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Title: Ultrathin highly luminescent two-monolayer colloidal CdSe nanoplatelets
Authors: Delikanli, Savas
Yu, Guannan
Yeltik, Aydan
Bose, Sumanta
Erdem, Talha
Yu, Junhong
Erdem, Onur
Sharma, Manoj
Sharma, Vijay Kumar
Quliyeva, Ulviyya
Shendre, Sushant
Dang, Cuong
Zhang, Dao Hua
Sum, Tze Chien
Fan, Weijun
Demir, Hilmi Volkan
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Delikanli, S., Yu, G., Yeltik, A., Bose, S., Erdem, T., Yu, J., . . . Demir, H. V. (2019). Ultrathin highly luminescent two-monolayer colloidal CdSe nanoplatelets. Advanced Functional Materials, 29(35), 1901028-. doi:10.1002/adfm.201901028
Journal: Advanced Functional Materials 
Abstract: Surface effects in atomically flat colloidal CdSe nanoplatelets (NLPs) are significantly and increasingly important with their thickness being reduced to subnanometer level, generating strong surface related deep trap photoluminescence emission alongside the bandedge emission. Herein, colloidal synthesis of highly luminescent two-monolayer (2ML) CdSe NPLs and a systematic investigation of carrier dynamics in these NPLs exhibiting broad photoluminescence emission covering the visible region with quantum yields reaching 90% in solution and 85% in a polymer matrix is shown. The astonishingly efficient Stokes-shifted broadband photoluminescence (PL) emission with a lifetime of ≈100 ns and the extremely short PL lifetime of around 0.16 ns at the bandedge signify the participation of radiative midgap surface centers in the recombination process associated with the underpassivated Se sites. Also, a proof-of-concept hybrid LED employing 2ML CdSe NPLs is developed as color converters, which exhibits luminous efficacy reaching 300 lm Wopt−1. The intrinsic absorption of the 2ML CdSe NPLs (≈2.15 × 106 cm−1) reported in this study is significantly larger than that of CdSe quantum dots (≈2.8 × 105 cm−1) at their first exciton signifying the presence of giant oscillator strength and hence making them favorable candidates for next-generation light-emitting and light-harvesting applications.
ISSN: 1616-301X
DOI: 10.1002/adfm.201901028
Schools: School of Electrical and Electronic Engineering 
School of Physical and Mathematical Sciences 
Organisations: Centre of Excellence for Semiconductor Lighting and Displays
Centre for Optoelectronics and Biophotonics
Rights: This is the accepted version of the following article: Delikanli, S., Yu, G., Yeltik, A., Bose, S., Erdem, T., Sharma, M., . . ., Demir, H. V. (2019). Ultrathin highly luminescent two-monolayer colloidal CdSe nanoplatelets. Advanced Functional Materials, 29(35), 1901028-., which has been published in final form at doi:10.1002/adfm.201901028. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
SPMS Journal Articles

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