Deciphering the environment-dependent multicolor emission mechanism of phosphine amine PBT.

Authors

Siqi Wang, Hongyan Mu, Xinlin Yang, Jialin Liang, Yifu Zhang, Hui Li, Xin Bao

Published in

Optics letters. Volume 51. Issue 17. Pages 4944-4947. Sep 01, 2026.

Abstract

Single-component multicolor luminescence is vital for advanced optical materials, yet its mechanism remains challenging to rationalize due to multiple environmentally regulated excited-state processes. In this Letter, the multicolor emission mechanism of PBT was elucidated using photophysical measurements and quantum chemical calculations. Specifically, in the solid state, intersystem crossing from S₁ and S₂ states to adjacent triplet states enables dual emission, with fluorescence and room-temperature phosphorescence together nearly spanning the visible region and showing clear excitation-wavelength dependence. In low-polarity solvents, phosphorescence is weakened, whereas in polar solvents it is suppressed and fluorescence dominates. We further demonstrate that excited-state intramolecular proton transfer is accessible in both the solid state and solution but does not directly contribute to emission. Twisted intramolecular charge transfer is also inhibited in solution by a high twisting barrier. This work clarifies the excited-state origin of PBT emission and guides the design of single-component multicolor and white-light emitters.

PMID:
42679286
Bibliographic data and abstract were imported from PubMed on 02 Sep 2026.

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