Boosting organic phosphorescence in adaptive host-guest materials by hyperconjugation

Huili Ma, Lishun Fu, Xiaokang Yao, Xueyan Jiang, Kaiqi Lv, Qian Ma, Huifang Shi, Zhongfu An () and Wei Huang ()
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Huili Ma: Nanjing Tech University
Lishun Fu: Nanjing Tech University
Xiaokang Yao: Nanjing Tech University
Xueyan Jiang: Nanjing Tech University
Kaiqi Lv: Nanjing Tech University
Qian Ma: Nanjing Tech University
Huifang Shi: Nanjing Tech University
Zhongfu An: Nanjing Tech University
Wei Huang: Nanjing Tech University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Phosphorescence is ubiquitous in heavy atom-containing organic phosphors, which attracts considerable attention in optoelectronics and bioelectronics. However, heavy atom-free organic materials with efficient phosphorescence are rare under ambient conditions. Herein, we report a series of adaptive host-guest materials derived from dibenzo-heterocyclic analogues, showing host-dependent color-tunable phosphorescence with phosphorescence efficiency of up to 98.9%. The adaptive structural deformation of the guests arises from the hyperconjugation, namely the n→π* interaction, enabling them to inhabit the cavity of host crystals in synergy with steric effects. Consequently, a perfect conformation match between host and guest molecules facilitates the suppression of triplet exciton dissipation, thereby boosting the phosphorescence of these adaptive materials. Moreover, we extend this strategy to a ternary host-guest system, yielding both excitation- and time-dependent phosphorescence with a phosphorescence efficiency of 92.0%. This principle provides a concise way for obtaining efficient and color-tunable phosphorescence, making a major step toward potential applications in optoelectronics.

Date: 2024
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DOI: 10.1038/s41467-024-47992-0

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