Room temperature emission from CdSe/ZnSSe/MgS single quantum dots

The authors report on room temperature photoluminescence from single CdSe quantum dots. The quantum dots, realized by self-organized epitaxial growth, are embedded in ZnSSe/MgS barriers. The integrated intensity of the emission drops by less than a factor of 3 between 4 K and room temperature. Microphotoluminescence with a spatial resolution of 200 nm exhibits single dot emission that remains visible up to 300 K. The linewidth of the single dot emission increases thereby from 340 mu eV to 25 meV at room temperature, which the authors attribute to the interaction of excitons with optical phonons. (c) 2007 American Institute of Physics.