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Photoluminescence: Fluorescence and Phosphorescence01:23

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Related Experiment Video

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Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
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Fast responsive and highly efficient optical upconverter based on phosphorescent OLED.

Xinbo Chu1, Min Guan, Litao Niu

  • 1Key Laboratory of Semiconductor Materials Science, Institute of semiconductors, Chinese Academy of Sciences , Beijing, China.

ACS Applied Materials & Interfaces
|October 14, 2014
PubMed
Summary

Researchers developed a novel hybrid optical upconverter using phosphorescent organic light-emitting diodes (OLEDs). This device efficiently converts infrared light to green light, showing promise for high-speed infrared imaging applications.

Keywords:
42.79.Pw85.60.Bt85.60.JbOLEDfast responseinfrared photo detectoroptical upconverterorganic−inorganic hybrid devicephosphorescent

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Photonics

Background:

  • Organic-inorganic hybrid materials offer unique optoelectronic properties.
  • Organic light-emitting diodes (OLEDs) are crucial for display technologies.
  • Optical upconversion enables the conversion of lower-energy photons to higher-energy ones.

Purpose of the Study:

  • To fabricate and investigate a hybrid optical upconverter sensitive to 980 nm infrared (IR) light.
  • To compare the efficiency of phosphorescent OLED-based upconverters with fluorescent ones.
  • To analyze the transient optical and electrical response of the upconverter.

Main Methods:

  • Fabrication of an organic-inorganic hybrid optical upconverter utilizing a phosphorescent OLED unit.
  • Doping of 4,4'-bis(N-carbazolyl)-1,1'-biphenyl (CBP) with fac-Tris(2-phenylpyridine) iridium (Ir(ppy)3) for the emitting layer.
  • Measurement of upconversion efficiency and transient response under varying IR intensity and applied voltage.

Main Results:

  • The phosphorescent OLED-based upconverter achieved a 4.8% upconversion efficiency at 15 V, significantly higher than the 2.0% of the fluorescent device.
  • The upconverter demonstrated a rapid response time as short as 60 μs.
  • Transient response was found to be dependent on IR intensity and applied voltage.

Conclusions:

  • The developed hybrid optical upconverter exhibits superior efficiency compared to fluorescent counterparts.
  • The rapid response time of the upconverter makes it suitable for high-speed infrared imaging.
  • This technology presents a promising advancement in optical upconversion devices.