Red, Green, and Blue Luminescence by Carbon Dots: Full‐Color Emission Tuning and Multicolor Cellular Imaging

Abstract

A facile approach for preparation of photoluminescent (PL) carbon dots (CDs) is reported. The three resulting CDs emit bright and stable red, green and blue (RGB) colors of luminescence, under a single ultraviolet-light excitation. Alterations of PL emission of these CDs are tentatively proposed to result from the difference in their particle size and nitrogen content. Interestingly, up-conversion (UC)PL of these CDs is also observed. Moreover, flexible full-color emissive PVA films can be achieved through mixing two or three CDs in the appropriate ratios. These CDs also show low cytotoxicity and excellent cellular imaging capability. The facile preparation and unique optical features make these CDs potentially useful in numerous applications such as light-emitting diodes, full-color displays, and multiplexed (UC)PL bioimaging.

Tunable Luminescence and Application in Dye-Sensitized Solar Cells of Zn(II)/Hg(II) Complexes: Methyl Substitution-Induced Supramolecular Structures Based on (E)-N-(6-Methoxypyridin-2-ylmethylene)arylamine Derivatives

“…The data of J sc , V oc , and FF for these devices are shown in Figure 7 and compiled in Table 4. The results indicate that the individually N719-sensitized device achieves a η value of 5.14% (with J sc = 13.26 mA/cm 2 , V oc = 0.66 V, and FF = 0.58), while the devices individually sensitized by L 1 , L 2 , and L 3 were found to show a low η value of 0.26% (with J sc = 1.77 mA/cm 2 (Table 4), it was found that the η values of these devices L 1 /N719, L 2 /N719, L 3 /N719, Zn3/ N719, and Hg3/N719 are 6.73%, 6.96%, 7.25%, 6.62%, and 5.70%, respectively, that is, cells individually sensitized by N719 (5.14%) show relatively lower efficiency. On the basis of the results of the above data, there is a dramatic influence of the substituent group and coordination on the DSSCs performance, and the η values increase in the order L 1 /N719 < L 2 / N719 < L 3 /N719 and Hg3/N719 < Zn3/N719 < L 3 /N719.…”

A carbon dots based fluorescent probe for selective and sensitive detection of hemoglobin

“…Fluorescent carbon dots (CDs), as a new type of carbon nanomaterials with sizes of less than 10 nm, have attracted tremendous attention in diverse research fields recently [1][2][3]. Compared with some conventional semiconductor quantum dots with heavy metal cores, CDs are superior in terms of low cytotoxicity, excellent aqueous solubility, good biocompatibility, broader photoluminescence profiles, and high photostability [4,5].…”

Production of yellow-emitting carbon quantum dots from fullerene carbon soot

“…CQDs emit blue light, with an exception of a few studies reporting longer wavelength emissions (such as the emission of red light) [31,[43][44][45]. Interestingly, the main product of the CQDs (sample IV) could emit yellow light, as evidenced from Fig.…”