2017
DOI: 10.1021/jacs.7b01312
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White-Light Emission and Structural Distortion in New Corrugated Two-Dimensional Lead Bromide Perovskites

Abstract: Hybrid inorganic-organic perovskites are developing rapidly as high performance semiconductors. Recently, two-dimensional (2D) perovskites were found to have white-light, broadband emission in the visible range that was attributed mainly to the role of self-trapped excitons (STEs). Here, we describe three new 2D lead bromide perovskites incorporating a series of bifunctional ammonium dications as templates which also emit white light: (1) α-(DMEN)PbBr (DMEN = 2-(dimethylamino)ethylamine), which adopts a unique… Show more

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Cited by 577 publications
(654 citation statements)
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“…In 2014, intrinsic, broadband white-light emission was observed from the corrugated-2D lead-halide perovskites (N-MEDA)PbBr 4 and (EDBE)PbX 4 (N-MEDA = N 1 -methylethane-1,2-diammonium; EDBE = 2,2 -(ethylenedioxy)bis(ethylammonium); X = Cl and Br) (Figure 6(a)). In addition to '2 × 2' corrugated 2D structure, this family has been extended to '3 × 3' [109] (Figure 6(b)) and '4 × 4' [110] types. More recently, corrugated-2D perovskites have been used to stabilize the α-CsPbI 3 phase and achieve a record PCE of 11.8% by connecting α-CsPbI 3 crystallites for effective electron transfer and passivating the surface defects [111].…”
Section: Corrugated-2d Organic Metal Halide Hybridsmentioning
confidence: 99%
“…In 2014, intrinsic, broadband white-light emission was observed from the corrugated-2D lead-halide perovskites (N-MEDA)PbBr 4 and (EDBE)PbX 4 (N-MEDA = N 1 -methylethane-1,2-diammonium; EDBE = 2,2 -(ethylenedioxy)bis(ethylammonium); X = Cl and Br) (Figure 6(a)). In addition to '2 × 2' corrugated 2D structure, this family has been extended to '3 × 3' [109] (Figure 6(b)) and '4 × 4' [110] types. More recently, corrugated-2D perovskites have been used to stabilize the α-CsPbI 3 phase and achieve a record PCE of 11.8% by connecting α-CsPbI 3 crystallites for effective electron transfer and passivating the surface defects [111].…”
Section: Corrugated-2d Organic Metal Halide Hybridsmentioning
confidence: 99%
“…[14] The exciton self-trapping associated with inorganic lattice distortions and strong excitonphonon coupling cause broad emission with a large Stokes shift. [14] The exciton self-trapping associated with inorganic lattice distortions and strong excitonphonon coupling cause broad emission with a large Stokes shift.…”
Section: Broadband Emissionmentioning
confidence: 99%
“…[16,17,[21][22][23][24][25] The long-term stability of 3D halide perovskites with organic cations is still an open issue and under intense investigation. [26][27][28][29][30] 2D perovskites adopt a general formula of A′ 2 A n−1 M n X 3n+1 or BA n−1 M n X 3n+1 , where A′ and A are univalent organic cations, B is a divalent organic cation, M is a divalent metal, and X is a halide ion. 2D halide perovskites with bulky organic cations are attracting attention because of their better moisture resistance by the protection of the hydrophobic organic spacer layer.…”
mentioning
confidence: 99%