Laser ablation synthesis of hydrogenated silicon nanoparticles with green photoluminescence in the gas phase

We found a route for synthesizing hydrogenated Si nanoparticles with 550 nm photoluminescence. The hydrogenated Si nanoparticles were synthesized by laser ablation of Si targets in 14, gas diluted with 5 Torr Ne gas. The photoluminescence, which was measured at 90 ms after laser ablation, is most enhanced in He gas at a partial pressure of I Torr under pulsed-laser excitation at 355 nm. The enhanced photoluminescence is ascribed to hydrogenated Si nanoparticles. The time-resolved photoluminescence spectroscopy revealed that the hydrogenated Si nanoparticles are stable against photoexcitation,while photodesorption of Si, from Si nanoparticles was observed in Ne gas without 114 gas.