Surface ionization-induced tunable dynamic phosphorescence colors from carbon dots on paper for dynamic multimode encryption

Revealing the synergetic interaction between amino and carbonyl functional groups and their effect on the electronic and optical properties of carbon dots

“…Like other nitrogen functional groups, the nitrogen presence was reported to reduce the bandgap energy of CDs, owing to their served surface state. 26,42,48 The bandgap energy of amino CDs is slightly altered as increasing the N/C ratio from 0.02 to 0.11. Moreover, the bandgap energy reduction from 2.69 to 2.44 eV was caused by an N/C ratio of 0.02 to 0.22 (fully aminated functionalized).…”

Paper-Fiber-Activated Triplet Excitons of Carbon Nanodots for Time-Resolved Anti-counterfeiting Signature with Artificial Intelligence Authentication

“…The CNDs mainly contain C, N, O, and P elements, as shown in Figure S5b. The high-resolution XPS spectrum of N 1s indicates the presence of N atoms mainly in the form of pyrrolic N (399.6 eV) and graphitic N (400.9 eV) . The peak at 133.3 eV in the P 2p spectrum (bottom of Figure S5c) attributes to the P–O bond .…”

“…The high-resolution XPS spectrum of N 1s indicates the presence of N atoms mainly in the form of pyrrolic N (399.6 eV) and graphitic N (400.9 eV). 40 The peak at 133.3 eV in the P 2p spectrum (bottom of Figure S5c) attributes to the P−O bond. 41 The excitation− fluorescence contour plots of the CNDs are shown in Figure S6a.…”

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

“…Realizing the final application is the value of a material. 110,126,127,[144][145][146][147][148][149][150] information encryption, 113,115,118,119,121,123,128,[151][152][153][154][155][156][157][158][159][160] sensor detection, 114,124,129,130,147,[161][162][163][164][165][166][167][168][169][170][171][172][173][174] LEDs, [175][176][177][178]…”

“…It allows significantly increased time to visualize cell states, enables speedy detection, and also facilitates bioimaging and detection. Generally speaking, the RTP material based on CDs possesses huge application prospects in the field of anti-counterfeiting, 110,126,127,144–150 information encryption, 113,115,118,119,121,123,128,151–160 sensor detection, 114,124,129,130,147,161–174 LEDs, 175–179 biological imaging, 134,180,181 logic gates, 133 fluorescent ink 112,182–184 and other fields 116,117,122,185–195 with the properties of DF, TADF, long afterglow life and adjustable afterglow color.…”