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Title: CdSe/CdSe1–xTex core/crown heteronanoplatelets : tuning the excitonic properties without changing the thickness
Authors: Kelestemur, Yusuf
Guzelturk, Burak
Erdem, Onur
Olutas, Murat
Erdem, Talha
Usanmaz, Can Firat
Gungor, Kivanc
Demir, Hilmi Volkan
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2017
Source: Kelestemur, Y., Guzelturk, B., Erdem, O., Olutas, M., Erdem, T., Usanmaz, C. F., . . . Demir, H. V. (2017). CdSe/CdSe1–xTex core/crown heteronanoplatelets : tuning the excitonic properties without changing the thickness. Journal of Physical Chemistry C, 121(8), 4650–4658. doi:10.1021/acs.jpcc.6b11809
Project: NRF-NRFI2016-08
Journal: Journal of Physical Chemistry C
Abstract: Here we designed and synthesized CdSe/CdSe1-xTex core/crown nanoplatelets (NPLs) with controlled crown compositions by using the core-seeded-growth approach. We confirmed the uniform growth of the crown regions with well-defined shape and compositions by employing transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. By precisely tuning the composition of the CdSe1-xTex crown region from pure CdTe (x = 1.00) to almost pure CdSe doped with several Te atoms (x = 0.02), we achieved tunable excitonic properties without changing the thickness of the NPLs and demonstrated the evolution of type-II electronic structure. Upon increasing the Te concentration in the crown region, we obtained continuously tunable photoluminescence peaks within the range of ∼570 nm (for CdSe1-xTex crown with x = 0.02) and ∼660 nm (for CdSe1-xTex crown with x = 1.00). Furthermore, with the formation of the CdSe1-xTex crown region, we observed substantially improved photoluminescence quantum yields (up to ∼95%) owing to the suppression of nonradiative hole trap sites. Also, we found significantly increased fluorescence lifetimes from ∼49 up to ∼326 ns with increasing Te content in the crown, suggesting the transition from quasi-type-II to type-II electronic structure. With their tunable excitonic properties, this novel material presented here will find ubiquitous use in various efficient light-emitting and -harvesting applications.
ISSN: 1932-7447
DOI: 10.1021/acs.jpcc.6b11809
Schools: School of Electrical and Electronic Engineering 
School of Materials Science and Engineering 
School of Physical and Mathematical Sciences 
Organisations: Luminous! Center of Excellence for Semiconductor Lighting and Displays
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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