One-step Synthesis of Solid-state Fluorescent Nitrogen-doped Carbonized Polymer Dots and Construction of Multicolor LEDs
Nitrogen-doped carbonized polymer dots(NCPDs)were prepared by one-step solvothermal method using citric acid,urea and acrylonitrile as raw materials,and ethanol as solvent.The particle size of NCPDs is about 12-22 nm.NCPDs powder not only can emit yellow fluorescence(λem=570 nm),but also has excellent concentra-tion-dependent fluorescence.Therefore,the NCPDs/silica sol composite films with different NCPDs mass fraction from 0.15%to 45%were prepared by dispersing NCPDs in silica sol,and the solid-state fluorescence emission wavelengths of these composites gradually shift from blue to red region(453-638 nm)with the increase of NCPDs concentration.Forthermore,those NCPDs composites have good fluorescence stability.The NCPDs composites were further applied to construct light emitting diodes(LEDs),and multicolor LEDs from blue light to red light can be obtained.In addition,the excellent solid-state fluorescence properties of NCPDs make them show potential application prospects in the field of fingerprint recognition,so their applicability in fingerprint recognition was also evaluated.
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