Tailored Polarization Conversion and Light‐Energy Recycling for Highly Linearly Polarized White Organic Light‐Emitting Diodes,Laser & Photonics Reviews

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Tailored Polarization Conversion and Light‐Energy Recycling for Highly Linearly Polarized White Organic Light‐Emitting Diodes
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-06-05 , DOI: 10.1002/lpor.201900341
Lei Zhou ₁ , Yun Zhou ₂ , Bao‐Lu Fan ₁ , Feng Nan ₁ , Guang‐Hong Zhou ₁ , Yuan‐Yuan Fan ₁ , Wen‐Jun Zhang ₃ , Qing‐Dong Ou ₄

Affiliation

Directly linearly polarized light emission from organic light‐emitting diodes (OLEDs), as an important functional expansion, is an intriguing and attractive research topic due to its increasing importance in various applications. Until now, however, the limited efficiency and inadequate polarization ratio constitute two major hurdles for real application. In this work, high‐efficiency linearly polarized white OLEDs with an ultrahigh polarization ratio are achieved by using integrated dielectric/metal nanograting and nanorelief speckle image holography metasurfaces. In the devices, the integrated grating behave as a polarizer to select the transverse magnetic wave (TM) component and simultaneously reflect the transverse electric wave (TE) counterpart over the whole emission spectrum, while the metasurfaces gather the otherwise waste TE‐polarized light reflected by the grating and transform it into reusable TM‐polarized light. This synergistic energy‐light recycling system leads to dramatically boosted device efficiency and polarization ratio, i.e., a power efficiency 21.4 lm W⁻¹ (@ 1000 cd m⁻²), and an extinction ratio of 17.8 dB (@ V = 5 V) for the polarized white OLEDs. The presented paradigm for simultaneous polarization controlling and efficiency boosting in white OLEDs is expected to advance the OLED techniques in device reconfigurability for future multifunctional applications.

中文翻译：

高线性偏振的白色有机发光二极管的量身定制的偏振转换和光能回收

作为重要的功能扩展，来自有机发光二极管（OLED）的直接线性偏振光发射，由于其在各种应用中的重要性日益增加，因此是一个有趣且有吸引力的研究主题。然而，到目前为止，效率有限和极化比不足构成了实际应用的两个主要障碍。在这项工作中，通过使用集成的电介质/金属纳米光栅和纳米浮雕斑点图像全息超表面，可以实现具有超高偏振比的高效线性偏振白色OLED。在这些设备中，集成光栅充当偏振器，以选择横向电磁波（TM）分量，并同时在整个发射光谱中反射横向电波（TE）对应物，而超颖表面则收集了原本由光栅反射的TE偏振光，并将其转换为可重复使用的TM偏振光。这种协同的能量光回收系统可显着提高设备效率和极化率，即功率效率为21.4 lm W^-1（@ 1000 cd m ^-2），并且偏振白色OLED的消光比为17.8 dB（@ V = 5 V）。预期在白色OLED中同时进行偏振控制和提高效率的范例有望在未来多功能应用的设备可重构性方面推动OLED技术的发展。

更新日期：2020-06-05

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