Persistent spectral hole burning in semiconductor nanocrystals

Luminescence Hole Burning and Quantum Size Effect of Charged Excitons in CuCl Quantum Dots

“…It is quenched after the thermal annealing cycle. The phenomena are similar to thermally annealing hole filling [3][4][5][6], and the thermal quenching of the luminescence elongation caused by the light exposure [6].…”

“…However, the effect for bound exciton complexes in semiconductor QDs have not been investigated so far. It was pointed out that exciton complexes in semiconductor QDs play an important role in interesting and applicable phenomena, such as persistent spectral hole burning (PSHB) [3][4][5][6]. Therefore, the study of exciton complexes in semiconductor QDs is valuable to clarify their quantum size effect and the mechanism of the PSHB.…”

Exciton-phonon coupled states in CuCl quantum cubes

“…The persistent spectral hole burning ͑PSHB͒ phenomenon is observed in many materials containing QD's, and PSHB provides a sensitive spectroscopic technique for the study of the size-dependent electronic states and vibrational modes in QD's. [3][4][5][6][7][8][9][10] Since QD's containing only a few hundreds of atoms are like large molecules, the exciton formation in QD's would be expected to strongly influence the lattice vibrations. Recently, the LO phonon sidebands observed in the PSHB and photoluminescence spectra of spherical CuCl nanocrystals in glass showed an energy reduction of about 2 meV, compared with the energy of the LO phonon ͑25.6 meV͒ in the bulk crystals.…”

Exciton-phonon interaction in semiconductor nanocrystals

“…Some I-VII semiconductors that have been used as QD materials, possess the same crystal and (bulk) band structure as lead chalcogenides [73] but the exciton Bohr radius is so small (e.g. a ex ¼ 0.7 nm for CuCl [48]) that the strong confinement regime cannot be realised for such dots.…”

“…The determination of the homogeneous broadening is possible by measuring PL spectra under size-selective excitation [45,46] or by studying the spectral hole burning effect [36,47,48]. Alternatively, it can be deduced from the dephasing time extracted from the exponential decay of the polarisation in four-wave mixing [36,49,50] or photon echo [51] experiments.…”