White organic light-emitting diodes with fluorescent tube efficiency
White organic light-emitting diodes with fluorescent tube efficiency
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DOI：
10.1038/nature08003
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发表时间：
2009-05-14
期刊：
影响因子：
64.8
通讯作者：
Leo, Karl
中科院分区：
文献类型：
--
作者：
Reineke, Sebastian;Lindner, Frank;Leo, Karl
白色有机发光二极管（oled）的发展为高效大面积光源的生产带来了巨大的希望。电能到光的高内部量子效率已经实现（2-4）。尽管如此，整体设备的功率效率仍然远远低于荧光灯管的60-70流明每瓦，这是目前新型光源的基准。虽然存在一些关于高能效白色oled的报道（5,6），但有关这些结构的结构和测量条件的细节尚未完全披露：科学文献中报道的最高功率效率为44 lm W-1（参考文献7）。在这里，我们报告了一种改进的OLED结构，达到荧光管的效率。通过将精心选择的发射极层与高折射率衬底（8,9）相结合，并使用周期性解耦结构，我们在每平方米1,000坎德拉下实现了90 lm W-1的器件功率效率。如果能进一步改善光的外耦，该效率有可能提高到124 lm W-1。除了接近1的内部量子效率值外，我们还专注于减少电子-光子转换过程中发生的能量和欧姆损失。我们预计我们的结果将成为进一步研究的起点，导致白光oled的效率超过100 lm W-1。这可以制造出白光oled，具有柔和的面积光和高显色性，是未来的首选光源。
The development of white organic light-emitting diodes(1) (OLEDs) holds great promise for the production of highly efficient large-area light sources. High internal quantum efficiencies for the conversion of electrical energy to light have been realized(2-4). Nevertheless, the overall device power efficiencies are still considerably below the 60-70 lumens per watt of fluorescent tubes, which is the current benchmark for novel light sources. Although some reports about highly power-efficient white OLEDs exist(5,6), details about structure and the measurement conditions of these structures have not been fully disclosed: the highest power efficiency reported in the scientific literature is 44 lm W-1 (ref. 7). Here we report an improved OLED structure which reaches fluorescent tube efficiency. By combining a carefully chosen emitter layer with high-refractive-index substrates(8,9), and using a periodic outcoupling structure, we achieve a device power efficiency of 90 lm W-1 at 1,000 candelas per square metre. This efficiency has the potential to be raised to 124 lm W-1 if the light outcoupling can be further improved. Besides approaching internal quantum efficiency values of one, we have also focused on reducing energetic and ohmic losses that occur during electron-photon conversion. We anticipate that our results will be a starting point for further research, leading to white OLEDs having efficiencies beyond 100 lm W-1. This could make white-light OLEDs, with their soft area light and high colour-rendering qualities, the light sources of choice for the future.