CdSe nanoparticles synthesized by laser ablation

EPL, 84 (2008) 47001

N. G. Semaltianos, S. Logothetidis, W. Perrie, S. Romani, R. J. Potter, M. Sharp,
P. French, G. Dearden and K. G. Watkins

Nanoparticles of the II–VI semiconductor CdSe were synthesized by laser ablation (387 nm, 180 fs, 1 kHz, pulse energy = 4 μJ (fluence =1 J/cm2)) of the target material in methanol. The nanoparticles size distribution follows a log-normal function with statistical median diameter in the range of ≈ 5–6 nm. Their crystalline structure is the same as that of the bulk material and are Se rich (Cd : Se percentage ratio ~ 0.8 : 1). Strong, spectrally “clean” and relatively narrow photoluminescence emission from the produced nanoparticles was detected in the green (~ 552 nm).