Unraveling the defect-induced photoluminescence of a donor-acceptor AIE luminogen

Zhang, Xunxue; Hu, Jiangting; Han, Hongliang; Li, Zhongfeng; Han, Tianyu

doi:10.1016/j.dyepig.2021.109566

Cited by 12 publications

(4 citation statements)

References 63 publications

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“…The emission enhancement would be due to the decrease of nonradiative transition. [10,16,17,[22][23][24] The overall intensity gradually decreased when the external pressure was between 0.9 GPa to 4.0 GPa. The intensity decrease would be resulted from the increase of nonradiative transition.…”

Section: Resultsmentioning

confidence: 99%

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Two different emission enhancement of trans-stilbene crystal under high pressure: Different evolution of structure

Gu¹,

Shao²,

Tian³

et al. 2022

Chinese Phys. B

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Mechanoresponsive luminescent (MRL) materials have drawn extensive concern due to their potential applications in mechanical sensors, memory chips, and security inks; especially these possessing high emission efficiency. In this work, we found trans-stilbene crystal exhibited two different pressure-induced emission enhancement (PIEE) behaviors at different pressure areas. The structural characterizations combined with density functional theory calculation indicate that the first emission enhancement was due to the decrease of nonradiation transition by the weaken of energy exchange process between atoms and lattice. And the second emission enhancement was attributed to the strengthen of C–H…C interactions from the non-planarization comformation. The results regarding the mechanoresponsive behavior of trans-stilbene offered a deep insight into PIEE from the structural point of view, which will facilitate the design of and search for high-performance MRL materials.

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Section: Resultsmentioning

confidence: 99%

“…The different molecular conformation and decreased degree of planarization would lead to the second emission enhancement. [23,24] Compressed Compressed To further verify the change of intermolecular interactions for different structure, the Hirshfeld surface was calculated. [40] Figure 5 .…”

Section: Resultsmentioning

confidence: 99%

Two different emission enhancement of trans-stilbene crystal under high pressure: Different evolution of structure

Gu¹,

Shao²,

Tian³

et al. 2022

Chinese Phys. B

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show abstract

“…This molecular design is based on the following considerations: (1) nitrogen-containing TPA may enhance electron transition to facilitate the ISC process for its excellent hole-transporting capability and its steric hindrance; 23 (2) the rigid π-conjugated structure of TA has good electron withdrawing capability and can promote the formation of H-aggregation with a large transition dipole moment, which can effectively protect and stabilize the triplet excitons. 19,27 The photoluminescence of TPATA in solution display a substantial redshift with the increase of solvent polarity, resulting in a full-color emission coverage from blue (443 nm in CCl 4 ) to orange red (621 nm in DMSO). In the meantime, it displays conventional fluorescence and RTP phenomena in both crystals and polymeric films.…”

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confidence: 99%

“…(1) nitrogen-containing TPA may enhance electron transition to facilitate the ISC process for its excellent hole-transporting capability and its steric hindrance; 23 (2) the rigid p-conjugated structure of TA has good electron withdrawing capability and can promote the formation of H-aggregation with a large transition dipole moment, which can effectively protect and stabilize the triplet excitons. 19,27 The photoluminescence of TPATA in solution Scheme 1 Synthetic route for TPATA.…”

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confidence: 99%