Electronic excitations and longitudinal optical phonon modes of self-assembled CdSe quantum dots revealed by microprobe studies

The electronic states of self-assembled CdSe quantum dots and the longitudi nal optical phonon mediated energy relaxation among these states are invest igated. Measurements with microprobe resolution demonstrate that each quant um dot develops specific phonon modes. There is no evidence for a well-defi ned phonon bottleneck in the intra-quantum-dot relaxation. We observe singl e quantum-dot bi-exciton emission and bi-exciton binding energies exceeding 20 meV. (C) 1999 American Institute of Physics. [S0003-6951(99)02917-4].