期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 13, 期 8, 页码 1952-1961出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c04076
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类别
资金
- JNCASR
- Sheikh Saqr Laboratory
- Department of Science and Technology, Government of India
- CSIR
- SERB-POWER
This article discusses the research on the optical properties and oxidation state of copper-doped semiconductor nanocrystals, and points out the technical difficulties caused by the lack of spatial separation.
Luminescent Cu-doped semiconductor nanocrystals have played a pivotal role in the emergence of lighting and display applications for a long time. However, consensus regarding the Cu oxidation state and hence their emission mechanism has not been attained. Distinction between seemingly simple optically and magnetically active Cu2+ and inactive Cu1+ has surprisingly been the subject matter of debate in the literature for more than a decade. In this Perspective, we first discuss the fundamental quantum mechanical phenomenon explaining the optical properties of the monovalent and divalent Cu dopants. We then focus down on various techniques used to differentiate between these two fundamental mechanisms, their benefits, and their pitfalls arising in large part because of the lack of spatial separation. Hence, to obtain a cohesive story consistent with all the observations, we discuss recent results from single-molecule spectroscopy to understand the optical properties and hence the oxidation state of internally doped Cu in doped nanocrystals.
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