2009/10/13 by Boqian Yang, Yang, Boqian, James Schneeloch +7
Engineering · Materials Science · #Chalcogenide Semiconductor Thin Films #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Other Condensed Matter (cond-mat.other) #Quantum Dots Synthesis And Properties
paper · pdf · doi:10.48550/arxiv.0910.2481
openalex publication_date 2009/10/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Using time-resolved photoluminescence spectroscopy, we studied the electronic levels of semiconductor nanocrystals (NCs) with small spin-orbit coupling such as CdS. Low temperature radiative rates indicate that the lowest energy transition changes from orbital allowed to orbital forbidden with decreasing NC size. Our results are well explained by a size-dependent hierarchy of s- and p-orbital hole levels that is in agreement with theoretical predictions. Around the critical NC radius of ~2 nm, we observe an anti-crossing of s- and p-orbital hole levels and large changes in transition rates.