Highly Efficient and Stable CsPbI₃ Perovskite Quantum Dots Light‐Emitting Diodes Through Synergistic Effect of Halide‐Rich Modulation and Lattice Repair

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 20, 2025

Abstract Currently, CsPbI 3 quantum dots (QDs) based light‐emitting diodes (LEDs) are not well suited for achieving high efficiency and operational stability due to the binary‐precursor method purification process, which often results in nonstoichiometric ratio of Cs/Pb/I. This imbalance leads amounts iodine vacancies, inducing severe non‐radiative recombination processes phase transitions QDs. Herein, red‐emitting QDs reported with excellent optoelectronic properties on synergistic effects halide‐rich modulation passivation lattice repair. First, a ternary‐precursor is employed better control feed Cs/Pb/I create environment. Second solvent‐free solid–liquid reaction employing multifunctional guanidinium iodide (GAI) additive used after repair vacancies partially replace surface Cs atoms, thereby effectively modifying its tolerance factor. Additionally, this short‐chain GA + can be as ligand improve conductivity suppress trap‐assisted Auger recombination. Consequently, PeLEDs GAI‐QDs exhibit great maximum external (EQE) 27.1% an half‐lifetime (T 50 ) 1001.1 min at initial luminance 100 cd m −2 .

Language: Английский

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Hybrid Framework Materials: Next‐Generation Engineering Materials

Advanced Engineering Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 10, 2025

Hybrid organic–inorganic materials represent a fascinating class of compounds that combine the unique properties both organic and inorganic materials. This review provides an overview two classes hybrid materials: metal–organic frameworks perovskites, with their structures, applications, responses to external stimuli discussed. These hybrids leverage versatility molecules, for example, flexibility functionality, alongside robustness stability components through coordination between components. By tailoring composition structure, researchers have been able create multifunctional systems exhibit enhanced performance, such as improved mechanical strength, thermal stability, leading innovative applications across various fields, including optoelectronics, gas storage/separation, catalysis. The emerging field glasses is also discussed it represents novel frontier in design materials, combining nature functional With several key areas active research discussed, future framework obstacles must be overcome, synthesis at scale ambient conditions, see widespread modern world, speculated.

Language: Английский

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Exponents of a class of special three-colored primitive digraphs with $ n $ vertices in graph theory

AIMS Mathematics, Journal Year: 2025, Volume and Issue: 10(4), P. 9415 - 9434

Published: Jan. 1, 2025

Language: Английский

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Synergistic Effect of Ligands and Halogen Vacancies for Pure-Red CsPbI₃ Superlattice Light-Emitting Diodes

ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 2341 - 2348

Published: April 16, 2025

Language: Английский

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Strongly-Confined CsPbI₃ Quantum Dots by Surface Cleaning-Induced Ligand Exchange for Spectrally Stable Pure-Red Light-Emitting Diodes with Efficiency Exceeding 26%

ACS Materials Letters, Journal Year: 2024, Volume and Issue: 6(9), P. 4115 - 4123

Published: Aug. 7, 2024

The advancement of pure-red perovskite light-emitting diodes (PeLEDs) is still a challenge because surface "wastes" (like vacancies and excessive insulating ligands) on quantum dots (QDs). Herein, we develop method to synthesize single-halide CsPbI3 QDs, combining strong confinement effect meticulous surface-cleaning-induced ligand exchange. We achieve emitting QDs by controlling the size uniformity under iodide-rich conditions. Subsequently, vacancy defects ligands are cleared through introducing acid. Then this surface-cleaning process induces exchange further inhibit nonradiative recombination improve electrical property QDs. These show photoluminescence (PL) at 635 nm with PL yield (PLQY) 99%. Finally, PeLEDs, which utilize these demonstrate electroluminescence (EL) peak 638 maximum external efficiency (EQE) 26.0% an excellent half-lifetime (T50) 490 min original luminance 102 cd/m2.

Language: Английский

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High-entropy alloy screening for halide perovskites

Materials Horizons, Journal Year: 2024, Volume and Issue: 11(15), P. 3662 - 3694

Published: Jan. 1, 2024

As the concept of high-entropy alloying (HEA) extends beyond metals, new materials screening methods are needed. Halide perovskites (HP) a prime case study because greater stability is needed for photovoltaics applications, and there 322 experimentally observed HP end-members, which leads to more than 1057 potential alloys. We screen HEAHP by first calculating configurational entropy 106 equimolar alloys with end-members. To estimate enthalpy at low computational cost, we turn delta-lattice parameter approach, well-known method predicting III-V alloy miscibility. generalize approach non-cubic crystals, introduce unit cell volume coefficient variation (UCV), does good job experimental miscibility data. use plots stabilization versus UCV promising identify 102 interest.

Language: Английский

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Solvent-Reconstructed Interface That Enhances Light Out-Coupling in Quasi-Two-Dimensional Perovskite Light-Emitting Diodes

Nano Letters, Journal Year: 2024, Volume and Issue: 24(23), P. 7012 - 7018

Published: May 31, 2024

Light management is critical to maximizing the external quantum efficiency of perovskite light-emitting diodes (PeLEDs), but strategies for enhancing light out-coupling are typically complex and expensive. Here, using a facile solvent treatment strategy, we create layer lithium fluoride (LiF) nanoislands that serve as template reconstruct light-extracting interfaces PeLEDs. The nanoisland interface rearranges near-field distribution in order maximize internal extraction. With proper adjustment size distribution, have achieved an optimal balance between charge injection out-coupling, resulting bright, pure-red quasi-two-dimensional PeLEDs with 21.8% peak efficiency.

Language: Английский

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CTAB passivates and stabilizes Cu-doped CsPb(Br/I)3 quantum dots for applications in white-LEDs

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: unknown, P. 178191 - 178191

Published: Dec. 1, 2024

Language: Английский

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Lattice Engineering for Enhancing Stability of CsPbI₃/Cs_xFA_1–xPbI₃ Quantum Dots Synthesized via Direct Arrangement

Materials Chemistry Frontiers, Journal Year: 2024, Volume and Issue: 9(2), P. 288 - 298

Published: Nov. 19, 2024

This study synthesizes CsPbI 3 /Cs x FA 1– PbI QDs using a spontaneous in situ injection method, enhancing stability and efficiency. Our findings highlight the influence of distribution structural factors on optical properties system.

Language: Английский

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High-quality perovskite quantum dots with excellent reproducibility and amplified spontaneous emission by optimization of cesium precursor

Deleted Journal, Journal Year: 2024, Volume and Issue: 5(0), P. 1 - 1

Published: Jan. 1, 2024

Language: Английский

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