Abstract

Recently, the achievement of high quantum efficiency light emission from semiconductor nanocrystals using transition metal doping was reported¹ in the ZnS:Mn system. While this system is of considerable interest both scientifically (physics of low dimensional structures) and technologically (fast, high speed phosphors), the excitation dynamics in doped nanocrystals are still not well understood. In order to probe such a system on the picosecond or sub-picosecond time scale, a tunable ultrafast UV source is required. We have developed such a source by using the frequency-doubled output of a 250kHz Ti:sapphire regenerative amplifier² to produce the blue continuum.

© 1994 Optical Society of America