Exploiting racemism enhanced organic room-temperature phosphorescence to demonstrate Wallach’s rule in the lighting chiral chromophores

Xiugang Wu, Chun-Ying Huang, Deng-Gao Chen, Denghui Liu, Chichi Wu, Keh-Jiunh Chou, Bin Zhang, Yafei Wang, Yu Liu, Elise Y. Li, Weiguo Zhu () and Pi-Tai Chou ()
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Xiugang Wu: Changzhou University
Chun-Ying Huang: National Taiwan University
Deng-Gao Chen: National Taiwan University
Denghui Liu: Changzhou University
Chichi Wu: National Normal Taiwan University
Keh-Jiunh Chou: National Taiwan University
Bin Zhang: Changzhou University
Yafei Wang: Changzhou University
Yu Liu: Changzhou University
Elise Y. Li: National Normal Taiwan University
Weiguo Zhu: Changzhou University
Pi-Tai Chou: National Taiwan University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract The correlation between molecular packing structure and its room-temperature phosphorescence (RTP), hence rational promotion of the intensity, remains unclear. We herein present racemism enhanced RTP chiral chromophores by 2,2-bis-(diphenylphosphino)-1,1-napthalene (rac-BINAP) in comparison to its chiral counterparts. The result shows that rac-BINAP in crystal with denser density, consistent with a long standing Wallach’s rule, exhibits deeper red RTP at 680 nm than that of the chiral counterparts. The cross packing between alternative R- and S- forms in rac-BINAP crystal significantly retards the bimolecular quenching pathway, triplet-triplet annihilation (TTA), and hence suppresses the non-radiative pathway, boosting the RTP intensity. The result extends the Wallach’s rule to the fundamental difference in chiral-photophysics. In electroluminescence, rac-BINAP exhibits more balanced fluorescence versus phosphorescence intensity by comparison with that of photoluminescence, rendering a white-light emission. The result paves an avenue en route for white-light organic light emitting diodes via full exploitation of intrinsic fluorescence and phosphorescence.

Date: 2020
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DOI: 10.1038/s41467-020-15976-5

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