In
search of heavy metal-free mid-IR active colloidal materials,
self-doped silver selenide colloidal quantum dots (CQDs) can be an
alternative offering tunable mid-IR wavelength with a narrow bandwidth.
One of the challenges in the study of the intraband transition is
developing a method to widen the intraband transition energy range
as well as reducing the toxicity of the materials. Here, we present
Ag
x
Se (x > 2) CQDs
exhibiting
an intraband transition up to 0.39 eV, produced by the cation exchange
(CE) method from PbSe CQDs. The major electronic transition efficiently
changes from the SWIR band gap of PbSe CQDs to the mid-IR intraband
transition of the Ag
x
Se CQDs by the CE.
The intraband exciton is verified by examining the absorption and
emission of the CE Ag
x
Se CQDs as well
as their applications on electrochemical mid-IR luminescence and mid-IR
intraband photodetectors.
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