高效率高穩定性之CdTe膠體量子點之薄膜及發光二極體

本論文中，我們提出了新的膠體量子點（CQD）薄膜和發光二極體。將CdTe的膠體量子點嵌入在氯化鈉（NaCl）中製成離子晶體，以防止從外部接觸，接著在玻璃基板上測量這種粉末與PDMS混合之有機薄膜的光致發光（PL）情形。利用不同的堆疊方式，在多層條件下可以找出較好的發光強度。膠體量子點/氯化鈉複合材料和聚合物的混合物可以填充在LED中，使其受光激發。由於氯化鈉顆粒帶來額外散射，在中等電流下所得到的光致發光量子效率（PLQY）可高達72.6％。本文裡設置了兩種不同的封裝方式作為長期穩定性的評估。在這些封裝條件下，膠體量子點隨時間的光輸出穩定性得以改善，本文展示了該量子點在連續UV老化條件下可長達6488小時的生命週期。

關鍵字

膠體量子點；薄膜；發光二極體

並列摘要

In this thesis, we proposed the novel colloidal quantum dot (CQD) thin film and light-emitting devices. The CdTe colloidal quantum dots are embedded in the sodium chloride (NaCl) ionic crystal to prevent from external wear. The photoluminescence (PL) with this kind of powder, mixed with organic film (PDMS) on glass substrate, was measured. Under different overlapping manner, a better PL intensity can be found at multiple layers condition. The mixture of colloidal quantum dots/NaCl composite and polymer can be filled inside the standard LED package and optically pumped by the UV LED. Due to extra scattering brought by the sodium chloride grains, the resultant photoluminescent quantum yield (PLQY) can be as high as 72.6% at the medium current level. For the long-term stability assessment, two different UV pumping were set up. With this encapsulation, the stability of the colloidal quantum dot light output over time can be improved, and a prolonged 6488-hour of lifetime can be demonstrated under the continuous UV aging condition.

並列關鍵字

CdTe ； Colloidal-Quantum-Dot ； LED ； thin film

參考文獻

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[6] K.J. Chen, H. C. Chen, K. A. Tsai, C. C. Lin, H. H. Tsai, S. H. Chien, et al., “Resonant‐Enhanced Full‐Color Emission of Quantum‐Dot Based Display Technology Using a Pulsed Spray Method”, Advanced Functional Materials, 22, 5138-5143, (2012).

[7] K.J. Chen, C.C. Lin, H.W. Han, C.Y. Lee, S.H.Chien, K.Y.Wang, S.H. Chiu, Z.Y. Tu, J.R. Li, T.M. Chen, X.Li, M.H. Shih, H.C. Kuo ,“Wide-Range Correlated Color Temperature Light Generation From Resonant Cavity Hybrid Quantum Dot Light-Emitting Diodes”, IEEE Journal, Vol. 21, No. 4, July/August 2015

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高效率高穩定性之CdTe膠體量子點之薄膜及發光二極體

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