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Related Concept Videos

Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Electroluminescent devices with function of electro-optic shutter.

Seongkyu Song1, Jaewook Jeong, Seok Hwan Chung

  • 1Division of Nano & Bio Technology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Korea.

Optics Express
|October 6, 2012
PubMed
Summary
This summary is machine-generated.

Polymer-dispersed liquid crystal (PDLC) integrated into electroluminescent (EL) devices enhances luminescence extraction by over 14%. This novel dielectric layer enables multi-functional transparent displays with privacy window capabilities.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Polymer Science

Background:

  • Polymer-dispersed liquid crystals (PDLCs) are known for their electro-optic properties.
  • Electroluminescent (EL) devices require efficient dielectric layers for optimal performance.
  • Integrating multiple functionalities into a single device is a key goal in display technology.

Purpose of the Study:

  • To investigate the use of a PDLC layer as a dielectric in an EL device.
  • To evaluate the impact of the PDLC layer on electroluminescence and electro-optic shutter functionalities.
  • To assess the performance and potential applications of this multi-functional device.

Main Methods:

  • A 50 μm-thick PDLC layer was fabricated and incorporated between a transparent electrode and a ZnS:Cu phosphor layer in an EL device.
  • The electro-optic properties of the EL device with the PDLC layer were characterized.
  • Luminescence extraction efficiency and PDLC transmittance under varying excitation frequencies were measured.

Main Results:

  • The introduction of the PDLC layer did not distort the electro-optic properties of the EL device.
  • Luminescence extraction efficiency was improved by more than 14% due to the PDLC layer.
  • PDLC transmittance remained largely unaffected by excitation frequency, allowing EL ignition at a given voltage for full transparency.

Conclusions:

  • PDLCs can be effectively utilized as dielectric layers in EL devices, enhancing luminescence.
  • The developed device offers combined electroluminescence and electro-optic shutter functions, suitable for transparent displays.
  • This technology holds significant potential for applications such as privacy windows in transparent displays.