研究目的
To explore the nature of reaction products, clusters, and/or small-size QDs in colloidal binary semiconductor quantum dots (QDs) using optical absorption, photoluminescence (PL), and photoluminescence excitation (PLE) spectroscopy.
研究成果
The study demonstrates that it is probable for a range of clusters (with slightly different band-edge energies) to be simultaneously present in a single CdSe sample ensemble, complicating the size determination for small-size CdSe QDs. The findings suggest the need for synthetic methods that minimize the presence of clusters in small-size QD products to enhance QD production yield.
研究不足
The study does not address the challenging issue of characterizing the size and size distribution of one ensemble of clusters or QDs. The presence of clusters complicates the size assignment for small-size CdSe QDs.
1：Experimental Design and Method Selection:
The study involved two non-hot-injection reactions of cadmium oleate (Cd(OA)2) and selenium (Se) in 1-octadecene (ODE), with and without diphenyl phosphine (HPPh2). Optical absorption, PL, and PLE spectroscopy were used to characterize the products.
2：2). Optical absorption, PL, and PLE spectroscopy were used to characterize the products.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Samples were sequentially extracted from reaction batches at different temperatures and times. Optical properties were measured after dispersing aliquots in toluene.
3：List of Experimental Equipment and Materials:
Cadmium oleate (Cd(OA)2), selenium (Se), 1-octadecene (ODE), diphenyl phosphine (HPPh2), toluene (Tol).
4：Experimental Procedures and Operational Workflow:
Reactions were carried out at varying temperatures, with samples taken at specific intervals. Optical measurements were performed on dispersed samples.
5：Data Analysis Methods:
Absorption, PL, and PLE spectra were analyzed to identify clusters and QDs. Deconvolution of spectra was performed to identify different clusters.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
