Chen Ruixiang, Liang Ningning, Zhai Tianrui
School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, China.
Nat Commun. 2024 Feb 13;15(1):1331. doi: 10.1038/s41467-024-45311-1.
Linearly polarized organic light-emitting diodes have become appealing functional expansions of polarization optics and optoelectronic applications. However, the current linearly polarized diodes exhibit low polarization performance, cost-prohibitive process, and monochromatic modulation limit. Herein, we develop a switchable dual-color orthogonal linear polarization mode in organic light-emitting diode, based on a dielectric/metal nanograting-waveguide hybrid-microcavity using cost-efficient laser interference lithography and vacuum thermal evaporation. This acquired diode presents a transverse-electric/transverse-magnetic polarization extinction ratio of 15.8 dB with a divergence angle of ±30°, an external quantum efficiency of 2.25%, and orthogonal polarized colors from green to sky-blue. This rasterization of dielectric/metal-cathode further satisfies momentum matching between waveguide and air mode, diffracting both the targeted sky-blue transverse-electric mode and the off-confined green transverse-magnetic mode. Therefore, a polarization-encrypted colorful optical image is proposed, representing a significant step toward the low-cost high-performance linearly polarized light-emitting diodes and electrically-inspired polarization encryption for color images.
线性偏振有机发光二极管已成为偏振光学和光电子应用中颇具吸引力的功能扩展。然而，目前的线性偏振二极管表现出低偏振性能、成本高昂的工艺以及单色调制限制。在此，我们基于使用具有成本效益的激光干涉光刻和真空热蒸发的介电/金属纳米光栅 - 波导混合微腔，在有机发光二极管中开发了一种可切换的双色正交线性偏振模式。这种获得的二极管呈现出横向电/横向磁偏振消光比为15.8 dB，发散角为±30°，外部量子效率为2.25%，以及从绿色到天蓝色的正交偏振颜色。这种介电/金属阴极的光栅化进一步满足了波导与空气模式之间的动量匹配，衍射了目标天蓝色横向电模式和非受限绿色横向磁模式。因此，提出了一种偏振加密的彩色光学图像，这代表着朝着低成本高性能线性偏振发光二极管以及彩色图像的电激发偏振加密迈出了重要一步。
