Transparent Programmable Luminescent Tags Enabled by Spiro[fluorene-9,9′-xanthene]-Based Hole-Transporting Molecules DOI
Daqing Zhang, Xin Luo, Lucía Labrador‐Páez

et al.

The Journal of Physical Chemistry C, Journal Year: 2024, Volume and Issue: 128(46), P. 19893 - 19900

Published: Nov. 7, 2024

Pure organic ultralong room temperature phosphorescent (URTP) materials have garnered significant attention for applications in luminescent materials, biosensing, and information encryption. These offer advantages over heavy metal such as lower cost, reduced biological toxicity, minimal environmental impact. Herein, the first time, we demonstrate a series of RTP based on spiro[fluorene-9,9′-xanthene] (SFX) hole-transporting molecules, specifically X59 X55. Our research presents that incorporating more rigid SFX units significantly extends lifetime enhances photoluminescence quantum yield (PLQY). The large steric hindrance structures suppresses nonradiative molecular motions, thereby prolonging phosphorescence emission. Compared to baseline molecule X1, experimental results show by 230 ms, while X55 achieves an extension 260 ms. Furthermore, highlight potential this molecules use transparent, programmable tags. work not only expands types but also provides innovative strategies designing long-lived, high-quantum-yield molecules. We envision will advance smart device field their practical applications, intelligent labels, tags, optical sensors.

Language: Английский

Eliminating Chlorine Vacancies of Perovskite Nanocrystals Using Hydrazine Cations Enables Efficient Pure Blue Light-Emitting Diodes DOI
Le Ma, Xiansheng Li, Xiaoming Li

et al.

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(3), P. 1210 - 1218

Published: Feb. 26, 2024

Mixed Br/Cl-perovskite nanocrystals (Pe-NCs) CsPbBrxCl3–x, synthesized at room temperature (RT), offer several advantages for use in light-emitting diodes (LEDs), including cost-effective processing and a narrow luminescence peak. However, achieving efficient pure blue LEDs using CsPbBrxCl3–x NCs has been proven to be challenging due significant number of chlorine defects. In this work, we propose passivation strategy utilizing hydrazine cations (Hz2+) eliminate defects RT-synthesized Pe-NCs. Our investigation reveals that Hz2+ can capture the isolated anion (Cl–) form Hz–Cl–Cs bridge on Pe-NC surface, thereby effectively inhibiting formation vacancies. This approach significantly enhances both photoluminescence efficiency lifetime Consequently, fabricated Hz2+-passivated Pe-NCs achieve an outstanding external quantum (EQE) 7.82% 475 nm. findings highlight effective mitigates Pe-NCs, advancing development LEDs.

Language: Английский

Citations

18
Organic Hole‐Transport Layers: An Innovative Approach for Efficient Perovskite Light‐Emitting Diodes DOI
Amjad Islam,

Syed Hamad Ullah Shah,

Zeeshan Haider

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(17)

Published: Feb. 29, 2024

Abstract Organic–inorganic‐halide‐perovskite (OIHP) based light‐emitting diodes (LEDs) are becoming more and well‐described as having multiple potential uses in lighting display technology, owing to their broad color gamut high purity. Recent research reveals that hole‐transport layers (HTLs) perform crucial roles realizing high‐performance highly stable perovskite (PeLEDs). However, the exploration of organic HTLs for obtaining efficient PeLEDs has lagged behind compared electron‐transport layers. In past few years, some innovative have been developed PeLEDs, which demonstrated excellent performances devices. It established HTL/OIHP interface a significant impact on crystallization behaviors electrical properties OIHP film. Herein, different types (polymer/small molecule) used discussed. Also, mechanism action those devices is also presented. Moreover, recent progress blue, green, red PeLED highlighted. Furthermore, strategies improve performance existing standard reviewed. Additionally, challenges present technology briefly summarized. Lastly, viewpoints regarding ongoing obstacles forthcoming prospects emphasized.

Language: Английский

Citations

8
Self-assembled mono-hole-injecting layers towards efficient deep-blue perovskite light-emitting diodes DOI
Xin Zheng, Changting Wei, Shichen Yuan

et al.

Applied Surface Science, Journal Year: 2024, Volume and Issue: 655, P. 159643 - 159643

Published: Feb. 9, 2024

Language: Английский

Citations

7
Exploring Efficient Dual-Phase Emissive Fluorophores with High Mobility by Integrating a Rigid Donor and Flexible Acceptor DOI

Shiyan Guo,

Xin Jin,

Daheng Zhang

et al.

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(8), P. 10407 - 10416

Published: Feb. 16, 2024

Developing luminogens with a high emission efficiency in both single-molecule and aggregate states, as well mobility, shows promise for advancing the iteration update of organic optoelectronic materials. However, achieving delicate balance between plane configuration luminophores strong exciton interactions aggregates is formidable task from molecular design perspective. This dilemma was overcome by integrating rigid donor flexible acceptor to establish donor–acceptor (D–A) type emitters. The π-conjugate-extended ensures substantial planarity these molecules, allowing solution photoluminescence quantum yield values 86% 75%. Furthermore, restricted motion aggregation-induced moiety formation J-aggregates reduce quenching effect, leading emissive 85% 91% state. mildly distorted D–A geometry builds moderate electrostatic interaction, resulting mobility μM,h 7.12 × 10–5 3.27 10–4 cm2/V s. Additionally, an improved synthesized procedure terminal E-configured acrylonitrile metal-free concise reaction conditions presented. successful application compounds light-emitting diode devices demonstrates practicability strategy connecting acceptor.

Language: Английский

Citations

4
Defect Passivating Hole Transporting Material for Large-Area and Stable Perovskite Quantum-Dot Light-Emitting Diodes DOI
Xiansheng Li,

Hosein Ahangar,

Shiyu Yang

et al.

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

Published: Feb. 11, 2025

Organic hole-transporting materials (HTMs) with high hole mobility and a defect passivating ability are critical for improving the performance stability of perovskite optoelectronics, including quantum dot light-emitting diodes (Pe-QLEDs) solar cells. In this study, we designed two small-molecule HTMs, termed X13 X15, incorporating methylthio group (SMe) as defect-passivating sites to enhance interaction between HTMs layer Pe-QLED applications. Our study highlights that featuring SMe groups at para-position carbazole unit, demonstrates strong superior passivation effects dots. Consequently, Pe-QLEDs (0.09 cm2) X15 HTM achieve maximum external efficiency (EQE) 22.89%. Moreover, employing in large-area (1 yields an EQE 21.10% uniform light emission, surpassing PTAA-based devices (EQE ∼ 15.03%). finding provides crucial insights into molecular design related optoelectronic devices.

Language: Английский

Citations

0
Fused Carbazole‐based Self‐Assembled Monolayers Enable Efficient Perovskite Solar Cells and Perovskite Light‐Emitting Diodes DOI Open Access

Shiyan Guo,

Xiaoxiao Yang, Qin Zhang

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(33)

Published: Aug. 22, 2024

Abstract Carbazole‐derived self‐assembled monolayers (SAMs) with excellent hole‐extraction and injection properties are promising hole‐transporting materials for perovskite optoelectronic devices, including solar cells (PSCs) light‐emitting diodes (PeLEDs). The performance thermal stability of these SAMs heavily influenced by their chemical structure. Herein, the construction fused carbazole‐based is proposed expanding π‐conjugation carbazole unit application in PSCs PeLEDs. Three proof‐of‐concept designed synthesized, termed XS8 , XS9 XS10 that feature highly rigid planar as donor a conjugated alkene linker. This extension improves planarity, stability, enhances molecular dipole moment. Among these, highest degree conjugation, demonstrated superior perovskite‐based devices. PSC device utilizing achieves maximum power conversion efficiency (PCE) 20.28%, surpassing 17.19% PCE classic 2PACz‐based device. Similarly, PeLED external quantum (EQE) 16.6%, compared to 14.5% PEDOT‐based work provides novel design strategy creating efficient stable optoelectronics other organic electronic

Language: Английский

Citations

3
Cold sintering of CsPbBr3 quantum dots embedded KBr ceramics for LED displays DOI Creative Commons
Jie Gao, Yukun Ren, Qi Ding

et al.

Journal of Materiomics, Journal Year: 2024, Volume and Issue: unknown, P. 100933 - 100933

Published: Aug. 1, 2024

Language: Английский

Citations

2
Balancing multiple properties of small molecule hole-transporting materials towards highly efficient perovskite QLEDs DOI
Shiyu Yang, Mostafa Moslempoor, Xiansheng Li

et al.

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 500, P. 157117 - 157117

Published: Oct. 30, 2024

Language: Английский

Citations

2
Paving continuous heat dissipation pathways for quantum dots in polymer with orange-inspired radially aligned UHMWPE fibers DOI Creative Commons
Yang Xuan, Xinfeng Zhang, Tianxu Zhang

et al.

Opto-Electronic Advances, Journal Year: 2024, Volume and Issue: 7(7), P. 240036 - 240036

Published: Jan. 1, 2024

Thermal management of nanoscale quantum dots (QDs) in light-emitting devices is a long-lasting challenge. The existing heat transfer reinforcement solutions for QDs-polymer composite mainly rely on thermal-conductive fillers. However, this strategy failed to deliver the QDs' generation across long distance, and accumulated still causes considerable temperature rise composite, which eventually menaces performance reliability devices. Inspired by radially aligned fruit fibers oranges, we proposed eliminate dissipation challenge establishing long-range ordered pathways within composite. Ultrahigh molecular weight polyethylene (UPEF) were throughout polymer matrix, thus facilitating massive efficient QDs. Under UPEF filling fraction 24.46 vol%, in-plane thermal conductivity QDs-radially (QDs-RAPE) could reach 10.45 W m−1 K−1, highest value reported so far. As proof concept, working can be reduced 342.5 °C when illuminated highly concentrated laser diode (LD) under driving current 1000 mA, improving their optical performance. This work may pave new way next high-power QDs lighting applications.

Language: Английский

Citations

1
Unveiling the Influence of Additive Acidity on the Long-Term Stability of Perovskite Solar Cells DOI

Bihui Sun,

Pingzhi Zhang, Daqing Zhang

et al.

ACS Materials Letters, Journal Year: 2024, Volume and Issue: 7(1), P. 265 - 274

Published: Dec. 17, 2024

Additive engineering plays a vital role in enhancing perovskite solar cells (PSCs) by passivating defects within the films. Carboxyl and ester groups are commonly used for their strong binding with under-coordinated Pb2+ ions. However, impact of additive acidity on long-term stability PSCs remains unclear. This study investigates functional roles 4-amino-3,5-difluorobenzoic acid (DFAB-A) methyl 4-amino-3,5-difluorobenzoate (DFAB-AM), which could effectively passivate film defects. resulting from carboxyl deprotonation DFAB-A negatively impacts structural perovskites. In contrast, DFAB-AM its functionality forms stronger more stable bonds, contributing to improved passivation stability. incorporating achieve high power conversion efficiency 22.51% maintain 84.3% initial after 800 h maximum-power-point operation. These findings underscore importance carbonyl group design developing molecular additives enhance both durability PSCs.

Language: Английский

Citations

1