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Screening Fluorination Additives for Efficient Perovskite Light-Emitting Diodes.

Yu Xia1, Chen Zou2, Yan-Hui Lou3

  • 1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China.

Advanced Materials (Deerfield Beach, Fla.)
|November 22, 2024
PubMed
Summary

Fully fluorinated additives effectively suppress domain polydispersity in quasi-2D perovskites, enhancing energy transfer. This discovery offers a new screening criterion for developing efficient perovskite light-emitting diodes (PeLEDs).

Keywords:
blue emissiondipole momentdomain distribution managementfluorinated additiveslight‐emitting diodes

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Chemistry

Background:

  • Domain polydispersity in quasi-2D perovskites hinders performance.
  • Current screening methods for fluorinated additives are inefficient and costly.

Purpose of the Study:

  • To investigate the impact of fluorination degree in additives on domain distribution in quasi-2D perovskites.
  • To establish screening criteria for selecting effective fluorinated additives.

Main Methods:

  • Systematic exploration of various fluorinated additives.
  • Analysis of domain distribution and optical properties.
  • Fabrication and characterization of perovskite light-emitting diodes (PeLEDs).

Main Results:

  • Fully fluorinated additives effectively suppress low-dimensional domains and improve energy transfer.
  • Partially fluorinated additives lead to degraded optical properties.
  • Molecular dipole moment of additives explains the observed trends.

Conclusions:

  • The degree of fluorination in additives is critical for controlling domain distribution.
  • A screening criterion based on fluorination and molecular dipole moment is proposed.
  • Fully fluorinated additives enable high-efficiency sky-blue PeLEDs with a peak EQE of 20.38%.