White‐Light‐Emitting Melamine‐Formaldehyde Microspheres through Polymer‐Mediated Aggregation and Encapsulation of Graphene Quantum Dots

• DOI: 10.1002/advs.201801432
• Publication Date: 2018-12-19T15:18:36Z
• Authors: Youshen Wu; Hui Zhang; Aizhao Pan; Qi Wang; Yanfeng Zhang; Guijiang Zhou; Ling He
• Keywords: Graphene quantum dot; Color rendering index; Prepolymer

Abstract Graphene quantum dot (GQD) encapsulated melamine‐formaldehyde (MF) polymer microspheres with uniform particle size and tunable high‐quality white‐light emissions are prepared via a polymer‐mediated GQD assembly encapsulation strategy. In solution, GQDs first aggregated MF prepolymer through electrostatic interaction further inside the formed by polymerization of under acid catalysis heating. During this process, fixed in matrix their emission extended from blue to full visible range, presenting bright white luminescence ultraviolet excitation. The white‐light‐emitting GQD‐MF exhibit morphology an average 2.0 ± 0.08 µm properties effectively regulated doping concentration matrix. A series yields 0.83 0.43, Commission Internationale de L'Eclairage coordinates (0.28, 0.28) (0.33, 0.32), color rendering index 0.75 0.88 obtained excellent photostability thermal stability. By dispersing cross‐linked polydimethylsiloxane matrix, flexible film dual functions light diffusion is successfully applied for light‐emitting diode fabrication.