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. 2023 Feb 17;14(10):2640-2645.
doi: 10.1039/d3sc00172e. eCollection 2023 Mar 8.

Pressure-induced room-temperature phosphorescence enhancement based on purely organic molecules with a folded geometry

Zhiqiang Yang  1 , Zhiyuan Fu  2 , Haichao Liu  1 , Min Wu  2 , Nan Li  2 , Kai Wang  2 , Shi-Tong Zhang  1 , Bo Zou  2 , Bing Yang  1
Affiliations

Pressure-induced room-temperature phosphorescence enhancement based on purely organic molecules with a folded geometry

Zhiqiang Yang et al. Chem Sci. .

Abstract

The pressure-dependent luminescence behavior of purely organic compounds is an important topic in the field of stimulus-responsive smart materials. However, the relevant studies are mainly limited to the investigation of fluorescence properties, while room-temperature phosphorescence (RTP) of purely organic compounds has not been investigated. Here, we filled in this gap regarding pressure-dependent RTP by using a model molecule selenanthrene (SeAN) with a folded geometry. For the first time to the best of our knowledge, a unique phenomenon involving pressure-induced RTP enhancement was discovered in an SeAN crystal, and an underlying mechanism involving folding-induced spin-orbit coupling enhancement was revealed. Pressure-induced RTP enhancement was also observed in an analog of SeAN also showing a folded geometry, but in this case yielded a white-light emission that is very rare in purely organic RTP-displaying materials.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. (a) Molecular structures of TA and SeAN. (b) Molecular configuration and packing characteristics in crystals. (c) Emission properties of TA and SeAN single crystals under ambient conditions.
Fig. 2
Fig. 2. (a) Emission spectra, (b) CIE coordinates, and (c) luminescence photographs of a SeAN single crystal under different pressures.
Fig. 3
Fig. 3. (a) ADXRD patterns, (b) compression ratios of each crystal axis obtained using Pawley refinement, and (c) extents of folding of SeAN in its crystal under different pressures. (d) S1–T1 SOC coefficients of an SeAN monomer under different pressures. (e) Schematic illustration of the pressure-induced enhancement of the RTP of the SeAN crystal.
Fig. 4
Fig. 4. (a) Emission spectra, (b) CIE coordinates, and (c) luminescence photographs of TA powder crystals under different pressures.
See this image and copyright information in PMC

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