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Kaden Gammon
William Jewell College
NIST Research Intern
National Institute of Standards and Technology (NIST)
Final presentation
Magnetic sensors offer versatile applications across a broad range of industries. This project investigates thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLED) as a potential sensor for position-sensitive mapping in low (micro to milli Tesla) magnetic fields. These fields are mapped using the spatial variation in light intensity of the OLED resulting from the variations in exciton formation and population dynamics under a magnetic field. The exciton-based sensing modalities of these devices are evaluated by taking measurements of magneto-electroluminescence (MEL) and magnetoresistance (MR) while interacting with an external magnetic field. Comparing the light intensity of devices under differing external magnetic fields through optical imaging, the spatial resolution in light output is assessed as a method for magnetic field mapping of a layer of magnetic film or magnetic nanoparticles on an OLED. Furthermore, in conducting a life span study in a nitrogen gas glovebox, it is observed that OLEDs will better preserve device characteristics and maintain magnetic field sensitivity when encapsulated. Implications of this study on OLEDs for position-sensitive magnetic field sensing suggest that these devices could be used as an alternative option compared to traditional sensors.
My name is Kaden Gammon and I have just completed my third year at William Jewell College. Following the summer, I will finish my undergraduate studies at Washington University in St. Louis through their Dual Degree Engineering Program. In this program, I'm pursuing a B.A. in Physics from William Jewell College and a B.S. in Mechanical Engineering from Washington University in St. Louis. Once completed, I aim to follow my interests inapplied physics and engineering physics in graduate school.
Aside from my studies and involvement on campus, I love spending time with my friends, cycling, and especially traveling. I'm excited about this opportunity to intern at the National Institute of Standards and Technology and can't wait to meet everyone this summer!