Determining Bandgap of Thermochromic Phosphor Films via Reflectance Measurements under Controlled Heating

Simple item page
dc.contributor.authorKatashaya, Steven Rwabona
dc.date.accessioned2024-10-15T06:39:56Z
dc.date.available2024-10-15T06:39:56Z
dc.date.issued2024
dc.description.abstractIn this article, we present a method to determine the bandgap of a thermochromic phosphor film by simple reflectance measurements under controlled heating. The phosphor is illuminated by a light-emitting diode while being heated continuously. The reflected light is detected using a calibrated photodiode circuit based on an operational transconductance amplifier. We apply the Schuster Kubelka-Munk function to deduce the absorbance over temperature and thus the bandgap. We show, for the first time, that the thermochromic phosphor's color change follows Arrhenius's Law and therefore involves activation energy. We estimate the bandgap to be between 1.1 eV and 1.9 eV and find an activation energy of 46.67 ±1.6 kJ/mol. The simplicity of the approach will appeal to undergraduate teachers and students of physics and materials science. The technique can be used to investigate other thermochromic materials as well.
dc.identifier.citationKatashaya, Steven Rwabona (2024). Determining Bandgap of Thermochromic Phosphor Films via Reflectance Measurements under Controlled Heating. Kabale: Kabale University.
dc.identifier.urihttp://hdl.handle.net/20.500.12493/2324
dc.language.isoen
dc.publisherKabale University
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United Statesen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/
dc.subjectReflectance Absorbance Thermochromism Phosphors Bandgap Activation Energy
dc.titleDetermining Bandgap of Thermochromic Phosphor Films via Reflectance Measurements under Controlled Heating
dc.typeArticle

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Katashaya Steven Rwabona-2024-Research Article.pdf
Size:
668.74 KB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Faculty of Science (FSC)