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Dynamically doped white light emitting tandem devices.

Takeo Akatsuka1, Cristina Roldán-Carmona, Enrique Ortí

  • 1Instituto de Ciencia Molecular, Universidad de Valencia, C/Catedrático J. Beltrán 2, 46980, Paterna (Valencia), Spain; Nippon Shokubai Co., Ltd. 5-8 Nishi Otabi-cho, Suita, 564-8512, Osaka, Japan.

Advanced Materials (Deerfield Beach, Fla.)
|October 30, 2013
PubMed
Summary

Solution-processed, salt-containing layers for blue and orange light emission enable efficient white light-emitting devices. A tandem configuration with a thin metal layer enhances device performance.

Keywords:
electroluminescent deviceslight-emitting electrochemical cellstandem LECswhite light

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photonics

Background:

  • Development of efficient white light-emitting devices is crucial for solid-state lighting and displays.
  • Tandem device architectures offer a pathway to enhance efficiency and color tuning in organic light-emitting diodes (OLEDs).

Purpose of the Study:

  • To investigate the performance of solution-processed, salt-containing emissive layers in a tandem device configuration for white light emission.
  • To explore the role of a thin metal interlayer in optimizing charge transport and recombination in the tandem structure.

Main Methods:

  • Fabrication of tandem devices utilizing solution-processed, salt-containing blue and orange light-emitting layers.
  • Incorporation of a thin metal layer as a charge generation/transport interlayer between the emissive units.
  • Characterization of the optoelectronic properties, including electroluminescence spectra, current-voltage characteristics, and external quantum efficiency.

Main Results:

  • Efficient white light emission was achieved by combining blue and orange emissive layers in a tandem OLED.
  • The solution-processed, salt-containing layers demonstrated good film-forming properties and high luminescence efficiency.
  • The thin metal interlayer effectively facilitated charge generation and balanced charge injection, leading to high device efficiency.

Conclusions:

  • Solution-processed, salt-containing materials are viable for efficient white OLEDs.
  • Tandem device architecture with a metal interlayer is a promising strategy for high-performance white lighting applications.
  • This approach offers a cost-effective and scalable method for fabricating efficient white light-emitting devices.