School of Physics, Harbin Institute of Technology, Harbin 150001, China.
School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
J Phys Chem B. 2023 Jan 26;127(3):777-782. doi: 10.1021/acs.jpcb.2c08415. Epub 2023 Jan 17.
Environmental heavy atoms can further enhance the room temperature phosphorescence (RTP) emissions of gadolinium-labeled hematoporphyrin monomethyl ether (Gd-HMME) by way of the external heavy atom effect (HAE). However, the macroscopic phosphorescence intensity covered the intrinsic effect of the environmental heavy atoms. In this study, a method of separating the external HAE from the total is performed, and a quantity to describe the intrinsic nature of external HAE is defined. The environmental Gd concentration evolution of the phosphorescent transition rate () is obtained by correlated absorption, emission, and time-resolved spectroscopy. The increases linearly with environmental Gd concentration, while the intercept coincides with that of the internal HAE. The slope κ could be calculated, and it is a quantity free of the Gd concentration and only relies on the type of environmental heavy atoms. In addition, the environmental Lu exhibits similar functionality to Gd in external HAE. Environmental Pd quenches the phosphorescence intensity macroscopically, while it enhances the HAE intrinsically. Our method provides an alternative insight into the intrinsic nature of environmental heavy atoms.
环境重原子可以通过外部重原子效应（HAE）进一步增强钆标记血卟啉单甲醚（Gd-HMME）的室温磷光（RTP）发射。然而，宏观磷光强度掩盖了环境重原子的固有效应。在本研究中，通过相关吸收、发射和时间分辨光谱，从总外部 HAE 中分离出外部 HAE，并定义了一个描述外部 HAE 固有性质的量。通过相关吸收、发射和时间分辨光谱，获得了磷光跃迁率（）与环境 Gd 浓度的演化关系。随着环境 Gd 浓度的增加，增加呈线性关系，而截距与内部 HAE 重合。斜率κ可以被计算出来，它是一个不依赖于 Gd 浓度的量，只依赖于环境重原子的类型。此外，环境 Lu 在外部 HAE 中表现出与 Gd 相似的功能。环境 Pd 宏观上猝灭磷光强度，而在本质上增强 HAE。我们的方法为深入了解环境重原子的固有性质提供了一种替代方法。
