A phenylbenzoxazole-based organic compound, N-(3-(benzo[d]oxazol-2-yl)phenyl)-4-tert-butylbenzamide (3OTB), has been synthesized, and the mechanism of its condensed-state emission enhancement has been studied. Experimental and theoretical investigations indicate that prohibition of transition from the local excited state to the nonemissive twisted intramolecular charge transfer (TICT) excited state, but halfway to the intermediate emissive quasi-TICT excited state that results from partial restriction of free intramolecular rotations in condensed states, is responsible for the emission enhancement. Furthermore, it is easy to grow 3OTB nanosheets from THF/H₂O mixed solvents. In addition, when the molecular arrangement is more ordered, restriction of molecular rotation becomes severer, and consequently, stronger emission can be observed, so that the emission quantum efficiency is in the order of crystalline > powder > nanosheet > amorphous film.

中文翻译：

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从黑暗的TICT状态到发射准TICT状态：N-（3-（苯并[ d ]恶唑-2-基）苯基）-4-叔丁基苯甲酰胺的AIE机理

合成了苯基苯并恶唑基有机化合物N-（3-（苯并[ d ]恶唑-2-基）苯基）-4-叔丁基苯甲酰胺（3OTB），其缩合态发射增强机理经过研究。实验和理论研究表明，禁止从局部激发态过渡到非发射扭曲分子内电荷转移（TICT）激发态，但过渡到中间发射准-TICT激发态的中途，这是由于在凝聚态下分子内自由旋转受到部分限制，负责排放量的增加。此外，很容易从THF / H _2中生长3OTB纳米片O混合溶剂。另外，当分子排列更加有序时，分子旋转的限制变得更严格，因此，可以观察到更强的发射，使得发射量子效率的顺序为晶体>粉末>纳米片>非晶膜。