Synthesis of Highly Luminescent GaSe Nanoparticles

The synthesis, characterization, and purification of GaSe nanoparticles are described in this paper. TEM images show that this synthesis produces GaSe nanoparticles in the size range of 2−6 nm. These particles may be size segregated by column chromatography or size selective precipitation, and relatively monodisperse nanoparticles are obtained. Electron diffraction results indicate that these particles have a two-dimensional single tetralayer type structure. The particles have absorption onsets in the 360 to 450 nm region, with the smallest particles absorbing furthest to the blue. The particles are emissive, with emission quantum yields of about 10%.