使用錸或鋨金屬磷光錯合物之白光有機發光元件

Efficient White Organic Light-Emitting Devices With the Rhenium or Osmium Complexes

石智瑤(Chin-Yao Shin)

指導教授 ： 張志豪

元智大學/電機通訊學院/光電工程學系/碩士(2012年)

摘要

近年來，由於白光有機發光二極體應用於全彩顯示器與固態照明上的各項優點，使此項技術研究備受矚目，理論上，磷光有機發光材料能利用單重態激子及三重態激子放光，所以可實現高效率有機發光元件，因此當前許多研究團隊研究重點皆放在開發高效率的磷光材料及白光結構設計。

本論文目標致力於使用簡化元件架構，開發高效率、高色穩定能力之白光有機發光元件，在論文第一部分，我們使用新穎黃色磷光發光材料，其材料設計以雙核錸金屬為中心結構，相較於早期錸金屬發光錯合物，擁有優異的量子產率，具有能增進白光元件之色飽和度之潛力，本論文以此黃色磷光材料進行高效率黃光及白光元件製作。

在論文第二部分，我們使用新穎鋨金屬錯合物紅色磷光材料，搭配適合的藍色磷光材料，採用簡化架構設計，製作高色穩定之白光元件，雙發光層架構將有助於提高複合機率及定義出激子形成區，最佳元件在大亮度範圍下維持光色穩定，最高效率為11.8%、23.8cd/A及23.3 lm/W，此新穎架構可作為未來白光元件設計之參考。

關鍵字

白光有機發光元件 ； 錸金屬磷光錯和物 ； 鋨金屬磷光錯合物

並列摘要

White organic light-emitting diodes (WOLEDs) has continued to attract intensive interest for recent years due to their applications in full color flat-panel and solid-state lighting. Theoretically, phosphorescent OLEDs (PhOLEDs) can achieve unity internal quantum efficiency through using both singlet and triplet excitons. Thus, development of efficient phosphorescent materials and device architecture are remained hot topics for researchers.

The first part of this thesis focuses on the device architecture designs based on the newly developed dinuclear carbonyl rhenium complexes. The efficient use of these rhenium complexes as emitting material in vacuum-processed PhOLEDs gives devices with maximum EQE of 10%. These values are the highest ever reported for PhOLEDs with rhenium-based phosphors, undoubtedly comparable with state-ofthe-art devices employing platinum-based triplet emitters, and approaching efficiencies of iridium-based dopants.

The second portion, we focused on the development of efficient WOLEDs through two phosphors which possessed complementary colors. By employing double emitting layers, the opposite carrier-transport characteristics of two host materials were leveraged to define the exciton formation zone and thus increase the probability of recombination.The optimized device exhibited stable colors over a wide brightness range of 100 to 1000cd/m2 and EL efficiencies of up to 11.8%、23.8cd/A and 23.3lm/W. This simplified architecture promises a bright future for WOLEDs.

並列關鍵字

White Organic Light-Emitting Devices ； Rhenium Complexes ； Osmium Complexes

參考文獻

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