Advances in the Application of Perovskite Materials

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: July 10, 2023

Nowadays, the soar of photovoltaic performance perovskite solar cells has set off a fever in study metal halide materials. The excellent optoelectronic properties and defect tolerance feature allow to be employed wide variety applications. This article provides holistic review over current progress future prospects materials representative promising applications, including traditional devices (solar cells, light-emitting diodes, photodetectors, lasers), cutting-edge technologies terms neuromorphic (artificial synapses memristors) pressure-induced emission. highlights fundamentals, remaining challenges for each application, aiming provide comprehensive overview development status navigation research devices.

Language: Английский

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Suppressing Auger Recombination of Perovskite Quantum Dots for Efficient Pure-Blue-Light-Emitting Diodes

ACS Energy Letters, Journal Year: 2022, Volume and Issue: 8(1), P. 731 - 739

Published: Dec. 28, 2022

It is a big challenge to achieve pure-blue (≤470 nm) perovskite light-emitting diodes (PeLEDs) with high efficiency and stability. Here, we report (electroluminescence at 469 PeLEDs full width half-maximum of 21 nm, external quantum 10.3%, luminance 12 060 cd m–2, continuous operation half-life 25 h, representing the state-of-the-art performance. This design based on strongly confined CsPbBr3 dots (QDs) suppression Auger recombination, which was enabled by inorganic ligands, replacing initial organic ligands QDs. The ligand acts as "capacitor" alleviate charge accumulation reduce exciton binding energy QDs, suppresses resulting in much lower roll-off PeLEDs. Thus, devices maintain (>10%) (>2000 m–2), considerable significance for display application.

Language: Английский

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A Multifunctional Additive Strategy Enables Efficient Pure‐Blue Perovskite Light‐Emitting Diodes

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(35)

Published: May 11, 2023

Lead halide perovskites have shown exceptional performance in light-emitting devices (PeLEDs), particularly producing significant electroluminescence sky-blue to near-infrared wavelengths. However, PeLEDs emitting pure-blue light at 465-475 nm are still not satisfactory. Herein, efficient and stable reported by controlling phase distribution, passivation of defects, as well surface modifications using multifunctional phenylethylammonium trifluoroacetate (PEATFA) reduced-dimensional p-F-PEA2 Csn-1 Pbn (Br0.55 Cl0.45 )3n+1 polycrystalline perovskite films. Compared with 4-fluorophenylethylammonium (p-F-PEA+ ) the pristine films, (PEA+ has lower adsorption energy while interacting perovskites, resulting large-n low-dimensional which can greatly facilitate charge transport within The interaction between CO group (TFA- significantly reduces defects Additionally, electron-giving CF3 TFA- uplifts potential smooth electronic injection devices. additive strategy leads elevated radiative recombination carrier films As a result, exhibit maximum external quantum efficiency (EQE) 11.87% 468 spectral output, highest date for PeLEDs. Thus, this study extends way high-efficiency LED polycrystal

Language: Английский

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Charge injection engineering at organic/inorganic heterointerfaces for high-efficiency and fast-response perovskite light-emitting diodes

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Oct. 13, 2023

The development of advanced perovskite emitters has considerably improved the performance light-emitting diodes (LEDs). However, further LEDs requires ideal device electrical properties, which strongly depend on its interfaces. In with conventional p-i-n structures, hole injection is generally less efficient than electron injection, causing charge imbalance. Furthermore, popular structure NiOx/poly(9-vinylcarbazole) suffers from several issues, such as weak interfacial adhesion, high trap density and mismatched energy levels. this work, we insert a self-assembled monolayer [2-(9H-carbazol-9-yl)ethyl]phosphonic acid between NiOx poly(9-vinylcarbazole) layers to overcome these challenges at organic/inorganic heterointerfaces by establishing robust interface, passivating states aligning We successfully demonstrate blue (emission 493 nm) green 515 devices external quantum efficiencies 14.5% 26.0%, respectively. More importantly, also gives rise much faster response speeds reducing capacitance resistance. Our results pave way for developing more brighter quick response, widening their potential application scope.

Language: Английский

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Balancing Charge Injection via a Tailor-Made Electron-Transporting Material for High Performance Blue Perovskite QLEDs

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(1), P. 818 - 826

Published: Jan. 3, 2023

One of the great challenges in perovskite quantum dot light-emitting diodes (Pe-QLEDs) is unbalanced charge injection that significantly hinders device performance and stability. Herein, we tailor-made a high mobility electron-transporting material (ETM), named B2, to balance carrier blue Pe-QLEDs. B2 with tailored asymmetric anthracenyl structure exhibits promising electron 2.7 × 10–4 cm2·V–1·s–1, which almost 20 times higher than commonly used ETM-TPBi (1.1 10–5 cm2·V–1·s–1). Subsequently, sky (490 nm) Pe-QLED as ETM presented remarkably external efficiency (EQE) 13.17% low turn-on voltage 2.2 V, much better TPBi-based (EQE 8.31% Vturn-on 3.2 V). In addition, also demonstrated universal application green deep This work provides an important guidance rational design ETMs for high-performance LEDs.

Language: Английский

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High Color-Purity and Efficient Pure-Blue Perovskite Light-Emitting Diodes Based on Strongly Confined Monodispersed Quantum Dots

Nano Letters, Journal Year: 2023, Volume and Issue: 23(6), P. 2405 - 2411

Published: March 7, 2023

Here, we develop an in situ photoluminescence (PL) system to monitor the nucleation and growth of perovskite nanocrystals control monomer supply rate achieve strongly confined monodispersed quantum dots (QDs) with average size 3.4 nm. Pure-blue (460 nm wavelength) CsPbBr3 QDs near unity PL yield narrow distribution (small dispersion 9.6%) were thus produced. Light-emitting diodes (LEDs) based on these prepared by using all-solution processing route, which showed electroluminescence full width at half-maximum 20 a high color purity 97.3%. The device also had external efficiency 10.1%, maximum luminance 11 610 cd m-2, continuous operation lifetime 21 h initial 102 corresponding state-of-art for pure-blue LEDs.

Language: Английский

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Water‐Driven Synthesis of Deep‐Blue Perovskite Colloidal Quantum Wells for Electroluminescent Devices

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(12)

Published: Jan. 24, 2023

Perovskite colloidal quantum wells (QWs) are promising to realize narrow deep-blue emission, but the poor optical performance and stability suppress their practical application. Here, we creatively propose a water-driven synthesis strategy obtain size-homogenized strongly confined CsPbBr3 QWs, corresponding three monolayers, which emit at wavelength of 456 nm. The water controls orientation distribution ligands on surface nanocrystals, thus inducing orientated growth through Ostwald ripening process by phagocytizing unstable nanocrystals form well-crystallized QWs. These QWs present remarkable high photoluminescence yield 94 %. Furthermore, have prepared light-emitting diodes based via all-solution fabrication strategy, achieving an external efficiency 1 % luminance 2946 cd m-2 , demonstrating state-of-the-art brightness for perovskite QW-based LEDs.

Language: Английский

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Perovskite Quantum Dots for the Next‐Generation Displays: Progress and Prospect

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(36)

Published: March 5, 2024

Abstract The “Nobel Prize in Chemistry 2023” is awarded to Moungi G. Bawendi, Louis E. Brus, and Alexey I. Yekimov for discovering synthesizing Quantum Dots (QDs). Colloidal QDs possess fascinating size‐, morphological‐, composition‐, assembly‐tunable electronic optical properties, which makes them star materials various optoelectronic applications, especially as luminescent next‐generation wide color gamut ultra‐high‐definition displays. Perovskite (PQDs) have gained widespread attention recent years. In less than ten years, research on perovskite‐related devices has basically been perfected terms of quantum yield external efficiency (EQE). However, the eve its industrial application, some key technical indicators processes need be met resolved. development transformation QD then focuses progress luminescence linewidth EQE PQD light‐emitting diode. Finally, several application avenues are reviewed PQDs, challenges opportunities field proposed.

Language: Английский

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Eliminating Chlorine Vacancies of Perovskite Nanocrystals Using Hydrazine Cations Enables Efficient Pure Blue Light-Emitting Diodes

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(3), P. 1210 - 1218

Published: Feb. 26, 2024

Mixed Br/Cl-perovskite nanocrystals (Pe-NCs) CsPbBrxCl3–x, synthesized at room temperature (RT), offer several advantages for use in light-emitting diodes (LEDs), including cost-effective processing and a narrow luminescence peak. However, achieving efficient pure blue LEDs using CsPbBrxCl3–x NCs has been proven to be challenging due significant number of chlorine defects. In this work, we propose passivation strategy utilizing hydrazine cations (Hz2+) eliminate defects RT-synthesized Pe-NCs. Our investigation reveals that Hz2+ can capture the isolated anion (Cl–) form Hz–Cl–Cs bridge on Pe-NC surface, thereby effectively inhibiting formation vacancies. This approach significantly enhances both photoluminescence efficiency lifetime Consequently, fabricated Hz2+-passivated Pe-NCs achieve an outstanding external quantum (EQE) 7.82% 475 nm. findings highlight effective mitigates Pe-NCs, advancing development LEDs.

Language: Английский

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Near‐Unity Quantum Yield ZnSeTe Quantum Dots Enabled by Controlling Shell Growth for Efficient Deep‐Blue Light‐Emitting Diodes

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(24)

Published: Feb. 21, 2024

Abstract Core–shell structural ZnSeTe/ZnSe/ZnS quantum dots (QDs) have attracted great attention for advanced illumination and displays because of their environmentally friendly composition, but still suffering from poor photoluminescence (PL) electroluminescence (EL) performance due to severe non‐radiative charge recombination. Herein, a stepwise injection shell growth process manipulate the monomer concentration ensure adequate interval is devised, which enables controllable uniform epitaxial ZnSe ZnS shells on ZnSeTe core, thus relieving lattice distortion defects greatly suppress The QDs presented deep‐blue emission at 448 nm with narrow full width half maximum (FWHM, 23 nm), near‐unity PL yield (PLQY, ≈100%) light‐emitting diodes (LEDs) based exhibited high external efficiency (EQE) 10.9%, brightness 10240 cd cm −2 , current 7.9 A −1 demonstrating good deep blue LEDs (QLEDs) This strategy will be an effective approach achieving efficient QLEDs.

Language: Английский

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