Mechanistic Insights and Controlled Synthesis of Radioluminescent ZnSe Quantum Dots Using a Microfluidic Reactor

Eder Jose Guidelli, Ioannis Lignos, Jason Jungwan Yoo, Marcella Lusardi, Moungi G. Bawendi, Oswaldo Baffa, Klavs F. Jensen

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

We describe the controlled colloidal synthesis and characterization of ZnSe quantum dots using a continuous-flow microfluidic reactor. A systematic investigation of the synthetic route reveals a possible two-stage pathway for ZnSe nanocrystal formation. The first stage corresponds to the formation of zinc selenide nuclei at low temperatures (160 °C), followed by the growth of ZnSe nanocrystals at higher temperatures (340 °C). The quantum dots exhibit sharp exciton absorption, with tunable emission spectra between 370 and 430 nm. The photoluminescence of ZnSe nanocrystals is characterized by narrow emission linewidths of 14-21 nm. For the first time, we report luminescent emission from ZnSe nanocrystals upon X-ray excitation, revealing that radioluminescence emission is associated to confined excitons, and that the radioluminescence intensity is a linear function of the fluence/dose rate of X-rays. The precise control of the synthesis of particles with uniform sizes and excellent optical properties associated with the microfluidic synthesis opens a new avenue for the controlled production of heavy-metal-free luminescent and radioluminescent nanocrystals in flow.

Original languageEnglish (US)
Pages (from-to)8562-8570
Number of pages9
JournalChemistry of Materials
Volume30
Issue number23
DOIs
StatePublished - Dec 11 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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