應用CdSe/ZnSe 量子點於白光二極體螢光粉之研究

Studies and Applications of CdSe/ZnSe Quantum Dots for White LED's Phosphors

林志豪(Chih-How Lin)

指導教授 ： 施漢章

國立清華大學/工學院/材料科學工程學系/碩士(2006年)

https://doi.org/10.6843/NTHU.2006.00161

摘要

我們提出了一個嶄新的方法來量測量子點於室溫下之穩定性，我們結合InGaN晶片與油相合成之量子點來製作發光二極體元件，此外亦設計了一個可以確保每次量測位置之基座來做穩定度之量測。雖然應用量子點為發光二極體之螢光粉在製作上更為容易，然而，量子點本身卻因為與表面層之晶格常數差異，光氧化，熱聚集等效應之影響而呈現不穩定之現象，因此我們將CdSe/ZnSe量子點以高分子聚合反應的方式封入甲基丙烯酸甲酯(PMMA)中以防止其分散與氧化，藉由以上方法即可以大幅提高量子點應用於發光二極體螢光粉之可能性，進而取代現行常用之YAG螢光粉。最後我們利用以上之技術來製作白光二極體，不僅穩定性大幅提升，且在發光效率也有很顯著之提升。

關鍵字

量子點 ； 發光二極體

並列摘要

We present a novel method for detecting the quantum dots’ (QDs) stability at room temperature. The device is fabricated by combining blue InGaN chips with luminescent colloidal core-shell CdSe-ZnSe QDs. We design a simple holder to fix the SMD-LED for ensuring detected position always the same. Although using the QDs as phosphor for the fabrication of LED is more easily, however, the QDs are unstable owing to lattice mismatch, photooxidation and thermal aggregation. Therefore, we encapsulate QDs into PMMA to protect QDs from oxidation and aggregation. By this way we can improve the stability of QDs at room temperature which increases the feasibility for replacing the phosphors such as YAG with QDs. Finally，we use this technique to fabricate WLED(White Light Emitting Diode)，it not only shows the good stability but also exhibits good properties on efficiency and purity of white light.

並列關鍵字

CdSe ； LED