Organic emitter integrating aggregation-induced delayed fluorescence and room-temperature phosphorescence characteristics, and its application in time-resolved luminescence imaging†,Chemical Science

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Organic emitter integrating aggregation-induced delayed fluorescence and room-temperature phosphorescence characteristics, and its application in time-resolved luminescence imaging†
Chemical Science ( IF 7.6 ) Pub Date : 2018-06-28 00:00:00 , DOI: 10.1039/c8sc01485j
Fan Ni _{1,

2,

3,

4,

5} , Zece Zhu _{1,

2,

3,

4,

5} , Xiao Tong _{5,

6,

7,

8,

9} , Mingjuan Xie _{5,

6,

7,

8,

9} , Qiang Zhao _{5,

6,

7,

8,

9} , Cheng Zhong _{1,

2,

3,

4,

5} , Yang Zou _{5,

10,

11,

12,

13} , Chuluo Yang _{1,

2,

3,

4,

5}

Affiliation

Thermally activated delayed fluorescence (TADF) with a substantially long lifetime furnishes a new paradigm in developing probes for time-resolved imaging. Herein, a novel TADF fluorophore, namely, PXZT, with terpyridine as the acceptor and phenoxazine (PXZ) as the donor, was rationally designed and synthesized. The new compound shows typical thermally activated delayed fluorescence, aggregation-induced emission and crystallization-induced room-temperature phosphorescence (RTP). The coordination of PXZT with a zinc ion causes the quenching of the fluorescence of PXZT due to the enhanced intramolecular charge transfer of the resulting complex ZnPXZT1. With the dissociation of the ZnPXZT1 to release PXZT and the subsequent in situ hydrophobic aggregation of the free PXZT to resist the influence of oxygen, the TADF emission of PXZT is recovered. This zinc-assisted process is successfully used for time-resolved imaging of HeLa and 3T3 cells. This work presents a simple and effective strategy for time-resolved imaging by in situ forming TADF aggregates to turn on the TADF emission.

中文翻译：

集成了聚集体诱导的延迟荧光和室温磷光特性的有机发射体及其在时间分辨发光成像中的应用†

具有较长使用寿命的热活化延迟荧光（TADF）为开发用于时间分辨成像的探针提供了新的范例。在此，合理设计合成了一种新型的TADF荧光团，即PXZT，以吡啶为受体，以苯恶嗪（PXZ）为供体。新化合物显示出典型的热激活延迟荧光，聚集诱导的发射和结晶诱导的室温磷光（RTP）。的协调PXZT用锌离子引起的荧光的淬灭PXZT由于得到的复合物的增强的分子内电荷转移ZnPXZT1。随着ZnPXZT1的解离而释放PXZT和随后的原位的游离的疏水聚合PXZT抵抗氧的影响，的TADF发射PXZT被回收。这种锌辅助过程已成功用于HeLa和3T3细胞的时间分辨成像。这项工作通过原位形成TADF聚集体以开启TADF发射，提出了一种简单有效的时间分辨成像策略。

更新日期：2018-06-28

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