Advanced Photonics Research (May 2023)

Broadband White‐Light‐Emitting Electrochemical Cells

  • Brando Adranno,
  • Shi Tang,
  • Veronica Paterlini,
  • Volodymyr Smetana,
  • Olivier Renier,
  • Guillaume Bousrez,
  • Ludvig Edman,
  • Anja-Verena Mudring

DOI
https://doi.org/10.1002/adpr.202200351
Journal volume & issue
Vol. 4, no. 5
pp. n/a – n/a

Abstract

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Emerging organic light‐emitting devices, such as light‐emitting electrochemical cells (LECs), offer a multitude of advantages but currently suffer from that most efficient phosphorescent emitters are based on expensive and rare metals. Herein, it is demonstrated that a rare metal‐free salt, bis(benzyltriphenylphosphonium)tetrabromidomanganate(II) ([Ph3PBn]2[MnBr4]), can function as the phosphorescent emitter in an LEC, and that a careful device design results in the fact that such a rare metal‐free phosphorescent LEC delivers broadband white emission with a high color rendering index (CRI) of 89. It is further shown that broadband emission is effectuated by an electric‐field‐driven structural transformation of the original green‐light emitter structure into a red‐emitting structure.

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