Journal Article10.1021/ACS.JPCC.7B08054
Size-Dependent Photoluminescence Efficiency of Silicon Nanocrystal Quantum Dots
Yixuan Yu,Gang Fan,Andrea Fermi,Raffaello Mazzaro,Raffaello Mazzaro,Vittorio Morandi,Paola Ceroni,Detlef-M. Smilgies,Brian A. Korgel +8 more
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TL;DR: In this paper, the average diameter of silicon (Si) nanocrystals from experimentally determined photoluminescence (PL) emission peak energies was estimated using a finite confinement model.
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Abstract: Photoluminescence (PL) spectra were measured for dodecene-capped Si nanocrystals with a wide range of average diameters, from 1.8 to 9.1 nm. Nanocrystals larger than 3 nm exhibited relatively high PL quantum yields of 30%–45%. Smaller nanocrystals exhibited lower quantum yields that decreased significantly with reduced size. Because smaller nanocrystals also have lower optical absorption there is a significant biasing of the PL spectra by the larger nanocrystals. We show that with proper accounting of polydispersity and size-dependent quantum yields and optical absorption the effective mass approximation (EMA) accurately estimates the average diameter of silicon (Si) nanocrystals from experimentally determined PL emission peak energies. A finite confinement model is presented that explains the decreased PL quantum yields of the smaller diameter nanocrystals.
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Citations
Biocompatible and biodegradable inorganic nanostructures for nanomedicine: Silicon and black phosphorus
Meng Qiu,Ajay Singh,Dou Wang,Junle Qu,Mark T. Swihart,Han Zhang,Paras N. Prasad,Paras N. Prasad +7 more
TL;DR: This contribution reviews the latest advances in silicon and BP-based biomedical nanomaterials for disease diagnosis and therapy and their common feature characteristics as biodegradable biocompatible elemental semiconductors.
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Recent advances on fluorescent biomarkers of near-infrared quantum dots for in vitro and in vivo imaging.
TL;DR: In vitro and in vivo imaging of NIR QDs in the regions of 650–900 nm (NIR-I) and 1000–1450 nm ( NIR-II) are described and the recent progress in bio-imaging is summarized and the future trends are discussed.
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Achieving spin-triplet exciton transfer between silicon and molecular acceptors for photon upconversion.
Pan Xia,Emily K. Raulerson,Devin Coleman,Carter S. Gerke,Lorenzo Mangolini,Ming Lee Tang,Sean T. Roberts +6 more
TL;DR: The demonstration of spin-triplet exciton transfer from silicon to molecular triplet acceptors can critically enable new technologies for solar energy conversion, quantum information and near-infrared driven photocatalysis.
Introductory lecture: origins and applications of efficient visible photoluminescence from silicon-based nanostructures
TL;DR: A variety of silicon-based nanostructures with dimensions in the 1-5 nm range now emit tunable photoluminescence (PL) spanning the visible range, and a number of other proposed uses of ultra-efficient PL from "nano-Si" could become viable in cosmetics, catalysis, security and forensics.
Silicon Quantum Dots: Synthesis, Encapsulation, and Application in Light-Emitting Diodes.
TL;DR: This work aims to provide guidance en route to the development of the first stable Si-based light-emitting diode (LED) manufacturing, by summarizing the main achievements over the past few years concerning different Si quantum dot synthetic methods, LED formation and characteristics.
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