Ultrathin, Friendly Environmental, and Flexible CsPb(Cl/Br)3-Silica Composite Film for Blue-Light-Emitting Diodes DOI
Xiong Shen,

Gaozhao Chen,

Xin Peng

et al.

Langmuir, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 27, 2024

Due to intrinsic defects in blue-light-emitting perovskite materials, the charge carriers are prone being trapped by trap states. Therefore, preparation of efficient materials remains a significant challenge. Herein, CsPb(Cl/Br)3 nanocrystal (NCs)@SiO2 structures were fabricated through hydrolyzing (3-aminopropyl)-triethoxysilane (APTS). SiO2 can passivate surface states NCs, suppress nonradiative recombination pathways and effectively stabilize NCs. NCs@SiO2 exhibits higher photoluminescence (PL) intensity lifetime compared those pure The enhancement exciton binding energy (Eb) leads increased PL NCs @SiO2, as demonstrated temperature-dependent spectra. Subsequently, 0.3 mm film NCs@SiO2/poly(methyl methacrylate) (PMMA) was optimizing casting method. effective protection provided PMMA, NCs@SiO2/PMMA excellent thermal, water, air stability. Moreover, also good flexibility, maintaining unchanged under bending conditions. Importantly, lead be well encapsulated preventing from leaking into environment. This research demonstrates potential for applications friendly environmental field optoelectronics, including light-emitting diodes (LEDs) flexible displays.

Language: Английский

Strategies for Stabilizing Metal Halide Perovskite Light-Emitting Diodes: Bulk and Surface Reconstruction of Perovskite Nanocrystals DOI
Ye Wu, Desui Chen, Guangruixing Zou

et al.

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: March 7, 2025

Light-emitting colloidal lead halide perovskite nanocrystals (PeNCs) are considered promising candidates for next-generation vivid displays. However, the operational stability of light-emitting diodes (LEDs) based on PeNCs is still lower than those polycrystalline films, which requires an understanding defect formation in PeNCs, both inside crystal lattice ("bulk") and at surface. Meanwhile, uncontrollable ion redistribution electrochemical reactions under LED operation can be severe, also related to bulk surface quality a well-designed device architecture boost carrier injection balance radiative recombination. In this review, we consider reconstruction by enhancing rigidity rationally selecting ligands. Degradation pathways applied voltage discussed, strategies avoid undesirable migration PeNC films. Subsequently, other critical issues hindering commercial application LEDs including toxicity Pb perovskites, scale-up deposition design active-matrix prototypes high-resolution modules.

Language: Английский

Citations

1
Outcoupling Efficiency Enhanced Blue Perovskite Light-Emitting Diodes Constructed on the Mesoporous Surface of Nonplanar Rigid Molecular Scaffolds DOI

Yangyang Guo,

Zeyi Cheng, Yue Zhang

et al.

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

Producing nanostructures on a perovskite film through crystallization modulation is essential to improving the light outcoupling efficiency and performance of blue light-emitting diodes (PeLEDs). However, challenge achieving films still remains. Herein, we demonstrate that homogeneous nano holes are formed pure-bromide quasi-2D because kinetics significantly modulated by underneath mesoporous buffer layer triptycene-like pyridine with biphenyl substituents (TPC-LB). This nonplanar rigid stereoscopic molecular structure TPC-LB provides ion channels in intermolecular intramolecular cavities effectively confine components perovskite. The enhance PeLEDs. champion device shows maximum luminance 2004 cd m-2 peak external quantum 12.08%, which locates top rank similar devices three times higher than control device. work demonstrates an effective strategy improve PeLEDs, significance for promoting development

Language: Английский

Citations

0
Perovskite nanocrystal superlattices and their application in light-emitting devices DOI
Siqi Sun, Min Lu, Po Lu

et al.

Materials Science and Engineering R Reports, Journal Year: 2025, Volume and Issue: 164, P. 100984 - 100984

Published: March 25, 2025

Language: Английский

Citations

0
Efficient perovskite LEDs with tailored atomic layer number emission at fixed wavelengths DOI Creative Commons
Ligang Wang,

Zher Ying Ooi,

Fengyan Jia

et al.

Science Advances, Journal Year: 2025, Volume and Issue: 11(7)

Published: Feb. 14, 2025

Colloidal quantum dots (QDs) have illuminated computer monitors and television screens due to their fascinating color-tunable properties depending on the size. Here, electroluminescence (EL) wavelength of perovskite LEDs was tuned via atomic layer number (ALN) nanoplates (NPs) instead "size" in conventional QDs. We demonstrated efficient with controllably tailored emission from n = 3, 4, 5, ≥7 ALN NPs specific discrete major peaks at 607, 638, 669, 728 nanometers. These peak external efficiency (EQE) 26.8% high reproducibility less than 1 2 nm difference between batches. High color stability without observable EL spectral change operating best T50 267 minutes 1.0 milliampere per square centimeter also achieved. This work demonstrates a concept tailoring fixed wavelengths, shedding light efficient, emission-discrete, color-stable for next-generation display.

Language: Английский

Citations

0
Controllable Transition Metal Cations Doping Enable Efficient and Spectral Stable Pure‐Red Perovskite QLED DOI Open Access

Yuqin Su,

Qunqing Lin,

Xinyi Lv

et al.

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

Published: Feb. 16, 2025

Mixed-halide perovskite plays important role in wide-color gamut displays as a vital material for three primary colors. However, halide segregation and caused unstable spectra are the intrinsic problem mixed-halide light-emitting diodes (PeLEDs) originating from lattice strain resulting defects quantum dots (PQDs). Here, smaller transition metal cations applied to replace Pb2+ release strain, which avoids halogen escaping/halide vacancies forming ensure high photoluminescence yield (PLQY) stable spectra. actual doping amount is limited by ionic size chemical environment, will affect improvement of optoelectronic performance. Thus, this study proposes strategy introducing tri-n-octylphosphine coordinate strongly with catch them participate nucleation-growth process. Through effectively, CsPb(BrI)3 PQDs show PLQY (92%) long lifetime (107.83 ns). Further, highly efficient pure-red PeLEDs highest external efficiency 16.86% fabricated spectrum can be stabilized at 630 nm only 1 red-shift under bias, showing promising potential next-generation display.

Language: Английский

Citations

0
Carrier Dynamics Process of Bilayer Core–Shell Perovskite Nanocomposites Based on Förster Resonance Energy Transfer DOI
Xiong Shen,

Gaozhao Chen,

Liu He

et al.

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

Published: April 2, 2025

Iodide-based perovskites are severely limited in practical applications due to their low photoluminescence quantum yield (PLQY), tendency undergo phase separation, and severe PL quenching the solid state. Herein, a bilayer core-shell structured perovskite nanocomposite containing Br I (BINC), based on Förster resonance energy transfer (FRET), is prepared. In BINC structure, embedded silica titanium dioxide define Si-BINC Ti-BINC structures, respectively, serving as barrier between donor (CsPbBr3) acceptor (CsPbI3), which prevents migration of halide ions. Additionally, TiO2 acts electron transport layer, facilitating electrons from CsPbBr3 TiO2, then CsPbI3. The outermost layer SiO2 enhances environmental stability structure. Both intensity lifetime at 687 nm structures increase compared with those improvement these optical properties primarily attributed FRET effect. transient absorption (TA) spectra structure shows faster ground state bleaching (GSB, ∼669 nm) signal decay rate than that Ti-BINC. rapid photogenerated carriers indicates it suitable for high-efficiency fast-response LEDs photodetectors. displays stronger GSB slower Si-BINC. This more stable optoelectronic conversion devices, such solar cells photocatalysis. investigation reveals exhibit unique properties, providing insights design efficient composite devices.

Language: Английский

Citations

0
Fabrication of blue-emitting CH3NH3PbBr3 nanocrystals: Effects of dipole moment and oxygen functional groups in precipitation solvents on the crystal growth and optical properties of CH3NH3PbBr3 nanocrystals DOI

Dokyum Kim,

S. K. Park,

Jung Su Park

et al.

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: unknown, P. 137530 - 137530

Published: April 1, 2025

Language: Английский

Citations

0
Highly efficient pure red light-emitting diodes enabled by multifunctional ligand-coordinated CsPbI3 quantum dots DOI
Jing Li, Xiao Hu,

Yifeng Feng

et al.

Nano Energy, Journal Year: 2025, Volume and Issue: unknown, P. 111055 - 111055

Published: April 1, 2025

Language: Английский

Citations

0
Green-emitting CsPbI3 nanorods decorated with CsPb2I5 and Cs4PbI6 nanoclusters DOI
Paundra Rizky Pratama, Azzah Dyah Pramata,

Fuko Shiga

et al.

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

This work presents green-emitting CsPbI 3 nanorods decorated Cs 4 PbI 6 and CsPb 2 I 5 nanoclusters with a color-tuning approach via multiple-phase combinations without changing elements. These materials have stable emission color purity.

Language: Английский

Citations

1
Mg2+‐Doped Cesium Copper Halide for Bright Electroluminescent White Light‐Emitting Diodes DOI Open Access
Yizhang Wu, Min Lu, Po Lu

et al.

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

Published: Oct. 6, 2024

Abstract Lead‐based perovskite nanocrystals (NCs) as one of the most promising materials in fields display and lighting, have outstanding optical performance simple solution preparation process. However, toxicity lead poor stability limit their commercialization. Meanwhile, a key component white light‐emitting diodes (WLEDs) still faces challenges such low luminance complex A method is proposed for preparing nontoxic stable Cs 3 Cu 2 I 5 NCs by doping Mg 2+ ions, achieved broadband blue light emission with high PLQY 96.2% excellent thermal cycling air stability. Then, ions doped are used emissive layer, while 1,3,5‐Tri (m‐pyridine‐3‐ylphenyl) benzene (TmPyPb) selected electron transport layer to interact thin films formation Cu‐I yellow emission. This approach obviated need multi‐layer sedimentary layers, resulting WLEDs featuring color rendering index (CRI) 91, peak external quantum efficiency (EQE) 0.71% maximum 2116 cd m − that highest values lead‐free at present. Therefore, good application prospects WLEDs.

Language: Английский

Citations

1