A spin−orbit charge-transfer intersystem crossing (SOCT-ISC) type photosensitizer coumarin-BODIPY (CM-BDP) was reported in this paper. Due its aggregation induced emission (AIE) effect, CM-BDP could work under high water content condition. Besides that, another important phenomenon was discovered. In DMSO solvent, the fluorescence emission and the singlet oxygen yield of CM-BDP were almost negligible, while, in 90% water content system, the singlet oxygen yield of CM-BDP was up to 20.9% and a strong TICT fluorescence emission at 648 nm was observed, which indicated the AIE effect could also promote the generation of singlet oxygen by preserving the energy. In terms of the mechanism of generating singlet oxygen, the D-A configuration of CM-BDP could facilitate the process of charge separation, as well as the generation of TICT state. Then, the orthogonal configuration of CM-BDP in TICT state and the small _△E_st between the TICT state and T₂ state could promote the SOCT-ISC process effectively. Combining the femtosecond transient absorption spectra and the DFT theoretical calculations, the photophysical process of CM-BDP was proposed in simplified Jablonski diagram. Moreover, the CM-BDP was also applied to intracellular experiment and zebrafish imaging. In the photo/dark toxicity experiment, cell survival rate of dark toxicity experiment was basically higher than 90%, while its decreased significantly under irradiation. The result of acridine orange/ethidium bromide (AO/EB) stain experiment indicated that the CM-BDP could kill A-549 cancer cells effectively under irradiation and the fluorescence imaging in zebrafish proved that CM-BDP could be further applied in organisms.

本文报道了一种自旋轨道电荷转移系统间交叉（SOCT-ISC）型光敏剂香豆素-BODIPY（CM-BDP）。由于其聚集诱导发射（AIE）效应，CM-BDP可以在高含水量条件下工作。除此之外，还发现了另一个重要的现象。在DMSO溶剂中，CM-BDP的荧光发射和单线态氧产率几乎可以忽略不计，而在含水量为90%的体系中，CM-BDP的单线态氧产率高达20.9%，在648℃有很强的TICT荧光发射。观察到 nm，这表明 AIE 效应还可以通过保留能量来促进单线态氧的产生。在产生单线态氧的机制方面，CM-BDP 的 DA 构型可以促进电荷分离过程以及 TICT 态的产生。然后，_△ TICT态和T ₂态之间的E _st可以有效地促进SOCT-ISC过程。结合飞秒瞬态吸收光谱和DFT理论计算，在简化的Jablonski图中提出了CM-BDP的光物理过程。此外，CM-BDP 还应用于细胞内实验和斑马鱼成像。在光/暗毒性实验中，暗毒性实验的细胞存活率基本高于90%，而在辐照下显着下降。吖啶橙/溴化乙锭(AO/EB)染色实验结果表明CM-BDP在辐照下可以有效杀死A-549癌细胞，斑马鱼的荧光成像证明CM-BDP可以进一步应用于生物体。