Orange-red,green,and blue fluorescence carbon dots for white light emitting diodes

• 作者: Ling Jin Li Zhang Lei Yang Xingrong Wu Cheng Zhang Kang Wei Lifang He Xinya Han Hongbin Qiao Abdullah M.Asiri Khalid A.Alamry Kui Zhang
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（15）
• 页码范围: 184-191
• 页数: 8页
• 语种: 英文

摘要

Fluorescent carbon dots (CDs) are admirable nanomaterials due to their superior optical properties and low cost.However,regulation of the emission colors in CDs for lighting device still remains a challenge.In this work,we developed a green hydrothermal method to obtain three emission colors of CDs using L-tyrosine (for blue CDs),o-phenylendiamine (for green CDs) and L-tyrosine/o-phenylendiamine mixture(for orange-red CDs).These CDs possess good water dispersibility,strong emission with high quantum yields,and excellent photostability.Furthermore,the resulting CDs were dispersed in polyvinyl alcohol(PVA) matrix to yield solid state films,where the self-quenching effect in solid state was effectively avoided.A full-color light-emitting diode was fabricated by packing the CDs-PVA composites on the top of a UV-chip,which have superior potential applications in CDs-based solid-state lighting system.