Optical and electrical characteristics of organic light-emitting diodes with two-dimensional photonic crystals in organic/electrode layers
Optical and electrical characteristics of organic light-emitting diodes with two-dimensional photonic crystals in organic/electrode layers
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DOI：
10.1143/jjap.44.3669
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发表时间：
2005-06-01
期刊：
影响因子：
--
通讯作者：
Shimoji, N
中科院分区：
文献类型：
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作者：
Fujita, M;Ishihara, K;Shimoji, N
高效的光提取是提高有机发光二极管(OLED)整体效率的关键问题。通过引入光子晶体(PC)层，研究了OLED效率的提高，这有望实现对光子的多功能控制。我们在有机层和电极层中制作了二维PC结构，其中大部分光被限制在其中，以提取波导模中的光。与未加PC的样品相比，在光谱积分强度和前向光的峰值强度方面，OLED效率分别提高了20%和130%。随着有机层厚度的部分减小，发现较低的工作电压不会降低光提取效率。我们可以通过优化PC结构来进一步提高OLED的整体效率。
Efficient light extraction is a critical issue for improving the overall efficiency of organic light-emitting diodes (OLEDs). Improvements in OLED efficiency are studied via the introduction of photonic crystal (PC) layers, which are expected to enable versatile control of photons. We fabricate two-dimensional PC structures in organic and electrode layers, in which most light is confined, to extract the light in the waveguide mode. Improvements in OLED efficiency of 20 and 130% are observed in spectrally integrated intensity and the peak intensity of forward-propagating light, respectively, in comparison with samples without PCs. As the thickness of the organic layer is partially reduced, lower operating voltages are found not to degrade light-extraction efficiency. We can expect further improvement in the overall OLED efficiency by optimizing PC structure.