Browsing by Author "Chou, Tzu-Lin"

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    Green Synthesis of InP/ZnS Core/Shell Quantum Dots for Application in Heavy-Metal-Free Light-Emitting Diodes
    (2017-09-19) Kuo, Tsung-Rong; Hung, Shih-Ting; Lin, Yen-Ting; Chou, Tzu-Lin; Kuo, Ming-Cheng; Kuo, Ya-Pei; Chen, Chia-Chun
    Abstract Quantum dot light-emitting diodes (QD-LEDs) have been considered as potential display technologies with the characterizations of high color purity, flexibility, transparency, and cost efficiency. For the practical applications, the development of heavy-metal-free QD-LEDs from environment-friendly materials is the most important issue to reduce the impacts on human health and environmental pollution. In this work, heavy-metal-free InP/ZnS core/shell QDs with different fluorescence were prepared by green synthesis method with low cost, safe, and environment-friendly precursors. The InP/ZnS core/shell QDs with maximum fluorescence peak at ~ 530 nm, superior fluorescence quantum yield of 60.1%, and full width at half maximum of 55 nm were applied as an emission layer to fabricate multilayered QD-LEDs. The multilayered InP/ZnS core/shell QD-LEDs showed the turn-on voltage at ~ 5 V, the highest luminance (160 cd/m2) at 12 V, and the external quantum efficiency of 0.223% at 6.7 V. Overall, the multilayered InP/ZnS core/shell QD-LEDs reveal potential to be the heavy-metal-free QD-LEDs for future display applications.
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    無重金屬量子點材料合成與發光二極體應用
    (2019) 周子琳; Chou, Tzu-Lin
    半導體量子點因具有獨特的發光特性，其具有高色彩純度、能階可調性與可延展性，將其應用於發光二極體為現今科技之趨勢，目前於應用端表現最好之量子點材料鎘，以及新興的無機鈣鈦礦量子點CsPbX3(X=Cl、Br與I)卻都因為其材料中重金屬的毒性而限制了其商用化的發展，對於環境的影響也是一大隱憂，因此目前許多研究都是為了尋求替代的材料。 　　本篇論文中，我們首先較安全便宜之六甲基三氨基磷作為前驅物用熱注射法合成無重金屬之磷化銦/硫化鋅核殼量子點，其合成出來之相對量子效率大約60.1%，放光之半高寬為42nm，並測試此材料之熱穩定度發現其在七十度時製作發光二極體元件具有最佳之量子效率，此元件開啟電壓5 V，在12 V時具有最高亮度160 cd/m2，在6.7 V時外部量子效率為0.223%，雖然此種效率還無法拿來實際應用，但其具有環保與低成本，在未來具有極高的潛力。 　　再來我們將CsPbCl3中的Pb使用錫與錳做取代，成功合成出量子點，對其做光學鑑定及結構鑑定，發現其吸收值隨錳比例增加而有藍移的現象，並具有螢光，雖然量子效率並不高，但此種材料也為無重金屬量子點開啟了新篇章。