Excitation-Independent Dual-Color Carbon Dots: Surface-State Controlling and Solid-State Lighting

Published on 2018-02-09T23:33:28Z (GMT) by
Long-wavelength orange-red emissions of carbon dots have recently attracted great attention due to their wide applications. Although it is possible to achieve long-wavelength luminescence by varying the incident excitation wavelength, excitation-independency is highly desired in terms of both practical applications and understanding emission mechanisms. In the present work, carbon dots with excitation wavelength independent orange and blue dual-color emissions were synthesized by a facile solvothermal route using <i>p</i>-phenylenediamine as carbon source and formamide as solvent. Structural and spectroscopic characterizations indicated that N- and O-related surface-state controlling via modifying reacting temperature/time was responsible for the dual-color emissions of carbon dots. Moreover, carbon solid film, retaining original orange emissions, was fabricated to explore its possible application as color converter in solid-state lighting. Impressively, by combining orange carbon film and yellow phosphor-in-glass with an InGaN blue chip, light-emitting diode devices with improved color-rendering index and correlated color temperature were successfully constructed.

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Chen, Daqin; Gao, Haobo; Chen, Xiao; Fang, Gaoliang; Yuan, Shuo; Yuan, Yongjun (2018): Excitation-Independent Dual-Color Carbon Dots: Surface-State

Controlling and Solid-State Lighting. ACS Publications.