Document Type

Journal Article

Department/Unit

Department of Physics

Language

English

Abstract

Near‐infrared (NIR) to visible light upconversion is of significant importance in many applications, including thermal imaging, bioimaging, night vision, and wellness monitoring. Here, the effort to develop a high‐performing NIR to saturated green light upconversion device comprising a front solution‐processable organic bulk heterojunction NIR charge generation layer (CGL) and an upper CsPbBr3 perovskite light‐emitting diode (LED) unit is reported. The NIR CGL, based on a blend of the NIR‐sensitive donor polymer and a nonfullerene acceptor, enables an efficient hole injection in the CsPbBr3 LED in the presence of the NIR light and also serves as an optical outcoupling layer to enhance the visible light emission by the CsPbBr3 LED. The CsPbBr3‐based perovskite LED has a narrow emission spectrum with a peak wavelength of 520 nm, corresponding to the wavelengths near the peak response of the human eye, and has the advantage in imaging applications. Based on the upconversion process, a pixel‐less NIR to visible light imaging device is demonstrated, which can be operated at a low voltage of 3 V. The results are very encouraging, revealing a high‐performing solution‐processable upconversion device for application in NIR light imaging.

Keywords

NIR to visible light up-conversion, nonfullerene acceptor, perovskite LED, NIR imaging

Publication Date

12-2018

Source Publication Title

Advanced Optical Materials

Volume

6

Issue

24

Publisher

Wiley

DOI

10.1002/adom.201801084

Link to Publisher's Edition

https://doi.org/10.1002/adom.201801084

ISSN (electronic)

21951071

Available for download on Tuesday, December 17, 2019

Included in

Physics Commons

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