Evolution and fabrication of carbon dot-based room temperature phosphorescence materials

Abstract

Traditional room temperature phosphorescence (RTP) materials usually include organometallic composites and pure organic compounds, which generally possess the disadvantages of high toxicity, high cost and complicated preparation. Carbon dots (CDs)...

Zero-Dimensional Carbon Nanomaterials for Fluorescent Sensing and Imaging

“…When excitons are transferred to the triplet state (T 1 ) through the intersystem crossing, phosphorescence is detected . Because phosphorescence is hindered by both the spin-forbidden triplet exciton transitions and nonradiative decay, phosphorescence can only be observed at ultralow temperatures . Recently, 0D CNMs, especially CDs exhibiting RTP, have been increasingly reported. , …”

“…399 Because phosphorescence is hindered by both the spin-forbidden triplet exciton transitions and nonradiative decay, phosphorescence can only be observed at ultralow temperatures. 400 Recently, 0D CNMs, especially CDs exhibiting RTP, have been increasingly reported. 401,402 For constructing 0D CNMs exhibiting RTP, matrixcomposited 0D CNMs have been widely adopted.…”

Modulating multi-color room temperature phosphorescence emission for carbon dot composites with ultralong lifetime

“…Carbon dots, as zero-dimensional carbon-based nanoluminescent materials, have aroused enormous interest because of their low toxicity, facile synthesis, biocompatibility, high stability, and tunable optical properties. [14][15][16][17][18][19][20][21][22] In general, the optical properties of RTP CDs can be enhanced effectively by heteroatom doping that include F, 23 N, 24 P, 25 S, 26 etc. Besides, matrix-assisted synthesis is another important method to obtain RTP CDs by embedding CDs into a matrix such as cyanuric acid, 27 SiO 2 , 28 melamine, 29 polyvinyl alcohol (PVA) 30 and so on.…”

Unveiling Unconventional Luminescence Behavior of Multicolor Carbon Dots Derived from Phenylenediamine

“…1 Since CDs were first discovered in 2004, 2 researchers have devoted a great deal of effort to the related study of CDs, and various synthesis methods have successively appeared on the historical stage, which are mainly divided into two categories, namely, topdown and bottom-up. 3 Specifically, the top-down method refers to the stripping of large carbon sources to small fragments through physical or chemical methods, mainly including arc discharge, 4−6 laser ablation, 7,8 electrochemical synthesis, 9,10 and nanoetching. 11,12 However, the bottom-up method is usually used to synthesize quasi-spherical carbon nanoparticles from small molecular or polymer precursors, including combustion, 13 pyrolysis, 14 hydrothermal/solvothermal pyrolysis, 15−17 and microwave-assisted pyrolysis.…”

“…CDs possess many characteristics, such as excellent tunable optical properties, favorable biocompatibility, a wide range of raw material sources, and low cost . Since CDs were first discovered in 2004, researchers have devoted a great deal of effort to the related study of CDs, and various synthesis methods have successively appeared on the historical stage, which are mainly divided into two categories, namely, top-down and bottom-up . Specifically, the top-down method refers to the stripping of large carbon sources to small fragments through physical or chemical methods, mainly including arc discharge, − laser ablation, , electrochemical synthesis, , and nanoetching. , However, the bottom-up method is usually used to synthesize quasi-spherical carbon nanoparticles from small molecular or polymer precursors, including combustion, pyrolysis, hydrothermal/solvothermal pyrolysis, − and microwave-assisted pyrolysis. , Although there are various synthesis methods, most of the currently synthesized CDs emit blue/green fluorescence, and the fluorescent CDs with a long wavelength and high photoluminescence quantum yields (PLQYs) are difficult to obtain, which greatly limits the application of CDs in optoelectronic devices, biological imaging, and other fields.…”