![]() Enlarging the conjugation size of CNDs can lead to longer wavelength emissions due to the decrease in system energy caused by the increase in electron delocalization. The conjugation size modulation of CNDs as the most accepted method has been used to produce colorful, glowing CNDs. Modulating the wavelength and brightening the triplet excitons of CNDs are the key points for inducing UV phosphorescence. Thus, the development of UV phosphorescent CNDs is of great importance and significance considering their attractive applications in UV light-emitting devices, sterilization and so on 12, 13, 14. In particular, ultraviolet (UV) phosphorescent CNDs that can emit high-energy photons over a long duration have not been realized. However, most phosphorescence of CNDs is centered in the visible region, and there remains an issue of limited phosphorescence wavelengths. To date, room temperature phosphorescent CNDs have facilitated amazing advances in optoelectronics devices, time-resolved imaging, and phosphorescence bioimaging, due to the efforts of scientists 6, 7, 8, 9, 10, 11. Their relatively easy preparation process, unique optical properties, and high biocompatibility make them especially fascinating in the field of bioscience and technology 3, 4, 5. This work provides a rational design strategy for UV phosphorescent CNDs and demonstrates their novel antibacterial applications.Ĭarbon nanodots (CNDs) as promising phosphorescence candidates develop rapidly 1, 2. As a demonstration, the UV phosphorescent CNDs were used for inactivating gram-negative and gram-positive bacteria through the emission of their high-energy photons over a long duration, and the resulting antibacterial efficiency reached over 99.9%. By further tailoring the size of the CNDs, the phosphorescence wavelength can be tuned to 348 nm, and the room temperature lifetime of the CNDs can reach 15.8 ms. The confinement caused by the NaCNO crystal reduces the energy dissipation paths of the generated triplet excitons. ![]() The electron transition from the p x to the sp 2 orbit of the N atoms within the CNDs can generate one-unit orbital angular momentum, providing a driving force for the triplet excitons population of the CNDs. ![]() Herein, the UV phosphorescence of CNDs was achieved by decreasing conjugation size and in-situ spatial confinement in a NaCNO crystal. Phosphorescent carbon nanodots (CNDs) have generated enormous interest recently, and the CND phosphorescence is usually located in the visible region, while ultraviolet (UV) phosphorescent CNDs have not been reported thus far. ![]()
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