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Weak Near-Infrared Light Visualization Enabled by Smart Multifunctional Optoelectronics.

Pengqing Bi1, Jianqiu Wang2, Zhihao Chen2

  • 1Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology, and Research (A*STAR), 2 Fusionopolis Way, Singapore, 138634, Singapore.

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Summary
This summary is machine-generated.

A novel organic optoelectronic device enables clear visualization of weak near-infrared (NIR) light by integrating photodetection and light-emitting diode functions. This smart system automatically compensates for low light, enhancing visualization and enabling self-powered operation.

Keywords:
NIRenergy harvestinglight‐emittingmultifunctionalorganic optoelectronicsphoton upconversion

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Area of Science:

  • Organic optoelectronics
  • Photon upconversion
  • Advanced sensor technology

Background:

  • Visualizing weak near-infrared (NIR) light is crucial for applications like sensing and imaging.
  • Current methods face challenges due to inefficient detection and upconversion (UC) mechanisms.

Purpose of the Study:

  • To develop a smart NIR-to-visible photon-UC organic optoelectronic device.
  • To integrate photodetection, light-emitting diode (LED), and photovoltaic capabilities for enhanced NIR light visualization.

Main Methods:

  • Designed a ternary bulk heterojunction sensitizer doped with rubrene:DBP as the emitter.
  • Integrated photodetection, LED, and photovoltaic functions into a single device.
  • Programmed continuous photodetection monitoring with automatic LED compensation below a threshold.

Main Results:

  • Achieved high UC efficiency (>1.5%) for 808 nm to 608 nm upconversion.
  • Demonstrated excellent NIR photodetection with responsivity of 0.35 A/W and detectivity up to 10^13 Jones.
  • Exhibited low turn-on voltage (0.9 V), high luminance (>1200 cd/m^2), and >10% power conversion efficiency.

Conclusions:

  • The multifunctional device enables clear visualization of weak NIR light, even under low-light conditions.
  • High performance and self-powered operation make it suitable for sensitive detection and energy harvesting.
  • Offers significant potential for advancements in sensing, display technologies, and energy harvesting.