Ultralong Phosphorescence from Organic Ionic Crystals under Ambient Conditions |
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| Authors: | Zhichao Cheng Dr Huifang Shi Dr Huili Ma Lifang Bian Qi Wu Long Gu Suzhi Cai Xuan Wang Prof Wei‐wei Xiong Prof Zhongfu An Prof Wei Huang |
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| Affiliation: | 1. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, China;2. Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), Xi'an, China |
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| Abstract: | A new type of materials, organic salts in the crystal state, have ultralong organic phosphorescence (UOP) under ambient conditions. The change of cations (NH4+, Na+, or K+) in these phosphors gives access to tunable UOP colors ranging from sky blue to yellow green, along with ultralong emission lifetimes of over 504 ms. Single‐crystal analysis reveals that unique ionic bonding can promote an ordered arrangement of organic salts in crystal state, which then can facilitate molecular aggregation for UOP generation. Additionally, reversible ultralong phosphorescence can be realized through the alternative employment of fuming gases (ammonia and hydrogen chloride), demonstrating its potential as a candidate for visual ammonic or hydrogen chloride gas sensing. The results provide an environmental responsible and practicable synthetic approach to expanding the scope of ultralong organic phosphorescent materials as well as their applications. |
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| Keywords: | crystal engineering gas sensing organic ionic crystals ultralong phosphorescence |
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