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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Related Experiment Video

Updated: Jun 12, 2026

Triplet Fusion Upconversion Nanocapsule Synthesis
08:36

Triplet Fusion Upconversion Nanocapsule Synthesis

Published on: September 7, 2022

High-Performance Organic Upconversion Devices Based on Exciplex Emitters for Near-Infrared Visualization in

Peixian Lei1, Jinglong Chen1, Zeyu He1,2

  • 1School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.

ACS Applied Materials & Interfaces
|June 11, 2026
PubMed
Summary
This summary is machine-generated.

Organic upconversion devices (OUPCs) achieve low-voltage operation and compositional tolerance using a novel three-channel exciplex emitter. This breakthrough enables efficient near-infrared (NIR) to visible light conversion for advanced visualization and detection applications.

Keywords:
biological imagingexciplex emitternear-infrared visualizationoptical securityorganic upconversion devices

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Published on: August 22, 2019

Area of Science:

  • Organic electronics
  • Photonics
  • Materials science

Background:

  • Organic upconversion devices (OUPCs) convert near-infrared (NIR) photons to visible light, crucial for NIR visualization and detection.
  • Existing OUPCs face challenges with high turn-on voltages and sensitivity to emitter composition, limiting practical use.
  • Heavy-metal-free emitters are sought after for sustainable and efficient optoelectronic devices.

Purpose of the Study:

  • To develop a novel exciplex emitter architecture for low-voltage, compositionally tolerant OUPCs.
  • To enhance NIR to visible light conversion efficiency and device performance.
  • To demonstrate the potential of these OUPCs in applications like encrypted image decryption and bioimaging.

Main Methods:

  • Design and fabrication of a three-channel exciplex emitter architecture.
  • Synergistic multichannel energy transfer and reverse intersystem crossing within the exciplex system.
  • Characterization of OUPC performance, including turn-on voltage, external quantum efficiency, luminance on:off ratio, and detectivity.

Main Results:

  • The exciplex emitter achieved a low turn-on voltage of 2.3 V and a maximum external quantum efficiency of 18%.
  • The resulting OUPC demonstrated an ultralow upconversion turn-on voltage of 1.6 V, high luminance on:off ratio (>3.1 × 10^6), and detectivity (>1.5 × 10^13 Jones).
  • Nearly invariant emission performance across a wide D:A ratio range (DBT-SADF:PO-T2T from 2:8 to 8:2) highlights processing tolerance.

Conclusions:

  • The three-channel exciplex emitter strategy enables low-voltage, compositionally tolerant OUPCs without heavy metals.
  • The developed OUPC exhibits superior performance, suitable for sensitive NIR detection and visualization.
  • This approach offers a scalable pathway for advanced NIR information visualization, encrypted image decryption, and bioimaging.