A5086036453- Silicon Nanostructures and Photoluminescence
- Luminescence Properties of Advanced Materials
- Diamond and Carbon-based Materials Research
- Nanowire Synthesis and Applications
- Electrowetting and Microfluidic Technologies
- Advanced Photocatalysis Techniques
- Biosensors and Analytical Detection
- Ion-surface interactions and analysis
- Luminescence and Fluorescent Materials
- Semiconductor materials and devices
- Quantum Dots Synthesis And Properties
- Electrophoretic Deposition in Materials Science
University of Illinois Urbana-Champaign
2012-2021
Present red phosphor converters provide spectra dominated by sharp lines and suffer from availability stability issues which are not ideal for color mixing in display or solid state lighting applications. We examine the use of mono dispersed 3 nm silicon nanoparticles, with inhomogeneously broadened luminescence as an effective substitute phosphors. tested a 3-phase hybrid nanophosphor consisting ZnS:Ag, ZnS:Cu,Au,Al, nanoparticles. Correlated temperature is examined under UV LED pumping...
In bulk single-crystal silicon, the semiconducting diamond-to-metallic \ss{}-Sn phase transformation nucleates on defects, and is manifested by a sharp uptake in light absorption at threshold of \ensuremath{\sim}11 Gpa, accompanied with creation nanosized (20--50 nm) fragmentation domains. We report observation linear uptakes luminescence insignificant spectral change ultrasmall 1-nm Si particles. associate gradual yield silicon-metal surface. The content points to surface stability for...
We used wet treatment to immobilize luminescent silicon nanoparticles on industrial glass fibers impart optical and chemical functions the fiber. Carpets or pads consisting of thousands are processed in parallel, enhancing sensitivity detection sampled volume. Treated exhibit strong luminescence, characteristic luminescence particles; showing no shift, broadening, reduction quantum efficiency. demonstrate that drawing material by pad due physical adsorption can be reversed. also allylamine...
Nano silicon is emerging as an active element for UV applications due to quantum confinement-induced widening of the Si bandgap, amenability integration on Si, and less sensitivity temperature. NanoSi-based include deep space exploration, high temperature propulsion, solar photovoltaics, particle detection in energy accelerators. However, viability technology limited by a complex nanoSi optical quenching instability. Here, we examined time dynamics UV-induced luminescence sub 3-nm nanoSi....
Silicon nanoclusters exhibit light emission with direct-like ns–µs time dynamics; however, they show variable synthesis and structure, optical, electronic characteristics. The widely adopted model is a core–shell in which the core an indirect tetrahedral absorbing Si phase, while shell network of re-structured H–Si–Si–H molecular emitting phases, two connected via back Si–Si bonds, exhibiting potential barrier, significantly hinders emission. We carried out first-principles atomistic...