Scalable photonic sources using two-dimensional lead halide perovskite superlattices

Jagielski, Jakub; Solari, Simon F.; Jordan, Lucie; Scullion, Declan; Blülle, Balthasar; Li, Yen‐Ting; Krumeich, Frank; Chiu, Yu‐Cheng; Ruhstaller, Beat; Santos, Elton J. G.; Shih, Chih‐Jen

doi:10.1038/s41467-019-14084-3

Cited by 38 publications

(44 citation statements)

References 62 publications

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“…CQWs can also form large nanocrystals through self-assembly (Fig. 4d, right panel) while preserving narrow emission from the CQWs, which is promising for PeLEDs 80,81 .…”

Section: Key Challenges Ahead In Peledsmentioning

confidence: 99%

Metal halide perovskites for light-emitting diodes

et al. 2020

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Metal halide perovskites have shown promising optoelectronic properties suitable for lightemitting applications. The development of perovskite light-emitting diodes (PeLEDs) has progressed rapidly over the past several years, reaching high external quantum efficiencies of over 20%. In this Review, we focus on the key requirements for high-performance PeLEDs, highlight recent advances on materials and devices, and emphasize the importance of reliable characterizations of PeLEDs. We discuss possible approaches to improve the performance of blue and red PeLEDs, increase the long-term operational stability, and reduce toxicity hazards.We also provide an overview of the application space made possible by recent developments of high-efficiency PeLEDs. 3Metal halide perovskites, which have led to great advances in photovoltaic devices, have also proved to be promising candidates for light-emitting diodes (LEDs) 1 . They have shown excellent optoelectronic properties suitable for LEDs, such as high photoluminescence quantum yields (PLQYs), widely tunable bandgap, narrow emission width, and high charge-carrier mobility 2 . Although early reports on perovskite LEDs (PeLEDs) date back to the 1990s 3,4 , room-temperature PeLEDs were not demonstrated until 2014 5 . Since then, benefiting from established experience in both perovskite materials and solution-processed optoelectronic devices, the community has quickly boosted the external quantum efficiencies (EQEs) of PeLEDs to each more than 20% (Box 1) (refs [6][7][8][9][10] ).The rapid development of PeLEDs could lead to a new generation of low-cost and highperformance LEDs for applications including displays, lighting and optical communications 2,11,12 . Compared with other emitters used in commercial devices, such as III-V inorganic semiconductors, organic emitters and conventional colloidal quantum dots (QDs), perovskites have several promising characteristics. Specifically, perovskite emitters with high PLQYs can be straightforwardly fabricated from low-cost precursor solutions, potentially reducing manufacturing costs. Synthesis of colloidal perovskite nanocrystals (PNCs) is also simplified, as PNCs can reach near-unity PLQYs without delicate shell passivation, owing to their unique defect-tolerance nature 13,14 . Furthermore, the optoelectronic properties of perovskite emitters can be readily tailored by engineering composition and dimensionality, enabling continuously tunable light emission from violet to near-infrared (NIR) regions 2,13 . In addition, light emission from perovskites shows narrow linewidths (<100 meV), resulting in high color purity: for example, the photoluminescence full width at half maximum (FWHM) is around 12, 20 and 40 nm for CsPbCl3, CsPbBr3 and CsPbI3 PNCs, respectively 15 . The color gamut of displays made by PNCs can cover up to 140% of the National Television System

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“…CQWs can also form large nanocrystals through self-assembly (Fig. 4d, right panel) while preserving narrow emission from the CQWs, which is promising for PeLEDs 80,81 .…”

Section: Key Challenges Ahead In Peledsmentioning

confidence: 99%

Metal halide perovskites for light-emitting diodes

et al. 2020

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“…We notice that the predicted Θ IP upper limit nicely agrees with the experimentally measured values in 3monolayer LHP NPLs (thickness d = 1.8 nm and AR ~ 30) in which Θ IP = 0.81 -0.85. 41,42 The NC-shape-induced emission directionality is further illustrated in Figs. 1b and 1c, which compare the calculated electric fields and radiation patterns from horizontal and vertical dipoles.…”

Section: Resultsmentioning

confidence: 97%

“…This is reflected by our recent observations that an ultrathin organic spacer of ~0.67 nm is sufficient to decouple neighboring NPLs in their superlattices. 42 We synthesized mixed-cation perovskite NPLs with formula of FA0.5MA0.5PbBr3, where FA = formamidinium, CH3(NH2)2 + and MA = methylammonium, CH3NH3 + , using the modified ligandassisted re-precipitation (LARP) method at room temperature (details see Methods). 45,46 The NPL aspect ratio was tuned and optimized by the ligand concentration and hydrophobicity.…”

Section: Resultsmentioning

confidence: 99%

Two-Dimensional Nanoplatelet Superlattices Overcoming Light Outcoupling Efficiency Limit in Perovskite Quantum Dot Light-Emitting Diodes

Kumar

Marcato

Krumeich³

et al. 2021

Preprint

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Quantum dot (QD) light-emitting diodes (LEDs) are emerging as one of the most promising candidates for next-generation displays. However, their intrinsic light outcoupling efficiency remains considerably lower than the organic counterpart, because it is not yet possible to control the transition-dipole-moment (TDM) orientation in QD solids at device level. Here, using the colloidal lead halide perovskite nanoplatelets (NPLs) as a model system, we report a directed self-assembly approach to form the two-dimensional superlattices (2DSLs) with the out-of-plane vector perpendicular to the substrate plane. The ligand and substrate engineering yields close-packed planar arrays with the side faces linked to each other. Emission polarization in individual NPLs rescales the radiation from horizontal and vertical transition dipoles, effectively resulting in preferentially horizontal TDM orientation. Based on the emissive thin films comprised of stacks of 2D superlattices, we demonstrate an enhanced ratio of horizontal dipole as revealed by 2D k-space spectroscopy. Our optimized single-junction QD LEDs showed peak external quantum efficiency of up to 24% and power efficiency exceeding 110 lm W-1, comparable to state-of-the-art organic LEDs.

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“…Their compact volume could entrap the light field in a tiny region and improve the light-matter interactions. Another interesting report established that QWs of colloidal lead halide perovskites can produce fully decoupled multi-QW (MQW) superlattices (having intralayer local exciton) with ultrathin organic quantum barriers (Jagielski et al, 2020), same as the addition of monolayer hybrid BN (h-BN). The obtained result demonstrates that photonic sources have emission of narrowband, high quantum yield, improved light outcoupling, and wavelength tenability useful for nano-antennas (near field) and LEDs (far field).…”

Section: Distinctive Spectroscopic Characteristics: a Route To Device Functionalitymentioning

confidence: 99%

A Microstructural Analysis of 2D Halide Perovskites: Stability and Functionality

Bhattacharya

Chandra

Predeep

2021

Front. Nanotechnol.

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Recent observations have demonstrated that the photoelectric conversion properties of perovskite materials are intimately related to the presence of superlattice structures and other unusual nanoscale features in them. The low-dimensional or mixed-dimensional halide perovskite families are found to be more efficient materials for device application than three-dimensional halide perovskites. The emergence of perovskite solar cells has revolutionized the solar cell industry because of their flexible architecture and rapidly increased efficiency. Tuning the dielectric constant and charge separation are the main objectives in designing a photovoltaic device that can be explored using the two-dimensional perovskite family. Thus, revisiting the fundamental properties of perovskite crystals could reveal further possibilities for recognizing these improvements toward device functionality. In this context, this review discusses the material properties of two-dimensional halide perovskites and related optoelectronic devices, aiming particularly for solar cell applications.

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Scalable photonic sources using two-dimensional lead halide perovskite superlattices

Cited by 38 publications

References 62 publications

Metal halide perovskites for light-emitting diodes

Metal halide perovskites for light-emitting diodes

Two-Dimensional Nanoplatelet Superlattices Overcoming Light Outcoupling Efficiency Limit in Perovskite Quantum Dot Light-Emitting Diodes

A Microstructural Analysis of 2D Halide Perovskites: Stability and Functionality

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