ph7b00675_si_001.pdf (1.52 MB)
Excitation-Independent Dual-Color Carbon Dots: Surface-State Controlling and Solid-State Lighting
journal contribution
posted on 2017-08-10, 00:00 authored by Daqin Chen, Haobo Gao, Xiao Chen, Gaoliang Fang, Shuo Yuan, Yongjun YuanLong-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 p-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.