journal article·2019-10-17Open access

Identifying Clusters and/or Small-Size Quantum Dots in Colloidal CdSe Ensembles with Optical Spectroscopy

Lijia Li, Meng Zhang, Nelson Rowell, Theo Kreouzis, Hongsong Fan, Qiyu Yu, Wen Huang, Xiaoqin Chen, Kui Yu

Abstract

It is well-known that optical absorption and photoluminescence (PL) provide information that is sensitive to the size and size distribution of colloidal binary semiconductor quantum dots (QDs). To explore the nature of reaction products, clusters, and/or small-size QDs, we show that it is important to perform as well photoluminescence excitation (PLE) spectroscopy. For two non-hot-injection reactions of cadmium oleate (Cd(OA) 2 ) and selenium (Se) in 1-octadecene (ODE), we show that sequentially extracted products displayed a similar apparent red shift in both absorption and PL with a full width at half-maximum (fwhm) of ∼30 nm. We demonstrate that one reaction (with the presence of diphenyl phosphine (HPPh 2 )) produced multiple types of clusters (with slightly different optical properties) in one ensemble, while the other reaction (without HPPh 2 ) yielded primarily small-size QDs. Our findings provide evidence for the probable existence of clusters within small-size CdSe QD products, the existence of which complicates the size determination of small-size CdSe QDs.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films · Nanocluster Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Engineering Research Center in Biomaterials, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China

Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China

Metrology Research Centre, National Research Council Canada, Ottawa, Ontario K1A 0R6, Canada

School of Physics and Astronomy, Queen Mary University of London, London E1 4NS, United Kingdom

College of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, China

State Key Laboratory of Polymer Materials Engineering, Chengdu, Sichuan 610065, People’s Republic of China

Laboratory of Ethnopharmacology, West China School of Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610065, People’s Republic of China

Funding

Department of S and T for Social Development · National Natural Science Foundation of China · State Key Laboratory of Supramolecular Structures and Materials of Jilin University · State Key Laboratory of Polymer Materials Engineering of Sichuan University

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