Aggregation-induced emission in lamellar solids of colloidal perovskite quantum wells

Jagielski, Jakub; Kumar, Sudhir; Wang, Mingchao; Scullion, Declan; Lawrence, R. A.; Li, Yen‐Ting; Yakunin, Sergii; Tian, Tian; Kovalenko, Maksym V.; Chiu, Yu‐Cheng; Santos, Elton J. G.; Lin, Shangchao; Shih, Chih‐Jen

doi:10.1126/sciadv.aaq0208

Cited by 72 publications

(68 citation statements)

References 70 publications

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“…This special property allows to obtain equally or even higher PLQY values compared with those when the quantum dots are dispersed in solution. After forming the self‐assembled structures, the PLQY increases considerably by 5% to 20% . This observation suggests that (a) the nonradiative losses during interparticle energy transfer are minimal, or the self‐quenching is negligible, and (b) the interparticle energy transfer efficiency is near unity.…”

Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 97%

“…This observation is attributed to aggregation‐induced emission (AIE) phenomena. Here, we describe the formation of lamellar solids of colloidal quantum wells (CQWs) of perovskites, which exhibit the above‐mentioned AIE phenomena …”

Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 99%

“…Figure schematically shows the superlattice structure of a lamellar solid and its molecular structure. In this case, the stacking parameter is n = 3, which means that each CQW nanocrystal is consisted of three unit cell monolayers . We report the facile colloidal synthesis of MAPbBr 3 perovskite quantum wells with different thicknesses according to their stacking parameter n .…”

Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 99%

“…Structure of lamellar solids showing layer‐controlled quantum wells between long alkyl ligands. Adapted from Jagielski et al…”

Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 99%

“…PLQY of MAPbBr 3 dispersions, lamellar solids, and drop‐casted films as a function of the stacking parameter n . Adapted from Jagielski et al…”

Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 99%

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Monochromatic LEDs based on perovskite quantum dots: Opportunities and challenges

et al. 2019

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Perovskite quantum dots (QDs) are emerging as one of the most promising candidates for the monochromatic light‐emitting diodes (LEDs) approaching the Rec. 2020 color gamut due to their extremely narrow emission bandwidth. Another important aspect are the high photoluminescence quantum yield (PLQY) values that can be obtained either in solution or thin films making these materials as promising candidates for optoelectronic applications such as LEDs or solar cells. Considerable research efforts in chemistry, chemical engineering, solid‐state physics, and material sciences have been made in the past years. The new opportunity in the field of semiconductor quantum dots is still in the beginning phase and is expected to remain active in the following years. Here, in this invited commentary, we briefly discuss and summarize the opportunities and challenges in both fundamental and technological aspects, based on our work and the recent work in this field.

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Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 97%

Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 99%

Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 99%

“…Structure of lamellar solids showing layer‐controlled quantum wells between long alkyl ligands. Adapted from Jagielski et al…”

Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 99%

“…PLQY of MAPbBr 3 dispersions, lamellar solids, and drop‐casted films as a function of the stacking parameter n . Adapted from Jagielski et al…”

Section: Bright Luminescence and High Quantum Yields In Perovskite Ncsmentioning

confidence: 99%

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Monochromatic LEDs based on perovskite quantum dots: Opportunities and challenges

et al. 2019

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Domain‐Size‐Dependent Residual Stress Governs the Phase‐Transition and Photoluminescence Behavior of Methylammonium Lead Iodide

Lee

Türedi

Giugni

et al. 2021

Adv Funct Materials

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Methylammonium lead iodide (MAPbI3) perovskite has garnered significant interest as a versatile material for optoelectronic applications. The temperature‐dependent photoluminescence (TDPL) and phase‐transition behaviors revealed in previous studies have become standard indicators of defects, stability, charge carrier dynamics, and device performance. However, published reports abound with examples of irregular photoluminescence and phase‐transition phenomena that are difficult to reconcile, posing major challenges in the correlation of those properties with the actual material state or with the subsequent device performance. In this paper, a unifying explanation for the seemingly inconsistent TDPL and phase‐transition (orthorhombic‐to‐tetragonal) characteristics observed for MAPbI3 is presented. By investigating MAPbI3 perovskites with varying crystalline states, ranging from polycrystal to highly oriented crystal as well as single‐crystals, key features in the TDPL and phase‐transition behaviors are identified that are related to the extent of crystal domain‐size‐dependent residual stress and stem from the considerable volume difference (ΔV ≈ 4.5%) between the primitive unit cells of the orthorhombic (at 80 K) and tetragonal phases (at 300 K) of MAPbI3. This fundamental connection is essential for understanding the photophysics and material processing of soft perovskites.

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Inorganic and Layered Perovskites for Optoelectronic Devices

et al. 2019

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Organic-inorganic halide perovskites are making breakthroughs in a range of optoelectronic devices. Reports of >23% certified power conversion efficiency in photovoltaic devices, external quantum efficiency >21% in light-emitting diodes (LEDs), continuous-wave lasing and ultralow lasing thresholds in optically pumped lasers, and detectivity in photodetectors on a par with commercial GaAs rivals are being witnessed, making them the fastest ever emerging material technology. Still, questions on their toxicity and long-term stability raise concerns toward their market entry. The intrinsic instability in these materials arises due to the organic cation, typically the volatile methylamine (MA), which contributes to hysteresis in the current-voltage characteristics and ion migration. Alternative inorganic substitutes to MA, such as cesium, and large organic cations that lead to a layered structure, enhance structural as well as device operational stability. These perovskites also provide a high exciton binding energy that is a prerequisite to enhance radiative emission yield in LEDs. The incorporation of inorganic and layered perovskites, in the form of polycrystalline films or as single-crystalline nanostructure morphologies, is now leading to the demonstration of stable devices with excellent performance parameters. Herein, key developments made in various optoelectronic devices using these perovskites are summarized and an outlook toward stable yet efficient devices is presented.

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Aggregation-induced emission in lamellar solids of colloidal perovskite quantum wells

Abstract: The first low-dimensional semiconductor nanocrystal system that increases the photoluminescence quantum yield in aggregates.

Cited by 72 publications

References 70 publications

Monochromatic LEDs based on perovskite quantum dots: Opportunities and challenges

Monochromatic LEDs based on perovskite quantum dots: Opportunities and challenges

Domain‐Size‐Dependent Residual Stress Governs the Phase‐Transition and Photoluminescence Behavior of Methylammonium Lead Iodide

Inorganic and Layered Perovskites for Optoelectronic Devices

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