Optical and microstructural characterization of chemically synthesized gallium nitride nanopowders

Kenneth E. Gonsalves, Sri Prakash Rangarajan, Greg Carlson, Jayant Kumar, Ke Yang, Mohamed Benaissa, M. José-Yacaman

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51 Scopus citations


Thermal decomposition of an amido precursor; [Ga2(NMe2)6, Me = CH3] in an ammonia atmosphere yielded nanostructured gallium nitride powder. The x-ray diffraction spectrum of the nanosized gallium nitride exhibited reflections corresponding to the lattice planes of fcc (zinc blende) GaN. High resolution transmission electron microscopy confirmed the cubic structure of the material and evidence of stacking faults within the fcc structure. Infrared spectra showed the characteristic Ga-N stretch at 550 cm-1. Transmission electron microscope measurements indicated that the GaN consisted of ≈50 nm sized particles which in turn are agglomerates of smaller particles with ≈5 nm domain sizes. The photoluminescence (PL) emission spectrum of the GaN was found to be sensitive to the excitation wavelength exhibiting peaks at 378 and 317 nm. The PL excitation spectrum showed resonances in the 200-300 nm region. These PL results suggest the effect of quantum confinement in these GaN particles.

Original languageEnglish (US)
Pages (from-to)2175-2177
Number of pages3
JournalApplied Physics Letters
Issue number15
StatePublished - Oct 13 1997
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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