| Summary: | 碩士 === 國立臺北科技大學 === 分子科學與工程系有機高分子碩士班 === 107 === Lead halide perovskites hold promise for photonic devices, due to their superior optoelectronic properties. However, their applications are limited because of its high ionicity and poor stability. In the research, we demonstrate a method of electrospinning to encapsulate perovskite quantum dots into hydrophobic polymeric matrices. The method is universal for most of the commercially available polymers, we use poly(styrene-butadiene-styrene), poly(methyl methacrylate), and polystyrene in this report. We discuss the differences of their optical and stability performance, and enhanced water and light stability of perovskite QDs. From SEM and TEM images, we can know the morphology of fibers and the distribution of perovskite. The results of contact angle measurements display CsPbBr3@PS fiber shows higher contact angle θ than the others. It also demonstrate high stability under water-soaking, it remains 83% of initial intensity after 3 months, it is corresponds to its high hydrophobicity. CsPbBr3@PS fiber illuminated by UV light (405 nm) for 6h in air also shows high stability, we suppose that PS can avoid water and air to form the traps and energy loss.
We also use biaxial electrospinning to fabricate core(CsPb(Br0.4I0.6)3 QDs) /shell(CsPbBr3 QDs) light-emitting nanofibers that include red and green perovskite. It apply on white light device that shows higher luminance of 1736 cd/m2 and luminous efficacy of 0.727 lm/W than uniaxial electrospinning due to its higher energy transfer. This work highlights the key factor of hydrophobicity of polymers to protect perovskite QDs from water and oxygen, and the technique of biaxial electrospinning shows higher luminance, higher luminous efficacy, and simple process to make white light device.
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