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Related Concept Videos

IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
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Updated: Jul 16, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Published on: March 22, 2019

Resonant Cavity-Enhanced Intermolecular Charge-Transfer Absorption for Near-Infrared Photon Upconversion and

Shou-Jie He1, Xin-Ya Yan1, Jia-Xiu Man2

  • 1Center For Optoelectronics Engineering Research, School of Physics and Astronomy, Yunnan University, Kunming, China.

Advanced Materials (Deerfield Beach, Fla.)
|July 15, 2026
PubMed
Summary

Researchers developed an organic upconversion device (OUD) using charge-transfer absorption to convert near-infrared (NIR) light to visible light. This breakthrough enables efficient NIR sensing and imaging without specialized materials.

Keywords:
charge‐transfer absorptioninfrared imagingorganic upconversion devicephotodetectorresonant cavity

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Area of Science:

  • Organic electronics
  • Photonics
  • Materials Science

Background:

  • Organic semiconductors are promising for optoelectronics but have limited near-infrared (NIR) absorption.
  • Existing technologies struggle with efficient NIR to visible light conversion for sensing and imaging.

Purpose of the Study:

  • To develop an organic upconversion device (OUD) for efficient NIR radiation conversion into visible light.
  • To overcome the spectral limitations of organic semiconductors in the NIR range.
  • To demonstrate novel NIR sensing, upconversion, and imaging capabilities.

Main Methods:

  • Engineered a resonant optical microcavity to amplify charge-transfer (CT) absorption.
  • Integrated an organic photodetector (PD) and organic light-emitting diode (OLED) with optical isolation.
  • Fabricated devices with adjustable cavity thickness for different NIR wavelengths and dot-matrix connecting electrodes (DMCEs) for large-area imaging.

Main Results:

  • Achieved a power-to-power conversion efficiency of 16.9% for NIR (980 nm) to visible light conversion.
  • Demonstrated the first efficient OUD operating at 1550 nm by tuning the microcavity.
  • Successfully performed single-detector NIR imaging using large-area devices with DMCEs, eliminating the need for complex readout integrated circuits (ROICs).

Conclusions:

  • Intermolecular charge-transfer (CT) absorption is a versatile platform for NIR photonic applications.
  • The developed OUD overcomes intrinsic material limitations for efficient NIR light conversion.
  • This technology opens new avenues for NIR sensing, upconversion, and imaging applications.