Synthesis of Type I PbSe/CdSe Dot-on-Plate Heterostructures with Near-Infrared Emission
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Updated: Jan 27, 2026
Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
Published on: December 18, 2015
Kali R Williams1, Benjamin T Diroll2, Nicolas E Watkins1
1Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States.
Abstract:
Zero-dimensional PbSe quantum dots are heterogeneously nucleated and grown onto two-dimensional zincblende CdSe nanoplatelets. Electron microscopy shows ad-grown dots predominantly decorate edges and corners of the nanoplatelets. Spectroscopic characterizations relate type I electronic alignment as demonstrated via photoluminescence excitation spectroscopy enhancement of near-infrared emission. Transient photoluminescence and absorption convey ultrafast transfer of excitons to the lower energy semiconductor dots. These structures combine benefits of large absorption cross sections of nanoplatelets and efficient near-infrared emission of PbSe with quantum confinement tuning of energy gap.
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