Realizing Near-Infrared Laser Dyes through a Shift in Excited-State Absorption

Reiko Aoki, Ryutaro Komatsu, Kenichi Goushi, Masashi Mamada, Soo Young Ko, Jeong Weon Wu, Virginie Placide, Anthony D'Aléo, Chihaya Adachi

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The development of near-infrared (NIR) light sources has attracted much interest due to their attractive applications, such as biosensing and light detection and ranging (LiDAR). In particular, organic semiconductor laser diodes with NIR emission are emerging as a next generation technology. However, organic NIR emitters have generally suffered from a low quantum yield, which has resulted in only a few examples of organic solid-state NIR lasers. In this study, the authors demonstrate a highly efficient NIR emitter based on a boron difluoride curcuminoid structure, which shows a high photoluminescence (PL) quantum yield (ΦPL) at >700 nm and a high fluorescence radiative rate constant in a solid-state film. Amplified spontaneous emission and lasing occurs at >800 nm with very low thresholds. The large redshift of the stimulated emission is attributed to the transition from the lowest excited state to the different vibrational levels of the ground state owing to the overlap between the emission and the singlet–singlet excited-state absorption.

Original languageEnglish
Article number2001947
JournalAdvanced Optical Materials
Issue number6
StatePublished - 18 Mar 2021

Bibliographical note

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© 2021 Wiley-VCH GmbH


  • amplified spontaneous emission
  • distributed feedback laser
  • organic light-emitting diodes
  • organic semiconductor laser diodes
  • thermally activated delayed fluorescence


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