Despite broad applications
in imaging, energy conversion, and telecommunications,
few nanoscale moieties emit light efficiently in the shortwave infrared
(SWIR, 1000–2000 nm or 1.24–0.62 eV). We report quantum-confined
mercury chalcogenide (HgX, where X = Se or Te) nanoplatelets (NPLs)
can be induced to emit bright (QY > 30%) and tunable (900–1500+
nm) infrared emission from attached quantum dot (QD) “defect”
states. We demonstrate near unity energy transfer from NPL to these
QDs, which completely quench NPL emission and emit with a high QY
through the SWIR. This QD defect emission is kinetically tunable,
enabling controlled midgap emission from NPLs. Spectrally resolved
photoluminescence demonstrates energy-dependent lifetimes, with radiative
rates 10–20 times faster than those of their PbX analogues
in the same spectral window. Coupled with their high quantum yield,
midgap emission HgX dots on HgX NPLs provide a potential platform
for novel optoelectronics in the SWIR.
Photoelectron–photofragment coincidence spectroscopy is used to investigate the dissociative photodetachment of the oxalate monoanion, which results in HOCO + CO2.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.