Carbon Dots Exhibiting Concentration-Dependent Full-Visible-Spectrum Emission for Light-Emitting Diode Applications

• DOI: 10.1021/acsami.9b14472
• Publication Date: 2019-11-13T12:23:10Z
• Authors: Yongqiang Zhang; Junhao Xiao; Peng Zhuo; Hao Yin; Yi Fan; Xingyuan Liu; Zhenqiang Chen
• Keywords: Cyan; Gamut; Color rendering index; Visible spectrum; NTSC; Luminous efficacy; Color temperature

Carbon dots (CDs) that exhibit emission over the whole visible spectrum are desired for use in light-emitting diodes (LEDs). Here, CDs displaying tunable fluorescence region synthesized. Different concentrations of uniformly dispersed epoxy resin and coated on 405 nm LED chips to obtain monochrome blue, cyan, green, yellow, red, deep red LEDs yield a color gamut covering 99.4% National Television Standards Committee (NTSC) standard. These display similar high stability. Furthermore, warm neutral white produced by coating cyan- red-emitting CD layers chips, achieving color-rendering indexes (CRIs) 96.4 96.6, respectively. Two fluorescent conversion derived from one material at different simplify preparation high-CRI LEDs. The uniform weak changes cyan photoluminescence peaks during operation ensure stability these CD-based This research provides new avenue develop low-cost, easy-to-prepare with colors as alternative phosphors LED-based high-performance displays lighting.