A high-performance dual-functional organic upconversion device with detectivity approaching 10<sup>13</sup> Jones and photon-to-photon efficiency over 20%

He, Zeyu; Zhang, Heng-yuan; Du, Xiaoyang; Yu, Xin; Han, Jiayue; Cao, Luye; Lin, Hui; Wang, Jun; Zheng, Caijun; Tao, Silu

doi:10.1039/d3mh01337e

Mater. Horiz.

2023

DOI: 10.1039/d3mh01337e

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A high-performance dual-functional organic upconversion device with detectivity approaching 10¹³ Jones and photon-to-photon efficiency over 20%

Zeyu He,

Heng-yuan Zhang,

Xiaoyang Du

et al.

Abstract: A high-performance dual-functional organic upconversion device with detectivity approaching 1013 Jones and photon-to-photon efficiency over 20% was realized and pulse-state testing and bio-imaging were realized with high-quality results.

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Cited by 4 publications

References 52 publications

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Photomultiplication Enabling Efficient Shortwave Infrared‐Sensitive Organic Upconversion Devices

Hu,

Assunção,

Carvalho

et al. 2024

Adv Funct Materials

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Organic upconverters made by integrating an infrared‐sensitive photodetector with a light‐emitting diode offer a low‐cost route to visualize images taken in the infrared. However, making such devices sufficiently efficient is challenging. Here, upconversion devices are demonstrated with an efficiency of 13.9% for converting infrared photons (980 nm, 5 mW cm−2) to visible photons (575 nm). Infrared photons are detected with a photomultiplication photodetector that includes a copper thiocyanate electron‐blocking/injection layer and an infrared‐sensitive squaraine dye dispersed (3 wt−%) in a fullerene matrix. At turn‐on, the detector achieves an external quantum efficiency of 1200% (at 1020 nm, −10 V, 44 µW cm−2). Photomultiplication occurs via hole trap‐induced injection of electrons. In the upconverter, these electrons are driven into the emitter and recombine with holes under visible light emission. During operation the photodetector current increases because, presumably, rearranging mobile ions in copper thiocyanate narrows the injection barrier. Thereby, the upconverter photoconversion efficiency gradually increases to 18.7%. The performance of the present upconverter is limited by the not‐yet‐ideal charge‐blocking/injection layer, which is too thick and blocks electrons in the dark insufficiently. With thin and compact charge‐blocking layers at hand, the device concept paves the way for widespread use in sensitive infrared imaging.

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Photomultiplication Enabling Efficient Shortwave Infrared‐Sensitive Organic Upconversion Devices

Hu,

Assunção,

Carvalho

et al. 2024

Adv Funct Materials

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Ternary Compensation Enables High‐sensitive Efficient Upconversion Device for NIR Visualization

Dong,

Li,

et al. 2024

Advanced Materials

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Beyond the crystalline photodiodes for infrared visualization, with the limitation of opacity and complex lithographic processes, organic upconversion device (UCD) have emerged as a potential alternative. In this research, a ternary compensation strategy is implemented in a non‐fullerene‐based active layer to reduce the dark current of the detector and enhance its detection performance, which enables high‐sensitive efficient upconversion device for near‐infrared light (NIR) visualization. The device achieves an infrared‐to‐visible upconversion efficiency of 16.68% when resolving the 980 nm infrared signal at a power density of 0.4 mW cm−2. In addition, by replacing the semitransparent matrix electrodes, a large‐area (12.25 cm2) is further fabricated, lightweight (6.5 g containing encapsulation), pixel‐less (equivalent resolution 1270 ppi), and semitransparent (AVT ≈40%) UCD with microsecond response time. The fabricated UCD is demonstrated in pixel‐less active infrared naked‐eye visualization and infrared counter‐surveillance, fostering the advancement of infrared visualization technology.

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Effective exciplex system with high emission efficiency via intramolecular hydrogen bonding for efficient solution processable OLEDs

Lai,

Wang,

Liu

et al. 2024

Sci. China Mater.

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A high-performance dual-functional organic upconversion device with detectivity approaching 10¹³ Jones and photon-to-photon efficiency over 20%

Abstract: A high-performance dual-functional organic upconversion device with detectivity approaching 1013 Jones and photon-to-photon efficiency over 20% was realized and pulse-state testing and bio-imaging were realized with high-quality results.

Cited by 4 publications

References 52 publications

Photomultiplication Enabling Efficient Shortwave Infrared‐Sensitive Organic Upconversion Devices

Photomultiplication Enabling Efficient Shortwave Infrared‐Sensitive Organic Upconversion Devices

Ternary Compensation Enables High‐sensitive Efficient Upconversion Device for NIR Visualization

Effective exciplex system with high emission efficiency via intramolecular hydrogen bonding for efficient solution processable OLEDs

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