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標題: | 應用於發光二極體之高穩定性鈣鈦礦量子點玻璃複合材料 Highly Stable Perovskite Quantum Dot Glass Composite Materials for Light Emitting-Diodes |
作者: | 劉擎 Ching Liu |
指導教授: | 劉如熹 Ru-Shi Liu |
關鍵字: | 鈣鈦礦量子點,CsPbBr3,表面基質包覆,複合材料,發光二極體, Perovskite,Quantum Dot,CsPbBr3,Encapsulation,Light-Emitting Diode, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 本研究藉熔融-焠火法(melt-quench method)與熱處理結晶法(heat treatment cystallization)將CsPbBr3鈣鈦礦量子點結晶析出於硼矽酸鹽玻璃基質中,藉硼矽酸鹽玻璃之高透光性、耐熱脆性、高表面硬度、高耐水性等性質,可大幅提升CsPbBr3鈣鈦礦量子點之穩定性。因熔融-焠火法相較於傳統之液相合成法幾無使用溶劑,使其具綠色化學特性、更加環保且玻璃基質亦可避免具高環境毒性之鉛離子釋出。此外,本研究亦藉差熱分析、原位穿透式電子顯微鏡影像、變溫X光繞射圖譜與紅外光吸收光譜探究CsPbBr3鈣鈦礦量子點於玻璃基質中之結晶行為、元素組成與玻璃之網路結構。因本研究所合成之CsPbBr3鈣鈦礦量子點玻璃(CsPbBr3@glass)原先呈板片狀,難以直接應用至發光二極體,故其須研磨為粉末狀。然研磨過程易破壞玻璃基質,導致部分CsPbBr3鈣鈦礦量子點暴露於空氣中而降低其穩定性。為解決此一問題,本研究將藉原子層沉積製程(atomic layer deposition; ALD)與溶膠-凝膠法(sol-gel method)於CsPbBr3@glass表面包覆緻密二氧化矽層與疏水二氧化矽層,配製CsPbBr3@glass@ASG鈣鈦礦量子點玻璃複合材料,以提升其穩定性。本研究所合成之CsPbBr3@glass@ASG具高螢光量子效率,其內部與外部量子效率依序為42.0%與33.7%。歷經7週之耐水性測試後,其可維持100%之原始螢光強度;於30oC–100oC間歷經連續5次之加熱-冷卻循環,其具100%之螢光熱回復性。本研究之新穎性乃為此一CsPbBr3@glass@ASG鈣鈦礦量子點玻璃複合材料兼具高量子效率、高耐水性與高螢光熱回復性之特性,故其於發光二極體與顯示器相關之應用具極高之潛力,而此CsPbBr3@glass@ASG鈣鈦礦量子點玻璃複合材料未來將可拓展鈣鈦礦量子點於顯示器或光學相關元件應用之可能性。 In this research, the melt-quench method and heat treatment crystallization method were applied to make CsPbBr3 perovskite quantum dots (PQDs) crystallize in the borosilicate glass matrix. With the high transmittance, high surface hardness, and high water resistance of the borosilicate glass, the stability of CsPbBr3 PQDs can be enhanced significantly. By comparing the melt-quench method with the traditional solution-state synthesis of CsPbBr3 PQDs, the melt-quench method was a kind of solvent-free synthetic process and it met the spirit of green chemistry. Besides, the glass matrix could prevent the toxic lead ions from releasing to the environment. In our research, differential thermal analysis, in-situ transmission electron microscopy, temperature-dependent X-ray diffraction, and infrared absorption spectroscopy were used to explore the crystallization process of CsPbBr3 PQDs in the glass matrix. In addition, because the grinding process for the as-prepared plate-like CsPbBr3@glass would destroy the glass protective layer, the stability of CsPbBr3 PQDs against the environment would reduce significantly. Thus, the atomic layer deposition and sol-gel method were applied to synthesize the compact SiO2 layer and hydrophobic SiO2 layer on the surface of CsPbBr3@glass, respectively, to fabricate the CsPbBr3@glass@ASG composite material. With the triple-layer protection of glass matrix, compact SiO2 layer, and hydrophobic SiO2 layer, CsPbBr3@glass@ASG possessed ~100% water resistance and ~100% thermal reversibility of photoluminescence during the water resistance test and heating-cooling cycle, respectively. Due to the significant enhancement in the stability of CsPbBr3 PQDs, CsPbBr3@glass@ASG might become the potential photoluminescent material for optoelectronic devices in the next generation. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/91490 |
DOI: | 10.6342/NTU202301067 |
全文授權: | 未授權 |
顯示於系所單位: | 化學系 |
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