Perovskite spin light-emitting diodes with simultaneously high electroluminescence dissymmetry and high external quantum efficiency

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

---

High‐Performance Sky‐Blue Perovskite Spin‐Light Emitting Diodes Due to Chiral Ionic Liquid Implantation and Passivation

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

---

Unraveling Chiral Perovskite Spin‐Light Emitting Diode Performance and Magneto‐Chiroptical Properties Relationship Due to the Synergistic Effect

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

---

Chiral europium halides with high-performance magnetic field tunable red circularly polarized luminescence at room temperature

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

Published: March 14, 2025

Chiral organic-inorganic hybrid metal halides as promising circularly polarized luminescence (CPL) emitter candidates hold great potential for high-definition displays and future spin-optoelectronics. The recent challenge lies primarily in developing high-performance red CPL emitters. Here, coupling the f-f transition characteristics of trivalent europium ions (Eu3+) with chirality, we construct chiral Eu-based halides, (R/S-3BrMBA)3EuCl6, which exhibit strong predictable emission large photoluminescence quantum yield (59.8%), narrow bandwidth (≈2 nm), long lifetime ms), together dissymmetry factor |glum| 1.84 × 10−2. Compared previously reported these show highest brightness. Furthermore, degree polarization (R/S-3BrMBA)3EuCl6 can be manipulated by external magnetic field. Particularly, benefiting from field-generated Zeeman splitting spin mixing at exciton states, an anomalously positive magneto-photoluminescence was observed room temperature. This work provides efficient strategy constructing both pure-red It also opens door rare-earth toward optoelectronic spintronic applications. perovskites are materials luminescence. Here authors present leading to magneto-chiroptical properties.

Language: Английский

---

Quantification of Chirality Induced Spin–Orbit Coupling for Long Spin Polarized Lifetime in Hybrid Perovskite

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

---

Chiral metal halide perovskites toward room temperature spin light-emitting diodes: Insights and perspectives

Chemical Physics Reviews, Journal Year: 2025, Volume and Issue: 6(2)

Published: April 14, 2025

Chiral metal halide perovskites (MHPs) have emerged for the excellent integration of spin states freedom with optoelectronic properties. The chiral-induced selectivity (CISS) effect enables chiral MHPs great potential to spin-dependent applications. In this review, we briefly summarize construction principles and recent discoveries on CISS MHPs. Then, room temperature light-emitting diodes (spin-LEDs) based are discussed. end, challenges opportunities related spin-LEDs proposed.

Language: Английский

---