CdSe nanoparticles synthesized by laser ablation

Nanoparticles of the II$\hbox{--}$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).