Long Range Energy Transfer in Self-Assembled Stacks of Semiconducting Nanoplatelets

Liu, Jiawen; Guillemeney, Lilian; Abécassis, Benjamin; Coolen, Laurent

doi:10.1021/acs.nanolett.0c00376

Cited by 38 publications

(67 citation statements)

References 36 publications

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“…Figure S12b in the Supporting Information demonstrates that the emission from the top layer at 650 nm is intense in the absence of a separator (red) but weak for large separations (20 nm, black) (Figure S12b, Supporting Information). As expected for LR-FRET, [37,38,45,46] the energy transfer occurs over rather far distances of >10 nm, which are substantially longer than those in normal FRET processes (see Figure S11, Supporting Information, showing fluorescence life-time quenching for the c-HL sample).…”

Section: Resultssupporting

confidence: 59%

Antenna Doping: The Key for Achieving Efficient Optical Wavelength Conversion in Crystalline Chromophoric Heterolayers

Haldar

Chen

Mazel

et al. 2021

Adv Materials Inter

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For efficient light absorption, a huge variety of dyes is available, both from nature [2] as well as from organic synthesis, with many of them relying on extended π-conjugated structures. [3,4] To avoid reemission, the energy stored in the form of electronic excitations must be transported to regions in space where it can be converted into another form of energy, either chemical or electrical. In mesoscale assemblies, this exciton transport [5] is often inefficient, since abundant unwanted interchromophore interactions lead to nonradiative deactivation or fluorescence quenching. Some of the commonly encountered loss processes result from H-type aggregate formation, structural defects, unwanted electron transfer (charge separation), etc. [6,7] In order to avoid such losses upon energy transfer, high-purity and structurally perfect structures are required. Furthermore, established device architectures require a directional transport of excitons, as isotropic processes will greatly reduce device performance. [8] The most efficient transfer mechanism for singlet excitons is Förster resonance energy transfer (FRET). This mechanism allows the straightforward realization of a wavelength converter together with directional energy transport by arranging suitable donor-acceptor (D-A) pairs into a chain, e.g., consisting of three different chromophores C1, C2, and C3 as illustrated in Figure 1a. If the emission of C1 and the absorption of C2, as well as the emission of C2 and the absorption of C3, show sufficient spectral overlap, efficient FRET will cause the trimer to function as a two-step cascade in which the directed energy conversion of photons is absorbed in C1 via C2 to C3 (Figure 1a,b).On the molecular level, a variety of organic synthesis schemes for the fabrication of such cascades have been reported, with most of them based on sophisticated coupling chemistry using suitable building blocks. [9] However, for integration into organic photovoltaic (OPV) devices, mesoscopic assemblies providing transport on a macroscopic scale are mandatory. [10] While a number of approaches have been presented to fabricate such chromophoric aggregates, e.g., based on zeolites, [11] solvated molecules, gels (randomly oriented), or dendritic systems, [12][13][14][15][16] only a few of these strategies are compatible with contemporary OPV device architectures. Moreover, most of these previously High-yield wavelength conversion is one of the key requirements for efficient photon energy harvesting. Attempts to realize efficient conversion by simply stacking layers of chromophores have failed so far, even when using highly crystalline assemblies and employing the recently discovered long-range (>100 nm) Förster resonance energy transfer (LR-FRET). Optical conversion efficiency is drastically improved using chromophoric metal-organic framework heterolayers fabricated layer-by-layer in connection with an "antenna doping" strategy. Systematic investigations reveal that the LR-FRET mechanism, reported previously in chromophoric aggregates, i...

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Section: Resultssupporting

confidence: 59%

Antenna Doping: The Key for Achieving Efficient Optical Wavelength Conversion in Crystalline Chromophoric Heterolayers

Haldar

Chen

Mazel

et al. 2021

Adv Materials Inter

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“…[26][27][28] However, while interlayer transfer of charge carriers is inefficient, excitons can potentially transfer efficiently from one layer to another through dipole-dipole coupling. [29][30][31] Dipole-dipole coupling in layered perovskites is expected to be particularly strong as these materials exhibit large oscillator strengths (> 10 Debye) and favorable dipole alignment. 32 To date, energy transfer studies in 2D perovskites have been focused exclusively on films of mixed dimensionality, studying the transfer between phases of distinct layer thickness (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…47 Finally, we have shown that the origin of this ultrafast timescale lies beyond conventional Forster theory, and adds to similar observations of energy transfer in other 2D systems. 30,48 Further studies will be needed to elaborate the details of the underlying physics.…”

Section: Introductionmentioning

confidence: 99%

Efficient interlayer exciton transport in two-dimensional metal-halide perovskites

et al. 2021

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“…For example, columnar self‐assembled NPLs emit polarized light due to the dominant presence of in‐plane transition dipole orientations. [ 41 ] Due to the close distance between neighboring NPLs in the stacked films, the observation of ultrafast fluorescence resonance energy transfer (FRET) was uncovered by several groups, [ 44–49 ] which also leads to accelerated nonradiative Auger recombination (AR) processes accounting for the more efficient exciton trapping by nonemissive trapped NPLs during carrier transfer. Until then, only edge‐up orientation of assembled CdSe NPLs with peripheral side contact with the substrate had been accomplished.…”

Section: Introductionmentioning

confidence: 99%

Manipulation of the Optical Properties of Colloidal 2D CdSe Nanoplatelets

Zhang

Sun

2021

Advanced Photonics Research

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Driven by the unique optoelectronic features arising from the strong quantum confinement along the thickness direction, rapid development of CdSe‐based nanoplatelets (NPL) has accomplished facile bandgap tunability over a broad spectrum via different preparation protocols or various postsynthesis treatments. The anisotropic geometry of NPLs also stimulates the exploitation of self‐assembled CdSe NPL superstructures to enhance light extraction efficiency in display technologies and achieves polarized lasing performance or even electrically pumped laser by adjusting the transition dipole orientation. Although several review articles about the general optical properties of CdSe NPLs have been published, none of them focus on the ability of spectral tunability and precise control of orientations in the solid‐state phase of CdSe NPLs. Herein, the band structure engineering approaches in the CdSe NPL family are systematically summarized and the optical properties and device performance metrics of these deliberately engineered NPLs are compared. Then, the recent advanced studies of the motivation and assembly methods of geometrically anisotropic CdSe NPL superlattices are discussed. Finally, the current challenges and future outlook on the controlled modification of optical features and the influences of the approaches in the aspect of CdSe NPL–based devices’ performance are highlighted.

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Long Range Energy Transfer in Self-Assembled Stacks of Semiconducting Nanoplatelets

Cited by 38 publications

References 36 publications

Antenna Doping: The Key for Achieving Efficient Optical Wavelength Conversion in Crystalline Chromophoric Heterolayers

Antenna Doping: The Key for Achieving Efficient Optical Wavelength Conversion in Crystalline Chromophoric Heterolayers

Efficient interlayer exciton transport in two-dimensional metal-halide perovskites

Manipulation of the Optical Properties of Colloidal 2D CdSe Nanoplatelets

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