金奈米團簇於發光元件之應用

Applications of gold nanoclusters in light-emitting diodes

10.6840/cycu201700042

鄭凱平

白光發光二極體 ； 奈米金 ； White light-emitting diodes ； Au NCs

中原大學物理學系學位論文

2017年

碩士

趙宇強

繁體中文

本論文將針對奈米金團簇混合藍色發光的有機主體材料作為有機發光 二極體之發光層進行研究與討論。藉由聲化學製備法(sonochemical method) 製成了製成了三辛基膦封蓋的黃色發光的金奈米團簇(TOP-capped Au NCs)， 本實驗使用的元件結構為ITO/PEDOT:PSS/EML/LiF/Al，藍色發光的PVK 材料和電子傳輸材料PBD、電洞傳輸材料TPD 以PVK:PBD:TPD=61:24:9 的體積比混合，再加入PVK、PBD、TPD 混合後的體積三倍量的金奈米團 簇旋轉塗佈形成主動層。利用載子誘捕、螢光共振能量轉移和界面的複合 狀態三種方式形成激子放出光，藍光和黃光同時被放出即會因為補色形成 白光，成功的製程出白光發光二極體，並利用儀器量測元件輝度、電流密 度、電流效率、發光效率、CIE 色度圖等光電特性，得到了電流效率0.32 Cd/A、 色度圖座標(0.27, 0.33)的元件效能，此色度圖座標非常接近純白光座標 (0.33, 0.33)。 且有別於傳統的發光二極體，想製成白光發光二極體需要多層發光層 互相補色，且使用的材料經常是有毒的元素，例如:鉛、鎘，在本實驗我們 第一次展示了白光發光二極體可以通過利用無毒和對環境無害的金奈米團 簇實現。

This thesis aims at realizing a light-emitting diode using which yellow-light-emitting gold nanoclusters were blend with blue-light-emitting orangic host materials as an emissive layer. The TOP-capped Au NCs were prepared by sonochemical method. The structure used in this thesis is ITO/PEDOT:PSS/EML/LiF/Al. Blue light-emitting host material PVK, electron transport material PBD, hole transport material TPD and yellow light-emitting material TOP-capped Au NCs blended with volume ratio(PVK:PBD:TPD:Au NCs =61:24:9:282. The excition generation can be achieved via charge trapping, Förster energy transfer from the host to the Au NCs, or through interfacial exciplex states. White light LEDs can be generated through mixing the electroluminescence from two complementary colors. Using the instrument measurement device brightness, current density, current efficiency, power efficiency and CIE chromaticity. We successfully demonstrated the white-LEDs based on non-toxic Au NCs with a current efficiency of 0.32 Cd/A and CIE chromaticity coordinates of (0.27, 0.33) were obtained from our experimental analysis, which is quite close to the ideal pure white emission coordinates (0.33, 0.33). However, the utilization of toxic elements such as lead cadmium in current optoelectronic devices on the basis of colloidal quantum dots raises environmental concerns. Here we demonstrate for the first time that white-light-emitting diodes can be achieved by utilizing non-toxic and environment-friendly gold nanoclusters.

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