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Annealing‐induced bimodal size distribution of small Cd S e quantum dots with white‐light emission
Author(s) -
Hu Lian,
Wu Huizhen
Publication year - 2013
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201228872
Subject(s) - quantum dot , annealing (glass) , materials science , luminescence , photoluminescence , nanotechnology , chemical engineering , optoelectronics , composite material , engineering
White‐light emitting (WLE) CdSe quantum dots (QDs) capped with oleic acid (OA) were synthesized and the effects of thermal annealing and photoactivation on the small CdSe QDs in (polymethyl methacrylate) (PMMA) were investigated. A bimodal size‐distribution phenomenon induced by annealing at temperatures of ∼200 °C was observed. The phenomenon observed here is different from the result of large CdSe QDs with the similar treatment. The size‐dependent property arises from the fact that smaller QDs have a higher surface energy than larger ones. Annealing‐induced bimodal size distribution results in a luminescence change of small CdSe QDs.