J. Mater. Sci. Technol. ›› 2020, Vol. 50: 184-191.DOI: 10.1016/j.jmst.2020.03.020

• Research Article • Previous Articles     Next Articles

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

Ling Jina, Li Zhanga, Lei Yangb, Xingrong Wua,c, Cheng Zhanga, Kang Weia, Lifang Hea, Xinya Hana,*(), Hongbin Qiaoa,*(), Abdullah M. Asiri4, Khalid A. Alamry4, Kui Zhanga,*()   

  1. aSchool of Chemistry and Chemical Engineering, Anhui University of Technology, Ma 'anshan, 243032, China
    bDepartment of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
    cKey Laboratory of Mealurgical Emission Reduction & Resources Recycling, Ministry of Education (Anhui University of Technology), Ma 'anshan, 243002, China
    dChemistry Department, Faculty of Science, King Abdulaziz University, Jedah, 21589, Saudi Arabia
  • Received:2019-10-21 Revised:2020-01-09 Accepted:2020-01-09 Published:2020-08-01 Online:2020-08-10
  • Contact: Xinya Han,Hongbin Qiao,Kui Zhang

Abstract:

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.

Key words: Fluorescence, Photoluminescene, Carbon dots, Self-quenching effect, Light-emitting diode