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Room Temperature Phosphorescence from a Benzothiophene-based N-B-N Multi-Resonance Core

08 December 2025, Version 1
Working Paper
This content is an early or alternative research output and has not been peer-reviewed by Cambridge University Press at the time of posting.

Abstract

We report a design strategy that enables room temperature phosphorescence from an N-B-N type heterocycle, reminiscent of a multi-resonance thermally activated delayed fluorescence (MR-TADF) compound, by disturbing the alternating frontier molecular orbital distribution pattern through five-membered ring fusion with the boron atom. The 2 wt% doped film in mCP host showed a long phosphorescence lifetime of 51.5 ms at 571 nm at room temperature, with an afterglow visible for up to 1 s.

Keywords

Room temperature phosphorescence
metal-free emitters
benzothiophene
triplet excitons

Supplementary materials

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Version History

Dec 08, 2025 Version 1

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The content is available under CC BY 4.0 [opens in a new tab]

DOI

10.26434/chemrxiv-2025-n0l7j
D O I: 10.26434/chemrxiv-2025-n0l7j [opens in a new tab]

Funding

Leverhulme Trust
RPG-2022-032
Engineering and Physical Sciences Research Council
EP/R035164/1
Engineering and Physical Sciences Research Council
EP/W007517/1
Engineering and Physical Sciences Research Council
EP/Z535291/1

Author’s competing interest statement

The author(s) have declared they have no conflict of interest with regard to this content

Ethics

The author(s) have declared ethics committee/IRB approval is not relevant to this content

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