Colloidal Quantum-Dot Upconverters Out-Performance Existing Reports ACS_AMI quantumdots QD
By Hussain AhmedSep 29 2022Reviewed by Megan Craig, M.Sc. In recent years, the conversion of low-energy infrared photons to higher-energy visible light photons via infrared-to-visible upconverters has attracted a great deal of scientific interest. However, conventional upconverters have restricted detection wavelengths, high baseline infrared energy, and poor photon-to-photon effectiveness.
An upconverter avoids the need for complex processing stages like pixelation, indium bump development, and flip-bonding, hence providing a possible path for realizing high-resolution, low-cost infrared images. Many infrared-to-visible upconverters are built using inorganic or organic infrared-emitting substances, which results in several challenges, including lattice incompatibility concerns, expensive production techniques, and poor optical absorbance. Consequently, the first obstacle is the selection of substances having tuneable band gaps over a broad range of wavelengths. Nanomaterials such as colloidal quantum dots may be highly useful in this respect.
Colloidal quantum dots appear to be viable replacements for traditional organic/inorganic substances in upconversion applications. Colloidal quantum dots with size-tunable band gaps have been employed extensively in the photodetection and light emission sectors, the two primary photonic transition mechanisms of infrared-to-visible upconverters.
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