UltrabrightFull Color Carbon Dots by Fine-Tuning Crystal Morphology ControllableSynthesis for Multicolor Bioimaging and Sensing

In this paper, two kinds of novel carbon nanocrystals (CNCs) with different crystal morphologies that the branch-chain young sprout form (CM1) and conifer-pine form (CM2) were obtained with a controllable way. The mechanism of crystal morphological development was explored well. While the two kinds of the CNCs were respectively dissolved in different polar solvents, which voluntarily become into “ultrafine crystals” at the moment, after that, the ultra bright full color CDs (UBFCCDs) have been preliminarily prepared by fine-controlling. With the evaporation of the solvents, the CNCs crystallized again, which could repeat back and forth for many times. After the conditions of preparing for CDs were optimized carefully, the as-prepared CDs exhibit ultra-bright effects of multi-excitation and multi-emission (from blue to red) and can show unique up-conversion luminescence characteristics under the lower excitation wavelength 660 nm instead of near-infrared wavelength 980 nm or 808nm. Significantly, the QY% o...