A Semiconductor Bulk Material That Emits Direct White Light

Ki, Wooseok; Li, Jing

doi:10.1021/ja801601y

Cited by 198 publications

(123 citation statements)

References 21 publications

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“…(2) Inorganic phosphors require metal ion doping in order to achieve white-light emission. 55,56 (3) Whitelight emitting multi-layer films can be prepared by mixing various color-emitting QDs but the devices suffer significant deficiency due to the self-absorption process that arises from different sized nanoclusters. Our organic-inorganic hybrid PNCs obviate all these drawbacks.…”

Section: Fig 2 X-ray Diffraction (Xrd) Analysis Of the Bulk Perovskimentioning

confidence: 99%

Pure white-light emitting ultrasmall organic–inorganic hybrid perovskite nanoclusters

et al. 2016

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Organic-inorganic hybrid perovskites, direct band-gap semiconductors have shown tremendous promise for optoelectronic device fabrication. We report the first colloidal synthetic approach to prepare ultrasmall (~1.5 nm diameter), white light emitting, organic-inorganic hybrid perovskite nanoclusters. The nearly pure white-light emitting ultrasmall nanoclusters were obtained by selectively manipulating the surface chemistry (passivating ligands and surface trap-states) and controlled substitution of halide ions. The nanoclusters displayed a combination of band-edge and broadband photoluminescence properties, covering a major part of the visible region of the solar spectrum with unprecedentedly large quantum yields of ~12% and photoluninescence lifetime of ~20 ns. The intrinsic white light emission of perovskite nanoclusters makes them ideal and low cost hybrid nanomaterials for solid-state lighting applications.The ever-increasing global demand for energy drives the need to discover highly efficient materials capable of saving energy in solid-state lighting (SSL) applications, such as light-emitting diodes (LEDs). 1,2 In this context, pure white-light emitting materials, and their subsequent uses in LED fabrication, will be a most effective way to reduce global power consumption. Currently, white-light LEDs are prepared by: (i) mixing single wavelength emitting organic phosphors, 3 and (ii) constructing multi-layer films composed of blue, green, and red color emitting semiconductor quantum dots (QDs). 4,5 However, the self-absorption process between different organic phosphors reduces device efficiency, a similar device characteristic that has also been observed for QD-based LEDs. Ultrasmall semiconductor nanoclusters (e.g., CdSe) display white-light, but they require expensive, complicated and high temperature synthetic methods. [6][7][8] Recently, white-light emitting bulk organic-inorganic perovskites were synthesized, 9,10 which would not only expand SSL research but also facilitate inexpensive LED fabrication. Scheme 1. Schematic Presentation of the Synthesis of White-Light Emitting Organolead Bromide Perovskite NanoclustersIn this communication, we report the first colloidal synthetic method to prepare white-light emitting, ultrasmall (~1.5 nm diameter) methylammonium lead bromide (MAPbBr3) perovskite nanoclusters (PNCs). Their synthesis is outlined in Scheme 1 and the detailed procedure is provided in the Electronic Supplementary Information (ESI) file. These PNCs display a combination of band-edge and broadband photoluminescence (PL) with a quantum yield (QY) of ~5% and PL lifetime of ~7 ns. We hypothesize that the broad emission properties originate from the presence of surface-related midgap trap-states. Furthermore, we showed selective manipulation of band-gap and trap-states via the preparation of mixed halide (MAPbClxBr3-x) PNCs through controlled anion exchange reactions enhanced both QY and PL lifetime at least two-fold. We believe these ultrasmall PNCs will provide fundamentally important informati...

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Section: Fig 2 X-ray Diffraction (Xrd) Analysis Of the Bulk Perovskimentioning

confidence: 99%

Pure white-light emitting ultrasmall organic–inorganic hybrid perovskite nanoclusters

et al. 2016

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“…Metal halide infinite layers and chalcogenide molecular clusters comprise heavier and more polarizable atoms (S, Cl, Se, Br, and I), and exhibit characteristic electronic property owing to their polymeric structures such as semiconductivity [13,16,[82][83][84][85][91][92][93][94] or photoluminescence [13,16,85,90]. Surfactant hybrid crystals composed from these metal halide and chalcogenide polymeric anions can be applicable to dye-sensitized solar cells [95,96] and electronic devices [97].…”

Section: Hybrid Surfactant Single Crystals With Discrete Inorganic Anmentioning

confidence: 99%

Inorganic–Organic Hybrid Surfactant Crystals: Structural Aspects and Functions

Ito

2016

Crystals

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Hybrid single crystals consisting of an organic surfactant and an inorganic moiety are promising functional materials. Layered crystals composed from alternate inorganic and surfactant layers are obtained by the template effect of long alkyl chain moiety. The composition, crystal packing, and molecular arrangement of the hybrid single crystals are controllable by changing the inorganic constituent and the surfactant molecular structure. The types of hybrid surfactant single crystals are twofold: (i) crystals consisting of discrete inorganic cation coordinated by ligands having amphiphilic moiety; and (ii) crystals comprising a surfactant cation and a discrete inorganic anion including polyoxometalate (POM) oxide clusters. The POM-surfactant hybrid single crystals are rather rare, and therefore promising as unprecedented functional materials. Their structural variation and functional properties are discussed.

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“…The mercury atom is coordinated by four chlorine atoms to yield a HgCl 4 2-tetrahedron, with the bond lengths of Hg-Cl ranging from 2.350(1) to 2.8100(9) Å and the average value being 2.536(1) Å, which is similar to those reported [8,9]. Each HgCl 4 2-tetrahedron interconnects to two neighboring ones via corner-sharing to form a 1-D (HgCl 3 ) -anionic chain (Figure 1).…”

Section: Resultsmentioning

confidence: 99%

“…The growing interest in the field of the crystal engineering of inorganic-organic hybrid materials is justified by the potential applications of these materials as catalysts, zeolite-like materials, biological materials, magnetic functional materials [1][2][3][4][5]. To our knowledge, transition metal compounds containing group 12 elements are particularly attractive for many reasons, such as, the variety of coordination numbers and geometries provided by the d 10 configuration of the group 12 metal, semiconductive properties, photoluminescent properties, and so on.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structure and photoluminescence of (HgCl3)n (C6NO2H6)n(C6NO2H5)n•nH2O

Chen

2011

Bull. Chem. Soc. Eth.

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ABSTRACT ABSTRACT. A new isonicotinic acid compound with infinite mercury halide anionic chains, (HgCl3)n(C6NO2H6)n(C6NO2H5)n·nH2O (1), was obtained from the hydrothermal reaction and structurally characterized by X-ray single diffraction. The title compound is characteristic of a one-dimensional structure, based on one-dimensional (HgCl3) -anionic chains, protonated isonicotinic acid, neutral isonicotinic acid molecules and lattice water molecules. The protonated isonicotinic acid, neutral isonicotinic acid molecules and lattice water molecules are interconnected via hydrogen bonds to form a three-dimensional supramolecular framework. The (HgCl3) -anionic chains are anchored in the voids of the supramolecular framework via hydrogen bonds. Photoluminescent investigation reveals that the title compound displays a strong emission in blue region. The emission band is identified as the π-π * transitions of the isonicotinic acid moieties. KEY WORDS KEY WORDS KEY WORDS

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A Semiconductor Bulk Material That Emits Direct White Light

Cited by 198 publications

References 21 publications

Pure white-light emitting ultrasmall organic–inorganic hybrid perovskite nanoclusters

Pure white-light emitting ultrasmall organic–inorganic hybrid perovskite nanoclusters

Inorganic–Organic Hybrid Surfactant Crystals: Structural Aspects and Functions

<b>Synthesis, structure and photoluminescence of (HgCl<sub>3</sub>)<sub><i>n</i></sub> (C<sub>6</sub>NO<sub>2</sub>H<sub>6</sub>)<sub><i>n</i></sub>(C<sub>6</sub>NO<sub>2</sub>H<sub>5</sub>)n•<i>n</i>H<sub>2</sub>O</b>

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