Nowadays, there have been ongoing efforts to modify naturally sourced plastic fat or create trans-free plastic fats with desirable physicochemical and nutritional properties over the past several decades 5−8) .The nutritional properties of fat are closely associated with its fatty acid (FA) composition, degree of unsaturation, fatty acid chain length and the position of fatty acid acyl chain 7) . It is known that ω-6 and ω-3 fatty acids differ in metabolism and functions, and imbalanced dietary ω-6/ω-3 ratio eventually promote the pathogenesis of many diseases, including cardiovascular disease, cancer, rheumatoid arthritis, and asthma 9) . The ω-6/ω-3 FA ratio from 1:1 to 4:1 is recommended to lower the risks of obesity and chronic disease and support the brain development of infants 10) . There are plenty of reports involving the preparation of plastic fat with functional components (bioactive phytochemicals, polyunsaturated fatty acids, medium chain triacylglycerols) through EIE 6, 11−13) . Cottonseed stearin (CS) ,
All-inorganic cesium lead halide perovskites are emergent semiconductors as excellent light emitters. With the ease of synthesis, high quantum efficiency, large absorption coefficient and seamlessly tunable bandgap, all-inorganic cesium lead halide perovskites are regarded as ideal semiconductor system to compensate traditional semiconductors towards high performance optoelectronic applications. In this thesis, I mainly focus on investigating lightmatter interaction properties in cesium lead halide perovskites towards future optoelectronic applications. The investigation starts from the synthesis of all-inorganic cesium lead halide perovskite crystals with excellent quality. A van der Waals (vdW) epitaxy technique is introduced in synthesizing all-inorganic cesium lead halide perovskite crystals based on a one-step vapor phase synthesis method. High quality cesium lead halide perovskite nanoplatelet crystals and large films can be obtained with excellent crystallinity and strong emissions. The emission of cesium lead halide perovskites can be seamlessly tuned from 1.7 eV to 3.0 eV by composition modulations. Most of the cesium lead halide perovskites are confirmed to possess stale excitons at room temperature by the absorption spectroscopy. Large exciton binding energies of ~ 37 meV for CsPbBr3 and ~ 70 meV for CsPbCl3 are extracted from the analysis of temperaturedependent exciton absorption peak linewidth behavior. With naturally square structure and sharp edges, cesium lead halide perovskite nanoplatelet crystals serve as excellent whisper gallery mode microcavities. These cesium lead halide perovskite microcavities exhibit lasing with low threshold ranging from 2.0 μJ/cm 2 (peak power density of 2.0 × 10 7 W/cm 2) to 10.0 μJ/cm 2 (peak power density of 1.0 × 10 8 W/cm 2) and high quality factor over 3600. Multicolor lasing actions can also be realized by composition engineering in cesium lead halide perovskite crystals, ranging from blue region to red region.
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