Adjustable white-light emission from a photo-structured micro-OLED array.
Adjustable white-light emission from a photo-structured micro-OLED array.
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DOI：
10.1038/lsa.2016.121
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发表时间：
2016-07
期刊：
影响因子：
--
通讯作者：
Reineke S
中科院分区：
文献类型：
--
作者：
Krotkus S;Kasemann D;Lenk S;Leo K;Reineke S
白色有机发光二极管（OLED）是未来固态照明应用和大面积显示器中背板照明的有希望的候选者。OLED的一个非常具体的特征是，它们可以实现可调谐的白色光发射，这是目前正在获得的势头。该特征通常通过发射不同颜色的独立OLED的垂直堆叠或OLED的横向布置来实现。垂直设计在光学上难以优化，并且经常导致单元之间的效率折衷。相比之下，横向概念向子单元之间的暗区域引入严重的面积损失，这需要显著更大的总器件面积来实现相等的亮度。在这里，我们展示了一个颜色可调的，双色OLED器件实现并排排列的黄色和蓝色的p-i-n OLED结构的低至20 μm的一个简单的和可升级的正交光刻技术。这种布局通过利用所有区域用于光发射来消除传统横向方法的问题。可以在从黄色到白色到蓝色的宽范围内调谐光图案化的两单元OLED的相应发射。不同单元的独立控制允许将所需的整体光谱设置在任何给定的亮度水平。作为白色光源工作时，微结构OLED在1000 cd m-2下达到13 lm W-1的发光效率，而没有额外的光输出耦合增强，并且当在色点E附近工作时达到68的显色指数。最后，我们展示了一个改进的器件寿命的子单元的大小变化的装置。
White organic light-emitting diodes (OLEDs) are promising candidates for future solid-state lighting applications and backplane illumination in large-area displays. One very specific feature of OLEDs, which is currently gaining momentum, is that they can enable tunable white light emission. This feature is conventionally realized either through the vertical stacking of independent OLEDs emitting different colors or in lateral arrangement of OLEDs. The vertical design is optically difficult to optimize and often results in efficiency compromises between the units. In contrast, the lateral concept introduces severe area losses to dark regions between the subunits, which requires a significantly larger overall device area to achieve equal brightness. Here we demonstrate a color-tunable, two-color OLED device realized by side-by-side alignment of yellow and blue p-i-n OLEDs structured down to 20 μm by a simple and up-scalable orthogonal photolithography technique. This layout eliminates the problems of conventional lateral approaches by utilizing all area for light emission. The corresponding emission of the photo-patterned two-unit OLED can be tuned over a wide range from yellow to white to blue colors. The independent control of the different units allows the desired overall spectrum to be set at any given brightness level. Operated as a white light source, the microstructured OLED reaches a luminous efficacy of 13 lm W−1 at 1000 cd m−2 without an additional light outcoupling enhancement and reaches a color rendering index of 68 when operated near the color point E. Finally, we demonstrate an improved device lifetime by means of size variation of the subunits.
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