5 research outputs found
Yellow-Emitting Carbon Nanodots and Their Flexible and Transparent Films for White LEDs
We report carbon nanodots that can
be utilized as effective color converting phosphors for the production
of white light-emitting diodes (LEDs). Blue-excitable and yellow-emitting
carbon nanodots, functionalized with 3-(imidazolidin-2-on-1-yl)propylmethyldimethoxysilane
(IPMDS)-derived moieties (IS-CDs), are synthesized by a novel one-pot
reaction in which the products from the initial reaction occurring
between urea and 3-(2-aminoethylamino)propylmethyl-dimethoxysilane
(AEPMDS) are further treated with citric acid. Distinctive from the
majority of carbon nanodots reported previously, IS-CDs emit at 560
nm, under 460 nm excitation, with a quantum yield of 44%. Preliminary
toxicity studies, assessed by the <i>Artemia franciscana</i> nauplii (brine shrimp larvae) bioassay, indicate that IS-CDs are
largely nontoxic. Furthermore, the IS-CDs form flexible and transparent
films without the need of encapsulating agents, and the solid films
retain the optical properties of solvated IS-CDs. These features indicate
an immense potential for the IS-CDs as an environmental-friendly,
blue-excitable carbon nanodot-based phosphor in solid-state lighting
devices