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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Difluoroboron-Enabled Thermally Activated Delayed Fluorescence.

Guijie Li1, Weiwei Lou1, Dan Wang2

  • 1State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering , Zhejiang University of Technology , Hangzhou 310014 , P. R. China.

ACS Applied Materials & Interfaces
|August 8, 2019
PubMed
Summary
This summary is machine-generated.

New boron-based materials enable efficient and stable organic light-emitting diodes (OLEDs). These thermally activated delayed fluorescence (TADF) materials achieve high performance and long operational lifetimes for advanced display technologies.

Keywords:
blue OLEDdihedral angleorganic light-emitting diodetetracoordinated difluoroboron compoundthermally activated delayed fluorescence

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Organic light-emitting diodes (OLEDs) are crucial for modern displays.
  • Thermally activated delayed fluorescence (TADF) materials offer high efficiency but require stable frameworks.
  • Developing novel TADF emitters with improved performance and air stability is an ongoing challenge.

Purpose of the Study:

  • To design and synthesize novel tetracoordinated boron-enabled TADF materials.
  • To investigate the role of difluoroboron in achieving TADF properties.
  • To evaluate the performance of these materials in OLED devices.

Main Methods:

  • Synthesis of donor-acceptor type BF2-based TADF materials.
  • Coordination of difluoroboron with a 2-(4-phenylpyridin-2-yl)phenol (PPyPOH) moiety.
  • Fabrication and characterization of OLED devices doped with the synthesized materials.

Main Results:

  • High photoluminescence quantum yield (PLQY) up to 99% achieved.
  • Efficient blue OLEDs demonstrated external quantum efficiencies (EQEs) of 11.0% and 15.8%.
  • Achieved high brightness and operational lifetimes (LT50) of 54 h for blue and 920 h for green OLEDs.

Conclusions:

  • Tetracoordinated difluoroboron molecules are effective building blocks for stable and efficient TADF emitters.
  • The developed materials show significant promise for practical OLED applications.
  • This work provides a new strategy for designing high-performance TADF materials.