PICOSECOND DYNAMICS AND STIMULATED EMISSIONS OF EXCITONS IN ZN1-XCDXSE ZNSE QUANTUM-WELLS/

The dynamics and stimulated emission processes of the exciton luminesc ence are studied in quantum wells (QWs) of the Zn1-xCdxSe/ZnSe system. A multiquantum well (MQW) structure shows an exciton lifetime of 150- 280 ps and a stimulated emission effect due to exciton-exciton scatter ing as well as due to electron-hole plasma recombination. A combined-Q W structure in which a single quantum well (SQW) is located adjacent t o MQWs shows a tunneling process of the excitons from the MQWs through the barriers to the SQW. The stimulated emission takes place in the S QW due to phase space filling effects of the excitons. These observed stimulated emission processes are highly related to the blue-laser-dio de operation at both low and room temperatures.