DESIGN AND CONSTRUCTION OF A TIME-RESOLVED OPTICALLY STIMULATED LUMINESCENCE MEASUREMENT SYSTEM

Date

2024-8-27

Author

Boztemur, Deniz Orhun

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Pulsed Optically Stimulated Luminescence (POSL) has become one of the dominant measurement modalities in recent decades for its ability to measure the absorbed radiation dose in wide bandgap solids. Time-Resolved OSL is a variant of POSL in which the luminescence decay of an irradiated sample, after a stimulation pulse, is recorded and analyzed and can be used for the separation of luminescence signals from recombination centers with different decay constants. In multi-mineral samples, analysis can help discriminate phases using decay data. In some insulators, different radiation types may induce distinct types of defects with dissimilar decays; in such a case, discrimination of the radiation type becomes feasible. In radiation dosimetry, conventionally microcrystalline materials have been employed; synthesis of dosimeter materials based on nanoparticles has proven that these materials offer high sensitivity and reproducibility that may overtake conventional materials. Synthesis and usage of new materials require an understanding of the electron storage and luminescence recombination centers. Combined with spectral information, TR-OSL gives valuable information about the recombination processes. This thesis will cover the process of designing, constructing, and testing an open-sourced TR-OSL measurement system for the study of luminescence mechanisms in nanoparticle and microcrystalline materials. The device will be based on two stimulation wavelengths (λp~470 and λp~850 nm) and could be used for the analysis of luminescence decays with lifetimes of around 100 ns to seconds. Using the measurement system materials including Al2O3:C and BeO and similar ones will be investigated.

Subject Keywords

Physics, Micro and Nanotechnology, Instrumentation Physics, Solid State Physics, Luminescence, Optically Stimulated Luminescence, Time-Resolved Optically Stimulated Luminescence, Condensed Matter Physics, Solid State Physics, Radiation Physics, Scientific Instrumentation

URI

https://hdl.handle.net/11511/111306

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Graduate School of Natural and Applied Sciences, Thesis