Electrostatic Assembly Guided Synthesis of Highly Luminescent Carbon-Nanodots@BaSO₄ Hybrid Phosphors with Improved...

Carbon nanodots (CNDs)@BaSO₄ hybrid phosphors are fabricated in an easy and low-cost process by sequentially assembling Ba²⁺ and SO₄^2- ions onto the surface of carbon nanodots through electrostatic attraction. CNDs act as the nucleus to attract these reactive ions and provide the luminescent centers in the hybrid phosphors. This strategy is versatile for a variety of negatively charged CNDs with different emission colors. The advantage of the resultant hybrid phosphors is that their luminescence exhibits excellent thermal and photostability, as well as remarkable resistance to strong acid/alkali and common organic solvents. These merits allow for the fabrication of CNDs-based light-emitting diodes using the CNDs@BaSO₄ hybrid phosphors as a color conversion layer.