ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 2341 - 2348
Published: April 16, 2025
Language: Английский
Science Advances, Journal Year: 2024, Volume and Issue: 10(36)
Published: Sept. 6, 2024
The poor operational stability of perovskite light-emitting diodes (PeLEDs) remains a major obstacle to their commercial application. Achieving high brightness and quantum efficiency at low driving voltages, thus effectively reducing heat accumulation, is key enhancing the lifetime PeLEDs. Here, we present breakthrough, attaining record-low voltage while maintaining efficiency. By thoroughly suppressing interface recombination ensuring excellent charge transport, our PeLEDs, with an emission peak 515 nanometers, achieve maximum 90,295 candelas per square meter external 27.8% ultralow turn-on 1.7 volts (~70% bandgap voltage). Notably, Joule nearly negligible these substantially extending 7691.1 hours. Our optimized strategies tackle issue through thermal management, paving way for highly stable
Language: Английский
Citations
18
Science Advances, Journal Year: 2025, Volume and Issue: 11(11)
Published: March 14, 2025
Perovskite quantum dots (QDs) show an excellent application perspective in semiconductor optoelectronic devices. However, problems of ligand loss during the growth, purification, film formation, and storage process always induce aggregation ripening QDs, adversely affecting QDs’ QD-based devices’ performance. Here, we use a bidentate molecule to control toward notable performance boost CsPbI 3 QDs. The strong interaction between QDs molecules maintains stable surface states inhibiting undesirable generation defects. We fabricate light-emitting diodes (LEDs) with maximum external efficiency (EQE) 26.0% at 686 nm operating half-life 10,587 hours initial radiance 190 mW sr −1 m −2 (equivalent luminance 100 cd for green perovskite LEDs). Benefiting from high storability target as-fabricated devices based on QD solution storing 1 month EQE 21.7% (20.3% months).
Language: Английский
Citations
4
Nano Letters, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 17, 2025
Inorganic CsPbI3 perovskite has emerged as a promising emitter for deep-red light-emitting diodes (LEDs) due to its intrinsic thermal stability and suitable bandgap. However, uncontrollable crystallization induced by an alkaline zinc oxide (ZnO) substrate in bulk film-based LEDs leads insufficient external quantum efficiencies (EQEs) at high brightness, leaving obstacles commercialization progress. Herein, we demonstrate effective acidic engineering strategy with wide applicability modify the surface property of ZnO regulate crystallization. Via systematically selecting 1,4-cyclohexanedicarboxylic acid mild dissociation constant functionalize buried interface, mitigate speed deprotonation reaction achieve homogeneous films phase purity fewer defects. The resulting (PeLEDs) exhibit record EQE 19.4% luminance 3400 cd m–2, representing state-of-art PeLEDs. These findings provide valuable insights advancement efficient
Language: Английский
Citations
3
Advanced Materials, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 29, 2025
Abstract Light‐emitting diodes (LEDs) based on halide perovskite nanocrystals have attracted extensive attention due to their considerable luminescence efficiency, wide color gamut, high purity, and facile material synthesis. Since the first demonstration of LEDs MAPbBr 3 was reported in 2014, community has witnessed a rapid development performances. In this review, historical perspective is provided then comprehensive survey current strategies for high‐efficiency lead‐based LEDs, including synthesis optimization, ion doping/alloying, shell coating presented. Then basic characteristics emission mechanisms lead‐free perovskite‐related emitters environmentally friendly from standpoint different colors are reviewed. Finally, progress LED applications covered an outlook opportunities challenges future developments field provided.
Language: Английский
Citations
2
Nano Letters, Journal Year: 2024, Volume and Issue: 24(15), P. 4571 - 4579
Published: April 2, 2024
Efficient pure-red emission light-emitting diodes (LEDs) are essential for high-definition displays, yet achieving is hindered by challenges like phase segregation and spectral instability when using halide mixing. Additionally, strongly confined quantum dots (QDs) produced through traditional hot-injection methods face byproduct contamination due to poor solubility of metal salts in the solvent octadecene (ODE) at low temperatures. Herein, we introduced a novel method benzene-series electrostatic potential instead ODE prevent PbI2 intermediates promote their dissolution into [PbI3]−. Increasing methyl groups on benzene yields precisely sized (4.4 ± 0.1 nm) CsPbI3 QDs with exceptional properties: narrow 630 nm PL peak photoluminescence yield (PLQY) 97%. Sequential ligand post-treatment optimizes optical electrical performance QDs. PeLEDs based optimized achieve EL (CIE: 0.700, 0.290) approaching Rec. 2020 standards, an EQE 25.2% T50 120 min initial luminance 107 cd/m2.
Language: Английский
Citations
12
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
Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(44)
Published: July 16, 2024
Abstract Perovskite quantum dots (PQDs) show high potential for new‐generation light‐emitting diodes (LEDs) due to their outstanding optoelectronic properties. Even though the red PQD‐LEDs can be realized through mixing halide in PQDs tune spectroscopies, may suffer from phase separation under a electric field, predominantly affecting LED applications. Herein, ligand‐pinning‐assisted approach is reported spectroscopies of CsPbI 3 PQDs, which vinyl phosphonic acid (VPA) applied as function ligands regulate nucleation and growth during synthesis. Systematically experimental studies theoretical calculations are conducted comprehensively understand functions VPA PQD synthesis, reveals that with binding energy Pb 2+ cations could firmly anchor on surface matrix without desorption, regulating thus resulting tunable being realized. Meanwhile, also renovate defective substantially diminishing trap‐induced nonradiative recombination. Consequently, deliver external efficiency 22.83%, significantly improved compared control devices. This work provides new avenue toward high‐performing LEDs.
Language: Английский
Citations
8
Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown
Published: May 10, 2024
Abstract Metal halide perovskite single crystals (MHP SCs) have attracted extensive attention due to their superior properties, such as higher carrier mobility, longer diffusion length, and better stability than polycrystalline counterparts. In particular, the suppression of ion migration Auger recombination endows MHP SCs with excellent electroluminescence (EL) thus holding great potential for highly efficient stable light‐emitting devices. this review, general overview crystal structures are begin, highlight merits in terms outstanding optoelectronic properties high stability. Then, appropriate growth methods high‐quality, thickness‐controlled EL device applications systematically summarized. Subsequently, recent advancements developing SC‐based diodes (PeLEDs) discussed, effective strategies further enhance performance reviewed. Moreover, application electrically pumped lasers is highlighted. Finally, review concluded a detailed account current challenges perspective on key approaches opportunities optimization SC growth, improvement integration
Language: Английский
Citations
7
Nano Letters, Journal Year: 2024, Volume and Issue: 24(21), P. 6410 - 6416
Published: May 20, 2024
CsPbI
Language: Английский
Citations
7
Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(16), P. 5756 - 5794
Published: Jan. 1, 2024
This review comprehensively discusses the latest advances in surface matrix regulation of perovskite quantum dots and proposes opportunities challenges for high-performance solar cells.
Language: Английский
Citations
7