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Articles you may be interested inSize dependent optical properties of Si quantum dots in Si-rich nitride/Si3N4 superlattice synthesized by magnetron sputtering Influence of average size and interface passivation on the spectral emission of Si nanocrystals embedded in SiO 2The optical properties of single-crystalline ␣-Si 3 N 4 nanobelts synthesized via catalyst-assisted pyrolysis of polymeric precursor were characterized by absorption, photoluminescence ͑PL͒ and photoluminescence excitation ͑PLE͒. The optical absorption spectrum showed that the nanobelts exhibited indirect absorption behavior with optical band gap of ϳ5.0 eV. Three broad peaks centered at 1.8, 2.3, and 3.0 eV were observed from the room-temperature PL spectrum of the nanobelts. The PLE spectra suggested the existence of multifold energy levels within the gap. A qualitative model was proposed to explain the observed absorption, PL and PLE spectra.

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