Solid‐State Carbon Dots with Red Fluorescence and Efficient Construction of Dual‐Fluorescence Morphologies

Abstract

Stable solid-state red fluorescence from organosilane-functionalized carbon dots (CDs) with sizes around 3 nm is reported for the first time. Meanwhile, a novel method is also first reported for the efficient construction of dual-fluorescence morphologies. The quantum yield of these solid-state CDs and their aqueous solution is 9.60 and 50.7%, respectively. The fluorescence lifetime is 4.82 ns for solid-state CDs, and 15.57 ns for their aqueous solution. These CDs are detailedly studied how they can exhibit obvious photoluminescence overcoming the self-quenching in solid state. Luminescent materials are constructed with dual fluorescence based on as-prepared single emissive CDs (red emission) and nonfluorescence media (starch, Al O , and RnOCH COONa), with the characteristic peaks located at nearly 440 and 600 nm. Tunable photoluminescence can be successfully achieved by tuning the mass ratio of CDs to solid matrix (such as starch). These constructed dual-fluorescence CDs/starch composites can also be applied in white light-emitting diodes with UV chips (395 nm), and oxygen sensing.

Solvent‐Controlled Synthesis of Highly Luminescent Carbon Dots with a Wide Color Gamut and Narrowed Emission Peak Widths

“…When the B‐CDs, G‐CDs, and R‐CDs are mixed by a weight ratio of 2:3:2, a pure white‐light emissive CDs/PVA composite film with CIE color coordinates of (0.33, 0.33) is obtained dramatically. This white‐light emitting film has a QY of 39%, which is remarkable for white‐light emitting CDs at present . The corresponding PL spectrum in Figure d exhibits three distinct emission bands, in accordance with the emission peaks of the original CDs/PVA films.…”

Controllable Photoluminescent and Nonlinear Optical Properties of Polymerizable Carbon Dots and Their Arbitrary Copolymerized Gel Glasses

“…Additionally, as one of tri‐primary colors, the red emissive CDs with QYs over 30% are barely reported . To the best of our knowledge, there are rare reports about polymerizable red emissive CDs …”

Temperature-controlled spectral tuning of full-color carbon dots and their strongly fluorescent solid-state polymer composites for light-emitting diodes

“…It may be noted that immobilizing CDs in a solid matrix is a suitable way to overcome their emission quenching in the solid state. [33][34][35][36][37] For example, Zhou et al prepared CDs@BaSO 4 hybrid phosphors by assembling Ba 2+ and SO 4…”