Novel and Highly Efficient White Light-Emitting Devices

Recently, white light-emitting diodes (LEDs) have been regarded as the next generation of lighting sources because of its long lifetime, high efficiency, and energy-saving properties, especially in solid-state lighting (SSL). In the first part of this study, the effect of ZrO_2-nanoparticle doping in the package was investigated to enhance the uniformity of correlated color temperature (CCT) and luminous flux. Combined with its low cost, easy fabrication, and superior optical characteristics, ZrO_2 nanoparticles can be an effective performance enhancer for the future generation of white light-emitting devices. In the second part, pulsed spray coating method is employed to spray uniform RGB layers, and the polydimethylsiloxane (PDMS) film was used as the interface layer between each RGB color to avoid cross-contamination and self-assembly of QDs. Moreover, pixelated RGB arrays, 2-in. wafer-scale white light emission, and an integrated small footprint white light device were demonstrated.

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並列摘要

白光發光二極體具有壽命長、效率高與節能之優點，已成為新世代照明中極為重要之光源。為使白光二極體更趨廣泛，發展高亮度與高均勻性白光發光二極體為目前相當重要課題。於第一部份研究中，為同時提高白光發光二極體發光亮度與光均勻性，我們摻雜高散射特性之次微米氧化鋯奈米粒子於白光發光二極體中，不僅可提高藍光利用率以增進發光效率，並且可提高大角度藍光之光萃取，解決嚴重黃圈現象，此結構可產生高效率且高品質之白光。於第二部分研究利用脈衝噴塗技術噴塗紅綠藍三色硒化鎘／硫化鋅（CdSe/ZnS）量子點發展高均勻性量子點單色與白光光源，成功製作紅綠藍像素陣列圖形與白光發光光源。此外，為提高發光效率，搭配布拉格反射結構（Distributed Bragg Reflector; DBR），增加紫外光之反射，提高紅綠藍三色量子點亮度。而透過紅、綠、藍量子點所製作的白光背光模組可以大幅的拓寬顯示器的色域，使色域達到NTSC 135%之高飽和度表現。

並列關鍵字

白光發光二極體；量子點螢光粉

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