Temperature monitoring with a high spatial and temporal resolution is vital in various disciplines, including industrial manufacturing, environmental protection, and healthcare monitoring.
Because of their benefits of remote detection, minimum intrusion, tolerance to electromagnetic interference, and high resolution, optical-based sensors offer attractive alternatives for temperature monitoring in biological diagnostics.
The luminous intensity, wavelength, peak width, and (or) decay lifetime – all affect these optical sensing modalities. The upconversion mechanism reduces biological autofluorescence, improves tissue penetration, and produces easily observable and capturable visible light signals, making it a more acceptable tool for biological sensing.
Researchers have created a linear response, fast dynamics, and low excitation power optoelectronic NIR-to-visible upconversion device based on tailored semiconductor heterostructures. The researchers explored the optoelectronic upconversion device’s temperature-dependent photoluminescence properties and verified its capabilities for thermal sensing.
The researchers used a fully integrated optoelectronic upconversion device comprising a low-bandgap gallium arsenide (GaAs) based double junction photodiode and a large-bandgap indium gallium phosphide (InGaP) based light-emitting diode (LED) coupled in series in the new temperature monitoring technique.
The new technique can obtain the spatial distribution and real-time changes in temperature. The upconversion device can be released from the grown substrate and integrated with fiber optics to form light-guided thermal sensors.