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HIGH EFFICIENCY ORGANIC LIGHT EMITTING DEVICES DEVELOPED BY FRESNAL'S THEORY

利用弗雷斯纳尔理论开发的高效有机发光器件

基本信息

批准号：
16550158
负责人：
MIKAMI Akiyoshi
金额：
$ 1.41万
依托单位：
Kanazawa Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

We investigated on optical properties in organic light emitting devices on the basis of the wave optics by Fresnel's theory, and developed very high efficiency deep-blue and white emission. Research results are summarized as follows.1.A high-efficiency deep-blue OLED has been developed in the device consisting of dye-doped polymer layer and light-emitting α-NPD layer. The optimized device showed very high external-quantum-efficiency of 6.0% with keeping deep-blue color of CIE color coordinates (0.15,0.07).2.A high efficiency white-OLED has been developed based on a Side-Coupling-Color-Conversion-Method (SC3M), in which the blue emission from an organic layer is laterally transferred to an adjacent orange color-conversion material. A white-OLED with SC3M structure showed an external quantum efficiency of 8.9%.3.Optical behavior of multi-stacked thin film devices has been evaluated by using a newly developed optical simulator for OLEDs. It was found that the outcoupling efficiency(ηo) strongly depends on the width of the emission zone near the interface between organic layers. According to our new theoretical analysis based on the Fresnel's analysis and characteristic matrix, a maximum efficiency approaches approximately 35% when the light-emitting layer is carefully designed with keeping confined emission zone.In conclusion, the emission efficiencies of blue and white OLEDs was significantly improved by optical design based on Fresnel's analysis. These results will be utilized for the development of very high efficiency organic light source in the next research stage.

本文以波动光学理论为基础，利用菲涅耳理论研究了有机电致发光器件的光学特性，并开发出了高效率的深蓝色和白色发光器件。主要研究结果如下：1.在由染料掺杂聚合物层和α-NPD发光层组成的器件中，研制了一种高效率的深蓝色OLED。优化后的器件在保持CIE色坐标（0.15，0.07）的深蓝色的同时，具有很高的外量子效率，达到6.0%。2.基于侧耦合色转换法（SC 3 M），将蓝光从有机层横向转移到相邻的橙子色转换材料，研制了一种高效白光OLED。一个具有SC 3 M结构的白光OLED显示出8.9%的外量子效率。3.利用一个新开发的OLED光学模拟器对多层薄膜器件的光学行为进行了评估。结果表明，外耦合效率（ηo）强烈依赖于有机层界面附近发光区的宽度。根据我们基于菲涅耳分析和特征矩阵的理论分析，当发光层经过精心设计并保持有限的发光区时，最大效率接近35%，因此基于菲涅耳分析的光学设计可以显著提高蓝光和白色OLED的发光效率。这些结果将用于下一研究阶段的极高效有机光源的开发。