Polaron self-localization in white-light emitting hybrid perovskites

Cortecchia, Daniele; Yin, Jun; Bruno, Annalisa; Lo, Shu-Zee A.; Gurzadyan, Gagik G.; Mhaisalkar, Subodh; Brédas, Jean‐Luc; Soci, Cesare

doi:10.1039/c7tc00366h

Cited by 226 publications

(297 citation statements)

References 67 publications

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“…S7) to calibrate the integrated intensity. For (EDBE)PbCl 4 , the resulting light yield at 300 K is about ~8% of the maximum at 130 K. Since the light yield is linearly proportional to the photoluminescence quantum efficiency18 while the efficiency of charge transport to the recombination center is almost unity2429, the ratio of 8% is consistent with reported (EDBE)PbCl 4 photoluminescence quantum efficiency of less than 10% at room temperature. Light yields of MAPbI 3 and MAPbBr 3 are <1,000 photons/MeV at room temperature (see inset of Fig.…”

Section: Resultssupporting

confidence: 85%

“…iii. The unusually large Stokes shift of two-dimensional (EDBE)PbCl 4 could be particularly beneficial to the scintillation yield29, which is substantially reduced by self-absorption of the luminescence30. iv.…”

Section: Resultsmentioning

confidence: 99%

“…The larger light yield of (EDBE)PbCl 4 at room temperature can be explained by its extremely large exction-binding energy of about 360 meV29, which is typical of 2D perovskites and gives rise to a pronounced excitonic absorption below the band-edge (see Supplementary Fig. S4).…”

Section: Resultsmentioning

confidence: 99%

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X-ray Scintillation in Lead Halide Perovskite Crystals

Birowosuto

Cortecchia

Drozdowski

et al. 2016

Sci Rep

309

333

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Current technologies for X-ray detection rely on scintillation from expensive inorganic crystals grown at high-temperature, which so far has hindered the development of large-area scintillator arrays. Thanks to the presence of heavy atoms, solution-grown hybrid lead halide perovskite single crystals exhibit short X-ray absorption length and excellent detection efficiency. Here we compare X-ray scintillator characteristics of three-dimensional (3D) MAPbI3 and MAPbBr3 and two-dimensional (2D) (EDBE)PbCl4 hybrid perovskite crystals. X-ray excited thermoluminescence measurements indicate the absence of deep traps and a very small density of shallow trap states, which lessens after-glow effects. All perovskite single crystals exhibit high X-ray excited luminescence yields of >120,000 photons/MeV at low temperature. Although thermal quenching is significant at room temperature, the large exciton binding energy of 2D (EDBE)PbCl4 significantly reduces thermal effects compared to 3D perovskites, and moderate light yield of 9,000 photons/MeV can be achieved even at room temperature. This highlights the potential of 2D metal halide perovskites for large-area and low-cost scintillator devices for medical, security and scientific applications.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

X-ray Scintillation in Lead Halide Perovskite Crystals

Birowosuto

Cortecchia

Drozdowski

et al. 2016

Sci Rep

309

333

View full text Add to dashboard Cite

show abstract

“…3b), with the same features as those of self-trapped excitons observed in many metal halide crystals at low temperature and corrugated 2D halide perovskites20212223. In those cases, electron-spin resonance measurements and ab-initio calculations have identified Pb 2 3+ , Pb 3+ and X 2 − (X=Cl, Br) as the potential radiative self-trapped states2425. Figure 3c shows the emission decays at 77 K, with long lifetimes calculated to be 1,443.6 and 1,347.4 ns for the bulk and microscale crystals, respectively.…”

Section: Discussionsupporting

confidence: 57%

“…Besides colour tunable narrow emissions achieved for 2D and 3D perovskites141516171819, broadband white-light emission has been realized recently in corrugated 2D perovskites with photoluminescence quantum efficiency (PLQE) of up to 9%, as a result of exciton self-trapping in the inter-layer inorganic quantum wells2021222324. It has been well known that exciton self-trapping, due to exciton–phonon interaction, is critically dependent on the dimensionality of a crystalline system2526.…”

mentioning

confidence: 99%

One-dimensional organic lead halide perovskites with efficient bluish white-light emission

et al. 2017

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Organic-inorganic hybrid metal halide perovskites, an emerging class of solution processable photoactive materials, welcome a new member with a one-dimensional structure. Herein we report the synthesis, crystal structure and photophysical properties of one-dimensional organic lead bromide perovskites, C4N2H14PbBr4, in which the edge sharing octahedral lead bromide chains [PbBr4 2−]∞ are surrounded by the organic cations C4N2H14 2+ to form the bulk assembly of core-shell quantum wires. This unique one-dimensional structure enables strong quantum confinement with the formation of self-trapped excited states that give efficient bluish white-light emissions with photoluminescence quantum efficiencies of approximately 20% for the bulk single crystals and 12% for the microscale crystals. This work verifies once again that one-dimensional systems are favourable for exciton self-trapping to produce highly efficient below-gap broadband luminescence, and opens up a new route towards superior light emitters based on bulk quantum materials.

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The First 2D Hybrid Perovskite Ferroelectric Showing Broadband White‐Light Emission with High Color Rendering Index

Wang

et al. 2018

Adv Funct Materials

148

113

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Luminescent ferroelectrics have attracted considerable attention in terms of integrated photoelectronic devices, most of which are focused on the multicomponent systems of rare‐earth doping ferroelectric ceramics. However, bulk ferroelectricity with coexistence of strong white‐light emission, especially in the single‐component system, remains quite rare. Here, a new organic–inorganic hybrid ferroelectric of (C4H9NH3)2PbCl4 (1) is reported, adopting a 2D layered perovskite architecture, which exhibits an unprecedented coexistence of notable ferroelectricity and intrinsic white‐light emission. Decent above‐room‐temperature spontaneous polarization of ≈2.1 µC cm−2 is confirmed for 1. Particularly, it also exhibits brilliant broadband white‐light emission with a high color‐rendering‐index up to 86 under UV excitation. Structural analyses indicate that ferroelectricity of 1 originates from molecular reorientation of dynamic organic cations, as well as significant structural distortion of PbCl6 octahedra that also contribute to its white‐light emission. This work paves an avenue to design new hybrid ferroelectrics for multifunctional application in the photoelectronic field.

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Polaron self-localization in white-light emitting hybrid perovskites

Cited by 226 publications

References 67 publications

X-ray Scintillation in Lead Halide Perovskite Crystals

X-ray Scintillation in Lead Halide Perovskite Crystals

One-dimensional organic lead halide perovskites with efficient bluish white-light emission

The First 2D Hybrid Perovskite Ferroelectric Showing Broadband White‐Light Emission with High Color Rendering Index

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