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Bulk Heterojunction Upconversion Thin Films Fabricated via One-Step Solution Deposition.

Manchen Hu1, Emma Belliveau1, Yilei Wu2

  • 1Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States.

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|November 14, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method for solid-state upconversion, converting near-infrared light to visible light. This bulk heterojunction film, made with organic semiconductors, offers high efficiency and simple, single-step processing for advanced optical applications.

Keywords:
Bulk heterojunctionFlexible substratesRubreneSingle-Step DepositionThin filmsUpconversion

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Organic Electronics

Background:

  • Solid-state upconversion, converting lower-energy near-infrared light to higher-energy visible light, is crucial for many applications.
  • Existing methods for triplet-triplet annihilation upconversion often struggle with low external quantum efficiency (EQE) in solid-state films.
  • Recent advances utilize charge-transfer state sensitization to broaden material options for upconversion.

Purpose of the Study:

  • To develop a facile and efficient method for creating solid-state upconversion films.
  • To investigate the use of organic semiconductors in a bulk heterojunction architecture for upconversion.
  • To demonstrate the potential of this system for practical solid-state upconversion applications.

Main Methods:

  • Fabrication of a bulk heterojunction thin film using organic semiconductors via a single-step solution-processed deposition.
  • Utilizing an interface-triplet-generation mechanism facilitated by the high contact area in the bulk heterojunction.
  • Demonstrating various deposition and patterning techniques on diverse substrates.

Main Results:

  • Successful creation of a bulk heterojunction upconversion film through a single-step solution process.
  • The bulk heterojunction structure enhances the contact between sensitizer and annihilator, crucial for the triplet-triplet annihilation mechanism.
  • The developed film can be deposited and patterned using multiple methods, indicating versatility.

Conclusions:

  • Single-step solution processing of bulk heterojunction organic semiconductor films offers a promising route to efficient solid-state upconversion.
  • This approach overcomes limitations of previous methods, enabling high EQE in practical devices.
  • The demonstrated deposition and patterning flexibility highlights the system's potential for widespread use in solid-state upconversion applications.