2D/3D Heterostructured Perovskites for Highly Selective Room-Temperature Blue Spin-Polarized Light-Emitting Diodes DOI Creative Commons
Jooho Moon, Gyumin Jang,

Sangjun Lee

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 31, 2024

Abstract Circularly polarized light can be utilized in numerous applications, including 3D displays and magnetic memory. In this study, pure-blue spin-polarized light-emitting diodes (spin-LEDs) were fabricated by depositing chirality-induced spin selectivity (CISS) layers—2D perovskites incorporating R/S-2-fluoromethylbenzylamine (R/S-2F-MBA) chiral cations—on top of Br/Cl mixed-halide perovskite thin films. The chiroptical properties these heterostructured significantly improved, as reflected an approximately six-fold increase circular dichroism over a conventional iodide perovskite. Density functional theory calculations indicated that the ionic radius halogen atom decreased relative to iodine, hydrogen bonding between ammonium groups cations halide anions inorganic slabs became stronger; facilitated chirality transfer from 2F-MBA amplified structural distortion. Halogen–halogen interactions contributed further transfer, improving spin-polarizability CISS layer. enhanced effect yielded spin-LEDs with circularly electroluminescence dissymmetry factor exceeding 10%. Additionally, highly polar R/S-2F-MBA effectively passivated vacancies film, boosting luminescence well external quantum efficiency. As preliminary proof concept, employed vertical-type photodetectors, enabling interactive optical wireless communication.

Language: Английский

Green Spin Light-Emitting Diodes Enabled by Perovskite Nanocrystals in Situ Modified with Chiral Ligands DOI Creative Commons
Desui Chen, Bing Tang, Aleksandr A. Sergeev

et al.

ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 815 - 821

Published: Jan. 15, 2025

Spin-polarized light-emitting diodes (spin-LEDs) hold promise for next-generation technologies across optical communication, biological imaging, and quantum information processing. Chiral metal halide perovskites, which combine advantageous optoelectronic properties with chirality, are promising materials high-performance spin-LEDs. However, such spin-LEDs still suffer from low efficiency limited brightness, as they often rely on low-dimensional chiral perovskites rather inferior charge-transport spin filter layers. Herein, we demonstrate bright efficient green based perovskite nanocrystals emitters. We employed an in situ ligand modification using R-/S-1-(4-bromophenyl)-ethylammonium bromide to imprint chirality onto CsPbBr3 nanocrystals, exhibited both a high photoluminescence yield of 89% improved relaxation lifetime. A remarkable spin-polarization 88% was observed the nanocrystal films. Consequently, our without commonly used layer simultaneously achieved maximum brightness 12,800 cd m–2, record-high peak external 15.4%, circularly polarized electroluminescence dissymmetry factor 2.16 × 10–3 at room temperature, setting new benchmarks perovskite-based

Language: Английский

Citations

3
Quantification of Chirality Induced Spin–Orbit Coupling for Long Spin Polarized Lifetime in Hybrid Perovskite DOI
Yuling Huang,

Zhikang Jiang,

Congcong Chen

et al.

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: 16(9), P. 2378 - 2384

Published: Feb. 26, 2025

Long spin lifetimes are crucial for maintaining robust states during propagation in spintronic devices. Spin-orbit coupling (SOC) chiral hybrid perovskites can induce chirality-dependent splitting, facilitating the manipulation of polarization. In this study, we introduce a organic molecule, (R/S)-4-(aminoethyl)piperidinium (4AEP), into iodide-lead-based structures to synthesize [(R/S)-4AEP]PbI4 crystals and thin films. Using circularly polarized pump-probe techniques, examine carrier dynamics [(R/S)-4AEP]PbI4. Our results demonstrate that chirality-induced splitting significantly enhances spin-polarization lifetime, achieving approximately 130 meV at valence band maximum exceeding 1 ns. Density functional theory (DFT) calculations reveal opposite exist R- S-chiral samples with substantial splitting. These findings highlight potential spintronics applications.

Language: Английский

Citations

2
Perovskite spin light-emitting diodes with simultaneously high electroluminescence dissymmetry and high external quantum efficiency DOI Creative Commons
Shuai He, Weixi Lin,

De Yu

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 5, 2025

Realizing high electroluminescence dissymmetric factor and external quantum efficiency at the same time is challenging in light-emitting diodes with direct circularly polarized emission. Here, we show that can be simultaneously achieved based on chiral perovskite dots. Specifically, dots chiral-induced spin selectivity concurrently serve as localized radiative recombination centers of spin-polarized carriers for emission, thereby suppressing relaxation spins, Meanwhile, improving ligand exchange found to synergistically promote their optoelectronic properties so chiroptoelectronic performance resulting devices facilitated. Our device exhibits (R: 0.285 S: 0.251) 16.8% 16%), demonstrating potential constructing high-performance light sources.

Language: Английский

Citations

2
Additive‐Driven Enhancement of Crystallization: Strategies and Prospects for Boosting Photoluminescence Quantum Yields in Halide Perovskite Films for Light‐Emitting Diodes DOI Open Access

Shiheng Wang,

Xianglong Sun,

Jiantao Shi

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 6, 2024

Abstract Halide perovskite light‐emitting diodes (PeLEDs) hold great potential for applications in displays and lighting. To enhance the external quantum efficiency (EQE) of PeLEDs, it is crucial to boost photoluminescence yield (PLQY) films. The use additives has emerged as a powerful chemical strategy control crystallization process solution‐processed different types that can be used reflect various interactions with materials, influencing their possible ways. Understanding relationship between these impact on key step designing emitters improved PLQY devices superior EQE. Following logic chain additive–perovskite interactions, impacts crystallization, subsequent enhancement EQE, this review discusses how play pivotal role Furthermore, assessment addresses open challenges outlines future prospects development PeLEDs.

Language: Английский

Citations

8
Chiral 2D and quasi-2D hybrid organic inorganic perovskites: from fundamentals to applications DOI Creative Commons
Marco Moroni,

Clarissa Coccia,

Lorenzo Malavasi

et al.

Chemical Communications, Journal Year: 2024, Volume and Issue: 60(70), P. 9310 - 9327

Published: Jan. 1, 2024

Chiral 2D and quasi-2D hybrid organic-inorganic perovskites (HOIPs) are emerging as promising materials for a variety of applications principally related to optoelectronics spintronics, thanks the combined benefits deriving from both chiral cation perovskite structure. Since its recent birth, this research field is tremendously growing, focalizing on chemical composition tuning unveil influence functional properties well developing devices practical applications. In review, we focused HOIPs, firstly providing an overview their chiroptical behaviour followed by potential exploitation in investigated so far various applicative fields.

Language: Английский

Citations

7
Spontaneous Formation of Single-Crystalline Spherulites in a Chiral 2D Hybrid Perovskite DOI
Shunran Li, Du Chen, Bowen Li

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 21, 2025

In two-dimensional (2D) chiral metal-halide perovskites (MHPs), organic spacers induce structural chirality and chiroptical properties in the sublattice. This enables reversible crystalline-glass phase transitions (S-NEA)2PbBr4, a prototypical 2D MHP where NEA+ represents 1-(1-naphthyl)ethylammonium. Here, we investigate two distinct spherulite states of exhibiting either radial-like or stripe-like banded patterns depending on annealing conditions amorphous film. Despite similarities optical absorption photoluminescence, stripe-like, exhibits higher crystallinity improved transparency compared to those spherulite. X-ray nanoprobe measurements reveal tilting-angle modulations octahedral plane spherulites, correlating with film's surface geometry. Transfer matrix calculations indicate that contrast patterns, seen bright-field microscopy, arises from interference effects, differing mechanism observed polymer spherulites. Ultrafast carrier dynamics experiments suggest spherulites resemble single crystals more closely than while electrical conductivity show enhanced charge transport These findings offer insights into composition but different morphologies, previously only polymers, highlighting their potential for optoelectronic applications.

Language: Английский

Citations

1
Efficient Spin‐Light‐Emitting Diodes With Tunable Red to Near‐Infrared Emission at Room Temperature DOI Creative Commons
Jingwen Yao, Yuling Huang, Haifeng Sun

et al.

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

Published: Jan. 29, 2025

Abstract Spin light‐emitting diodes (spin‐LEDs) are important for spin‐based electronic circuits as they convert the carrier spin information to optical polarization. Recently, chiral‐induced selectivity (CISS) has emerged a new paradigm enable spin‐LED it does not require any magnetic components and operates at room temperature. However, CISS‐enabled with tunable wavelengths ranging from red near‐infrared (NIR) yet be demonstrated. Here, chiral quasi‐2D perovskites developed fabricate efficient spin‐LEDs NIR region by tuning halide composition. The optimized perovskite films exhibit circularly polarized luminescence 675 788 nm, photoluminescence quantum yield (PLQY) exceeding 86% dissymmetry factor ( g lum ) 8.5 × 10 −3 2.6 −2 . More importantly, direct electroluminescence (CPEL) is achieved temperature in spin‐LEDs. This work demonstrated highest external efficiency (EQE) reaching 12.4% (EL) factors EL 3.7 1.48 composition‐dependent CPEL performance further attributed prolonged lifetime revealed ultrafast transient absorption spectroscopy.

Language: Английский

Citations

1
High‐Performance Sky‐Blue Perovskite Spin‐Light Emitting Diodes Due to Chiral Ionic Liquid Implantation and Passivation DOI Open Access
Guoshuai Zhang, Jun Tang, Yang Li

et al.

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

Published: March 3, 2025

Abstract In chiral hybrid perovskites (CHPs), the generation of polarized spin current and manipulation exciton recombination are expected to produce circularly electroluminescence (CP‐EL) through chiral‐induced selectivity (CISS). It opens a new avenue for developing single junction light‐emitting diodes (spin‐LEDs). The recent challenge lies primarily in balancing device performance CP‐EL polarization. Beyond this, blue spin‐LEDs have not been fully realized. lacks studies interior spin‐chiroptical properties. Herein, promising chirality transfer methodology is initiated fabricating sky‐blue (≈491 nm) using synthesized ionic liquids (CILs). They on one side yield material passivation, giving rise chiroptical (EL) An optimal external quantum efficiency (EQE) 13.0% with dissymmetry factor 0.158 obtained. Importantly, this method leads elevation orbit coupling (CISOC) strength up 0.9717 eV A, long decay lifetime over 1 ns A large approximately 75% achieved ambient conditions. This work unlocks spin‐LEDs, further construction spin‐chiroptics relationship.

Language: Английский

Citations

1
Unraveling Chiral Perovskite Spin‐Light Emitting Diode Performance and Magneto‐Chiroptical Properties Relationship Due to the Synergistic Effect DOI Open Access
Yang Li,

Linze Jiang,

Jun Tang

et al.

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

Published: March 23, 2025

Abstract Chiral hybrid perovskites (CHPs) are very promising for room temperature spin‐light emitting diodes (spin‐LEDs) because of the chiral‐induced spin orbit coupling (CISOC) and helicity‐dependent carrier transport. The chiral‐achiral synergistic method has been recognized as a critical successful pathway developing high‐performance spin‐LEDs. Nonetheless, it remains an absence any studies to demonstrate elucidate relationship between chiral perovskite spin‐LEDs’ performance magneto‐chiroptical properties. Herein, spin‐LEDs being designed fabricated using method. A combination experimental theoretical study is performed systematically toward understanding spin‐related chiroptical properties, instance, lifetimes, CISOC strengths, magnetic transition dipole moments. To tune organic constituent found be decisive degrees circularly polarized electroluminescence (CP‐EL) properties CHPs. This insightful study, first time, unlocks correlation spin‐dependent due effect.

Language: Английский

Citations

1
Mixed‐Ligand Chiral Quasi‐2D Perovskites for Standard and Deep Blue CP‐LEDs DOI

Xinyao Yan,

Rui Cao,

Ruxi Zhang

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 7, 2024

Abstract This study presents the development of mixed‐ligand quasi‐2D perovskites ((2‐PEA) x ( R/S ‐2‐BA) 2 MA 1 Cs Pb 3 Br 10+ , = 0.8, 1.6, 2.4) for circularly polarized light‐emitting diodes (CP‐LEDs). By utilizing strong confinement effect 2‐phenylethylammonium (2‐PEA) and chirality R / S ‐2‐butylammonium ‐2‐BA), room‐temperature luminescence (CPL) across green to deep blue spectrum is achieved. The CPL attributes transfer spin‐polarized excitons while originates from direct excitation luminescent phases with intrinsic chirality. Finally, CP‐LEDs under ambient are realized. Notably, standard CP‐EL achieved based on 0.8PEA/( ‐2‐BA)‐ 1.2PEA/( ‐2‐BA)‐films impressive electroluminescent asymmetry factors (0.122 0.175), highlighting potential chiral in opening avenues full‐color display.

Language: Английский

Citations

6