Author Affiliations
Abstract
1 College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China
2 College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
Halide perovskites have attracted great attention due to their high color purity, high luminance yield, low non-radiative recombination rate, and solution processability. Although the external quantum efficiency of perovskite light-emitting diodes (PeLEDs) is comparable with that of the organic light-emitting diodes (OLEDs) and quantum-dots light-emitting diodes (QLEDs), the brightness is still low compared with the traditional OLEDs and QLEDs. Herein, we demonstrate high brightness and high-efficiency -based PeLEDs using interface and bulk controlled nanocrystal growth of the perovskite emission layer. The interface engineering by ethanolamine and bulk engineering by polyethylene glycol led to highly crystallized and cubic-shaped perovskite nanocrystals with smooth and compact morphology. As a result, PeLEDs with a high brightness of and an external quantum efficiency of 13.4% have been achieved.
perovskite light-emitting diodes morphology engineering ethanolamine polyethylene glycol Chinese Optics Letters
2021, 19(3): 030001
1 北京理工大学 光电学院 光电成像技术与系统教育部重点实验室, 北京 100081
2 北京理工大学 宇航学院 飞行器动力学与控制教育部重点实验室, 北京 100081
利用积分球对近红外增强相机进行了可见、近红外波段的辐射定标, 并采用该相机采集了典型目标的可见、近红外图像.利用便携式地物光谱仪采集了相同目标可见、近红外波段的光谱反射率曲线, 并分析了目标在可见、近红外波段的光谱反射特性.通过寻找同一天气条件、同一时间段所拍摄的典型目标近红外图像灰度值与可见光图像灰度值及典型目标可见、近红外波段反射率之间的关系, 提出一种基于可见光图像及目标反射率反演近红外图像的算法.在近红外图像反演过程中考虑了大气透过率的影响, 反演结果表明, 本文算法可以较好地体现典型目标近红外图像的全局特征, 为后续不同天气条件下近红外场景仿真的实现提供参考.
物理光学 近红外场景仿真 辐射定标 辐亮度 图像灰度 反射率 大气透过率 Physical optics Near infrared scene simulation Radiometric calibration Radiance Digital number Reflectance Atmospheric transmittance
