Decoupling the Trade‐Off Between the Photosignal and Photonoise in Upconversion Devices Through a Solution‐Processed Nickel Oxide Interconnecting Layer

Author:

Hu Yuanhong1,Chen Lixiang1,Li Hao1,Jiang Haohong1,Wang Ke1,Li Ning2,Zhang Qiaoming1,Lei Yanlian1ORCID

Affiliation:

1. School of Physical Science and Technology Chongqing Key Lab of Micro&Nano Structure Optoelectronics Southwest University Chongqing 400715 China

2. School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing Jiangsu 210094 China

Abstract

AbstractNear‐infrared (NIR) to visible upconversion devices (UCDs) provide a viable and cost‐effective way for NIR visualization and pixel‐less imaging techniques. An excellent electrical connection between the NIR detection unit and the visible emission unit in the UCD is one of the prerequisites for achieving efficient upconversion performance. In this study, a low temperature‐ and solution‐processed nickel oxide (NiOx) interconnecting layer (ICL) with high hole mobility and favorable energy levels is demonstrated to decouple the trade‐off between photosignal and photonoise in the UCDs. The use of such a NiOx ICL suppresses intrinsic visible emission in the dark (photonoise) but enhances visible light output under NIR illumination (photosignal) by triggering an efficient charge injection in the UCDs. As a result, a hybrid UCD monolithically integrating an organic NIR photodetector and a visible quantum dot light‐emitting diode via the NiOx ICL achieves excellent performance, exhibiting an ultralow turn‐on voltage as low as 1.6 V, a high luminance close to 6.3 × 103 cd m−2, a wide operation voltage window up to 7.4 V, and a high contrast ratio reaching 5 × 104. The resulting UCD is also used for imaging demonstrations showing clear visible images of the NIR targets, which paves the way for practical applications.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

Venture and Innovation Support Program for Chongqing Overseas Returnees

Publisher

Wiley

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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