Search results for "Spinel Si3N4"

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Defects induced by He+ irradiation in γ-Si3N4

2021

International audience; Formation and evolution of defect levels in the electronic structure of silicon nitride with cubic spinel structure, -Si 3 N 4 , after the irradiation with He + ions was investigated using spectroscopic techniques. Strong changes of cathodoluminescence (CL), photoluminescence (PL), photoluminescence excitation (PLE) and Raman spectra were detected. In particular, excitonic PL was significantly inhibited and a new near-IR band appeared with the band gap excitation h≥E g =5.05 eV. This was explained by an effective trapping of photoinduced electrons and holes by charged defects. The spectral shift of PL with the excitation photon energy indicated heterogeneous nature…

Spinel Si3N4PhotoluminescenceMaterials scienceBand gapExcitonCathodoluminescenceBiophysicsCathodoluminescence02 engineering and technologyElectronic structureengineering.material010402 general chemistry01 natural sciencesBiochemistryHe+ irradiation[SPI.MAT]Engineering Sciences [physics]/Materialssymbols.namesakeCondensed Matter::Materials SciencePhotoluminescence excitation[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]PhotoluminescenceStructural defectsComputingMilieux_MISCELLANEOUSSpinelGeneral Chemistry[CHIM.MATE]Chemical Sciences/Material chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsAtomic and Molecular Physics and Optics0104 chemical sciencesCrystallographyengineeringsymbols[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]0210 nano-technologyRaman spectroscopy
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