PHOTOPHYSICS OF ULTRAFINE CDS AND ZNS IN AOT-HEPTANE-WATER MICROEMULSION

Ultrafine CdS and ZnS in AOT-heptane-water microemulsion can be easily synthesised in situ by using an ultrasonic processor as homogeniser. The clusters exhibit 'the quantum size effect'. The average diameter o f particles, as manifested ill tile photoabsorption thresholds of coll oidal semiconductors, increases as the water content of reverse micell es and the concentration of Q-state particles increases. The emission behaviour of CdS shows a corresponding red-shift with increasing parti cle size and it can be effectively quenched by injecting electron/hole scavengers in the inner water pool.