Patir Khemnath, Gogoi Sonit Kumar
Department of Chemistry, Gauhati University, Guwahati, India.
Department of Applied Science and Humanities, Assam University, Silchar, India.
Front Chem. 2022 Mar 17;10:812602. doi: 10.3389/fchem.2022.812602. eCollection 2022.
Metal free room temperature phosphorescent materials have been the subject of considerable attention due to their potential applications in optoelectronic devices sensing, and security and safety signage. This study discusses how efficient fluorescent and phosphorescent chlorine doped carbon nitride dots (Cl-CNDs) were prepared by thermal treatment of guanidine hydrochloride. The Cl-CNDs prepared were characterized by field emission scanning electron microscope, dynamic light scattering, PXRD, EDX, Thermo gravimetric analysis, FT-IR, and UV-Visible spectroscopy. The Cl-CNDs exhibit a long phosphorescence lifetime of 657 ms and the phosphorescence quantum yield was found to be 2.32% upon being excited at 360 nm in ambient conditions. Formation of compact coreparticles via condensation along with hydrogen bonding of Cl-CNDs by its functional groups facilitate intersystem crossing and stabilizes the triplet states, favoring room temperature phosphorescence. The cost effective preparation and tunable optical properties of Cl-CNDs may find applications in security encryption and optoelectronic devices.
无金属室温磷光材料因其在光电器件传感、安全标识等方面的潜在应用而备受关注。本研究讨论了如何通过对盐酸胍进行热处理来制备高效的荧光和磷光氯掺杂氮化碳量子点（Cl-CNDs）。所制备的Cl-CNDs通过场发射扫描电子显微镜、动态光散射、粉末X射线衍射、能谱分析、热重分析、傅里叶变换红外光谱和紫外可见光谱进行了表征。Cl-CNDs在室温条件下于360 nm激发时表现出657 ms的长磷光寿命，磷光量子产率为2.32%。通过缩合形成紧密的核心颗粒以及Cl-CNDs官能团之间的氢键作用促进了系间窜越并稳定了三重态，有利于室温磷光。Cl-CNDs具有成本效益的制备方法和可调节的光学性质，可能在安全加密和光电器件中得到应用。
