In this work, we demonstrate the ability of silver gallium sulfide (AGS) nanocrystals to emit over a wide range of wavelengths from blue-green to orange. Using a high temperature, air-free synthesis, we can controllably grow AGS nanocrystals with varying degrees of crystallinity. By growing the crystals with an intentionally poor crystal structure, internal defects are introduced into the lattice which lead to broad trap-state emission similar in width and wavelength to the characteristic emission observed in copper indium sulfide nanocrystals. By annealing at higher temperatures the expected chalcopyrite structure is improved, and the much shorter wavelength, band-gap emission is observed. Incorporation of zinc into the crystal structure has also been used to further tune the emission through both alloying and shelling. Particles have been characterized by TEM and XRD for shape and structural analysis, optical absorption and emission for band-gap and trap-state behavior, as well as ICP and EDS for compositional analysis.

Tuning the optical properties of AgGaS<sub>2</sub> nanocrystals

253rd National Meeting (2017)

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Tuning the optical properties of AgGaS2 nanocrystals

Tuning the optical properties of AgGaS₂ nanocrystals