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About: Photoluminescence is a(n) research topic. Over the lifetime, 83414 publication(s) have been published within this topic receiving 1850414 citation(s). more


Open accessJournal ArticleDOI: 10.1103/PHYSREVLETT.105.136805
Kin Fai Mak1, Changgu Lee2, James Hone1, Jie Shan3  +1 moreInstitutions (3)
Abstract: The electronic properties of ultrathin crystals of molybdenum disulfide consisting of N=1,2,…,6 S-Mo-S monolayers have been investigated by optical spectroscopy Through characterization by absorption, photoluminescence, and photoconductivity spectroscopy, we trace the effect of quantum confinement on the material's electronic structure With decreasing thickness, the indirect band gap, which lies below the direct gap in the bulk material, shifts upwards in energy by more than 06 eV This leads to a crossover to a direct-gap material in the limit of the single monolayer Unlike the bulk material, the MoS₂ monolayer emits light strongly The freestanding monolayer exhibits an increase in luminescence quantum efficiency by more than a factor of 10⁴ compared with the bulk material more

Topics: Monolayer (61%), Direct and indirect band gaps (59%), Photoconductivity (57%) more

11,041 Citations

Journal ArticleDOI: 10.1063/1.103561
Abstract: Indirect evidence is presented that free‐standing Si quantum wires can be fabricated without the use of epitaxial deposition or lithography. The novel approach uses electrochemical and chemical dissolution steps to define networks of isolated wires out of bulk wafers. Mesoporous Si layers of high porosity exhibit visible (red) photoluminescence at room temperature, observable with the naked eye under <1 mW unfocused (<0.1 W cm−2) green or blue laser line excitation. This is attributed to dramatic two‐dimensional quantum size effects which can produce emission far above the band gap of bulk crystalline Si. more

Topics: Quantum wire (55%), Band gap (53%), Silicon (53%) more

7,284 Citations

Journal ArticleDOI: 10.1021/NL903868W
Andrea Splendiani1, Liang Sun1, Yuanbo Zhang1, Tianshu Li2  +5 moreInstitutions (3)
15 Mar 2010-Nano Letters
Abstract: Novel physical phenomena can emerge in low-dimensional nanomaterials. Bulk MoS2, a prototypical metal dichalcogenide, is an indirect bandgap semiconductor with negligible photoluminescence. When the MoS2 crystal is thinned to monolayer, however, a strong photoluminescence emerges, indicating an indirect to direct bandgap transition in this d-electron system. This observation shows that quantum confinement in layered d-electron materials like MoS2 provides new opportunities for engineering the electronic structure of matter at the nanoscale. more

Topics: Transition metal dichalcogenide monolayers (59%), Photoluminescence (55%), Monolayer (54%) more

6,781 Citations

Journal ArticleDOI: 10.1021/CR00033A003
01 Jan 1995-Chemical Reviews
Abstract: A review with 156 refs. on interfacial electron transfer reactions in colloidal semiconductor solns. and thin films and their application for solar light energy conversion and photocatalytic water purifn. Some of the topics discussed include; optical and electronic properties of colloidal semiconductor particles, quantum size effects in the photoluminescence of colloidal semiconductors, light-induced charge sepn., dynamics of interfacial charge transfer processes, properties and prepn. of nanocryst. semiconductor electrodes, energetics and operations of the nanoporous solar cell. more

Topics: Semiconductor (52%), Solar cell (52%), Photoluminescence (51%) more

4,937 Citations

Open accessJournal ArticleDOI: 10.1021/NL5048779
02 Feb 2015-Nano Letters
Abstract: Metal halides perovskites, such as hybrid organic–inorganic CH3NH3PbI3, are newcomer optoelectronic materials that have attracted enormous attention as solution-deposited absorbing layers in solar cells with power conversion efficiencies reaching 20%. Herein we demonstrate a new avenue for halide perovskites by designing highly luminescent perovskite-based colloidal quantum dot materials. We have synthesized monodisperse colloidal nanocubes (4–15 nm edge lengths) of fully inorganic cesium lead halide perovskites (CsPbX3, X = Cl, Br, and I or mixed halide systems Cl/Br and Br/I) using inexpensive commercial precursors. Through compositional modulations and quantum size-effects, the bandgap energies and emission spectra are readily tunable over the entire visible spectral region of 410–700 nm. The photoluminescence of CsPbX3 nanocrystals is characterized by narrow emission line-widths of 12–42 nm, wide color gamut covering up to 140% of the NTSC color standard, high quantum yields of up to 90%, and radiativ... more

Topics: Quantum dot (53%), Photoluminescence (51%), Halide (51%) more

4,445 Citations

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Topic's top 5 most impactful authors

Bo Monemar

282 papers, 3.8K citations

S.J. Dhoble

279 papers, 2.9K citations

Alfred Forchel

198 papers, 3.6K citations

Elson Longo

179 papers, 6.2K citations

Yoshihiko Kanemitsu

172 papers, 7.5K citations

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