4 years ago

2D Arrangement of Polymer Microsphere Photonic Cavities Doped with Novel N-Rich Carbon Quantum Dots Display Enhanced One- and Two-Photon Luminescence Driven by Optical Resonances

2D Arrangement of Polymer Microsphere Photonic Cavities Doped with Novel N-Rich Carbon Quantum Dots Display Enhanced One- and Two-Photon Luminescence Driven by Optical Resonances
Rajadurai Chandrasekar, Radhika Vattikunta, Sri Ram G. Naraharisetty, Mari Annadhasan, Dasari Venkatakrishnarao, Chakradhar Sahoo
Luminescent carbon dots (CDs) are emerging as a potential eco-friendly alternative to standard metal-based semiconductor quantum dots. A solvatothermal method to prepare crystalline, nitrogen-rich, surface-passivated, and rare excitation wavelength-independent green-emitting (λmax ≈ 522 nm in solution and 536 nm in solid) CDs from a pyridine diamine precursor in ethanol solvent is reported here. In comparison to a neat thin film of CDs, a film of CD-doped polystyrene microspheres (PS-CDs) displays a remarkable enhancement of the photoluminescence emission intensity driven by optical cavity effect of the composite microspheres. Apart from downconversion one-photon luminescence, upon excitation with 800 nm femtosecond pulse laser, pure CDs and PS-CDs exhibit enhanced upconversion two-photon luminescence in the range of about 410–580 nm. A cost-effective solvatothermal method produces nitrogen-rich, surface-passivated carbon dots (CDs) exhibiting excitation-independent green emission. Further, a thin film of CD-doped polystyrene microspheres displays a remarkable enhancement of one- and two-photon luminescence intensity driven by the optical resonance effect.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adom.201700695

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