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DongdongMeng木虫 (著名写手)
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一篇珍贵的文献，收费有可能也下不到的。希望能帮到大家。 已有2人参与
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很不好下的文献“Highly Luminescent Lead Bromide Perovskite Nanoparticles Synthesized with Porous Alumina Media” 既然下到共享一下，希望能帮到各位。 |
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DongdongMeng
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Abstract: Nanocrystallinelead bromide perovskite was synthesized by rapidself-organization on a mesoporous aluminum oxidefilm. With UV excitation, thefilm exhibited anintense green emission with a narrow bandwidth. The photoluminescenceintensity is optimizedfor the conditions ofsynthesis and the kind ofmetal oxide. High surface areas and activities realized by nanotextured materials create efficient mediafor energy conversion with use of small amounts of resources such as metals, semiconductors, and organic compounds. 1 Among semiconductive material, metal halide perovskites have been investigated as a lowdimensionallayered compound,inwhich perovskite units are surrounded by organic methyl- or phenylammonium groups. These materials possess semiconductivity with band-gap structures confined by the organicmolecule, exhibiting attractive optical and electrical properties due to quantum size effects. To date, quantum wells,2,3 wires, 4 and dots 5,6 characterized as organic-inorganic perovskite compounds have also been synthesized. There are onlyafew reports on zero-dimensional pure perovskite nanocrystalswithout organic insulator layers 7 because it isdifficult on synthesis to control theirdimension. Amonglead halide type perovskites, bulk crystals, CH3NH3-PbX3(X=Br, Cl, and I), 8,9 can be synthesizedfrom CH3NH3X and PbX2 by solid-phase or solution-based self-organization techniques. Such preparation methods, however, have not been successfully applied to nanocrystallization oflead halide perovskite. In our previous report, we have shownfor thefirst time photoelectric conversion using the perovskite nanocrystals CH3NH3PbBr3 and CH3NH3PbI3 as visiblelight sensitizers to an n-type semiconductor, TiO2. 10 High quantum conversion efficiency,i.e., electroninjectionfrom these perovskites to TiO2 surfaces, was realized byformation of perovskite nanocrystalline particles with a diameter of2-3 nm successfully synthesized by a solution technique. Here, we report fabrication of an efficientlight emission medium created with the CH3NH3PbBr3 nanoparticles. Self-organized withinanoxide mesoporousfilm, the nanocrystals proved to be capableof highintensity, green photoluminescence. In this study, a thinAl2O3film was chosen as a mesoporous medium, which, as aninsulator, possess alarge energy band gap of 8.7 eV 11 and highionization potential 12 so that photonic energy absorbed by CH3NH3PbBr3 can befully converted toluminescence. Alow-viscosity Al2O3paste was prepared by mixing 2.4 g of Al2O3 nanopowder (spherical particlewith size 40-50 nm, Wako Pure Chemical), 1.5 mL ofacetylacetone, 3 mL ofpurified water, 14 mL of ethanol, and 2 g of poly(ethylene glycol) (average molecular weight: 20000«5000) and subsequent grinding with an agate mortar. The paste was spin-coated onto a quartz glass substrate (2.5 cm©2.5 cm) at 4000 rpmfollowed by sintering at 500 °Cfor 1 hinair. The resultant porous filmis mostly amorphous and has thickness ofabout 1ˉm as confirmed by scanning electron microscopy observations. Semiconductor |
4楼2013-12-03 10:04:12
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2楼2013-12-02 11:23:04
DongdongMeng
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3楼2013-12-03 10:00:46
