Direct white light emission from inorganic–organic hybrid semiconductor bulk materials

Ki, Wooseok; Li, Jing; Eda, Goki; Chhowalla, Manish

doi:10.1039/c0jm02213f

Cited by 61 publications

(26 citation statements)

References 19 publications

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“…13,14 Broadband, white-light generation has been reported in various 2D perovskites with general formula APbX4 (X=Cl, Br and A=bidentate organic cation), which makes them particularly attractive for solid-state lighting and displays. 15 In earlier works on closely related layered materials with formula Cd2−xZnxE2(alkylamine) (E=S, Se, and Te), [16][17][18] the broadband luminescence was ascribed to deep surface states related to the large effective surface area intrinsic of the layered structure. 17,19 In the 2D perovskite (API)PbBr4 (API=N-(3-aminopropyl)imidazole), the broadband photoluminescence spectrum was attributed by Li et al to emission from the organic linker, upon energy transfer from the inorganic framework.…”

Section: Introductionmentioning

confidence: 99%

Polaron self-localization in white-light emitting hybrid perovskites

et al. 2017

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Two-dimensional (2D) perovskites with general formula APbX4 are attracting increasing interest as solution processable, white-light emissive materials. Recent studies have shown that their broadband emission is related to the formation of intra-gap color centers; however, the nature and dynamics of the emissive species have remained elusive. Here we show that the broadband photoluminescence of the 2D perovskites (EDBE)PbCl4 and (EDBE)PbBr4 stems from the localization of small polarons within the lattice distortion field. Using a combination of spectroscopic techniques and first-principles calculations, we infer the formation of Pb2 3+ , Pb 3+ , and X2 -(where X=Cl or Br) species confined within the inorganic perovskite framework.Due to strong Coulombic interactions, these species retain their original excitonic character and form self-trapped polaron-excitons acting as radiative color centers. These findings are expected to be applicable to a broad class of white-light emitting perovskites with large polaron relaxation energy.3

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Section: Introductionmentioning

confidence: 99%

Polaron self-localization in white-light emitting hybrid perovskites

et al. 2017

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“…It is therefore important to develop single-component white LED materials. [4][5][6][7] On the other hand, functional coordination polymers have received a lot of attention in recent years due to their potential applications in optical, electronic, magnetic, molecular sensing, catalysis, and porous gas adsorption materials. [8][9][10][11][12][13][14][15] In particular, luminescent coordination polymers have flourished because of their utilities as LEDs, chemosensors, sensors, probes, and so on.…”

Section: Introductionmentioning

confidence: 99%

Isostructural Metal–Anion Radical Coordination Polymers with Tunable Phosphorescent Colors (Deep Blue, Blue, Yellow, and White) Induced by Terminal Anions and Metal Cations

Yong

She

et al. 2011

Chemistry A European J

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Five phosphorescent metal-anion radical coordination polymers based on a new anion radical ligand generated by in situ deprotonation of a stable zwitterionic radical are described. The N,O,N-tripodal anion radical ligand links metal cations, which leads to five isostructural coordination polymers, [M(3)(bipo(-.))(4)(L)(2)](n) (M=Cd or Mn, Hbipo(-.)=2,3'-biimidazo[1,2-a]pyridin-2'-one, L=Cl(-), HCOO(-) or SCN(-)). The isostructural coordination polymers exhibit novel one-dimensional spirocycle-like structures. Three isostructural Cd(II) coordination polymers display unusual phosphorescent color changes (blue, yellow, and white) induced by terminal anions. Significantly, the Cd(II) coordination polymer with terminal Cl(-) possesses moderate quantum yield, and shows a bright white-light phosphorescence emission, which is independent of excitation wavelength and can even be excited by visible light. Upon adjusting the metal cation to Mn(II), two isostructural Mn(II) coordination polymers reveal deep-blue-light phosphorescence emissions that are independent of terminal anions. As radical-based coordination polymers, some of them show antiferromagnetic interactions between radical species or radical and metal center.

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“…Existing examples of nanomaterials that directly emit white light include hybrid semiconductor materials such as 2D-[Cd 2 Se 2 (ba):Te] (ba ¼ bultylamine), 1 ZnO nanoparticles mixed with graphene, 2 CdSe-ZnS core-shell nanocrystals hybridized with InGaN/GaN, 5 and some others. However, white light emitting nanomaterials composed of a single chemical element remain quite rare.…”

Section: Introductionmentioning

confidence: 99%