Long-emission carbon dots (CDs) is triggering immense enthusiasm on account of their intrinsic merits of high chemical stability and excellent optical properties. In this study, a facile and rapid approach was developed for the preparation of barium-doped carbon dots (Ba-CDs) with yellow fluorescence emission and high quantum yields. Surface chemistry and the chemical architecture of the Ba-CDs was revealed under various spectroscopic methods. This work provides more insights into the effects of charge transfer caused by Ba heteroatoms, which is considered as the most challenging step in the investigation on luminescence mechanism. Remarkably, the prepared Ba-CDs were successfully applied as fluorescent probes in the detection of trace water in organic solvents (ethanol, isopropanol, acetone, tetrahydrofuran). Comparing with traditional fluorescent probes for water detection in organic solvents, Ba-CDs detection provides a more sensitive, much faster and more economical approach.

长发光碳点（CDs）具有高化学稳定性和出色的光学特性的内在优点，因此引起了极大的热情。在这项研究中，开发了一种简便而快速的方法来制备具有黄色荧光发射和高量子产率的掺杂钡的碳点（Ba-CD）。Ba-CDs的表面化学和化学结构在各种光谱方法下得以揭示。这项工作为由Ba杂原子引起的电荷转移的影响提供了更多的见解，这被认为是研究发光机理中最具挑战性的步骤。值得注意的是，所制备的Ba-CDs已成功地用作荧光探针，用于检测有机溶剂（乙醇，异丙醇，丙酮，四氢呋喃）中的痕量水。