高效的近红外发光激素,其发射峰值超过750nm
Chunxiao Wu1, Chen Lu1, Shilong Yu1
1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Qianjin Avenue 2699, Changchun, 130012, P. R. China.
Angewandte Chemie (International ed. in English)
|September 1, 2024
概括
我们开发了用于近红外 (NIR) 辐射的新型有机分子,在750nm以上实现了高光发光量子效率 (PLQE). 这些无金属发射器为生物和光电子应用提供了卓越的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 有机化学 有机化学
- 光物理学的光学物理学
背景情况:
- 纯有机分子用于近红外 (NIR) 辐射,由于其优势,它们对生物和光电子应用具有价值.
- 对于有机NIR发射器,其发射峰值>750nm,实现高光发光量子效率 (PLQE) 是具有挑战性的,因为能量差距定律.
研究的目的:
- 为高效的NIR发射设计和合成新的开有机基辐射器.
- 研究无金属有机NIR发射器中高PLQE的结构-属性关系.
主要方法:
- 合成了两个捐赠-接受型基因发射剂:DMNA-Cz-BTM和DMNA-PyID-BTM.
- 描述它们的光物理性质,包括辐射光谱和PLQE.
- 对激发状态特性和振动模式的分析,以了解非辐射衰变路径.
主要成果:
- DMNA-Cz-BTM在758nm发射,PLQE为55%;DMNA-PyID-BTM在778nm发射,PLQE为66% .
- 捐赠者-接受者结构促进充电转移激发状态,具有空间分离的,不结合的电子和孔水平.
- 抑制高频和低频振动有效地减少了非辐射衰变.
结论:
- 设计的激素发射器实现了无金属有机NIR发射器 (>750nm) 的创纪录的高PLQE.
- 战略分子设计克服了能源差距法对高效NIR发射的限制.
- 这些分子对先进的生物成像和光电子设备具有重大前景.
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