Origin of the Enhanced Photoluminescence from Semiconductor CdSeS Nanocrystals

• DOI: 10.1021/jz100698m
• Publication Date: 2010-06-30T15:34:04Z
• Authors: D. D. Sarma; Angshuman Nag; Pralay K. Santra; Akshay Kumar; Sameer Sapra; Priya Mahadevan
• Keywords: Lattice (music)

Internal structures of extraordinarily luminescent semiconductor nanoparticles are probed with photoelectron spectroscopy, establishing a gradient alloy structure as an essential ingredient for the observed phenomenon. Comparative photoluminescence lifetime measurements provide direct evidence minimization nonradiative decay channels because removal interfacial defects due to progressive change in lattice parameters such graded structures, exhibiting nearly single-exponential decay. Quantum mechanical calculations suggest differential extent spatial collapse electron and hole wave functions way that helps enhance efficiency, while at same time increasing excited state, experiments.