ENGINEERING OF PEROVSKITE COMPOSITE MATERIALS FOR OPTOELECTRONIC APPLICATIONS

Abstract

The potential application of perovskite nanocrystals (PNCs) in future optoelectronic devices is growing rapidly because of their adjustable bandgap properties, narrow emission linewidths and their high photoluminescence quantum yield (PLQY). Their operational deployment faces severe limitations because they become unstable when subjected to environmental elements like moisture, oxygen, heat, and light. This thesis studies various polymer matrices such as PMMA, PDMS, and PMHS for encapsulating perovskite quantum dots (PQDs) to improve their environmental durability while preserving their optical properties. PMMA facilitated the production of stable films resistant to water while the creation of SiO2-based core-shell structures provided enhanced protection that significantly increased stability during extended water exposure. PDMS provided superior processability and flexibility for downconversion and LED encapsulation applications but presented moderate intensity trade-offs. Despite its mechanical brittleness and optical quenching properties PMHS enabled the development of a PQD powder which expanded its application range. The comparative analysis of the polymers revealed their individual strengths and limitations which indicated that choosing the appropriate material depends on specific application requirements. PDMS and PMMA-based composite tactile sensors provided practical demonstrations where PQD markers enabled accurate force-sensitive tracking when activated by UV light. The performance of PQD-polymer composites demonstrated their wide-ranging capabilities. Research results demonstrate that merging polymer engineering with quantum dot surface modifications like core-shell techniques broadens the functional scope of perovskite nanomaterials.