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Yellow-Emitting Carbon Nanodots and Their Flexible and Transparent Films for White LEDs
- Kim, Tak H., White, Alan R., Sirdaarta, Joseph P., Ji, Wenyu, Cock, Ian E., St. John, James, Boyd, Sue E., Brown, Christopher L., Li, Qin
- ACS Applied Materials & Interfaces 2016 v.8 no.48 pp. 33102-33111
- Artemia franciscana, bioassays, carbon, citric acid, color, encapsulation, nanotechnology, nauplii, optical properties, toxicity testing, urea
- 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 Artemia franciscana 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.