and cubic (red PL) GaN is discussed. PL and time-resolved PL studies confirm donor-acceptor pair character of the yellow band in wurtzite GaN and point to participation of shallow donors in this emission. A similar PL mechanism is proposed for the red emission of cubic GaN. We further show a puzzling property of both yellow and red PLs. Both yellow and red emissions show spatial homogeneity and are only weakly dependent on surface morphology.

DOI: 10.12693/APhysPolA.94.326 PACS numbers: 61.16.Ch, 61.72.Ff, 71.55.Eq