High‐Performance Green Quasi‐2D Perovskite Light‐Emitting Diodes via Passivated Defects DOI
Wei Yang, Xinxin Ban, Xiaoli He

et al.

Advanced Optical Materials, Journal Year: 2024, Volume and Issue: 12(13)

Published: Feb. 5, 2024

Abstract In next generation semiconductors, metal halide perovskite materials would replace traditional light‐emitting since their exceptional photoelectronic characteristics. The future development of diodes have generated challenges such as abundant surface or interfacial defects and exciton quenching. To overcome these challenges, the layer is modified utilizing benzimidazole/phosphine oxide hybrid 1,3,5‐tris(1‐(4‐(diphenylphenylphosphoryl)phenyl)‐1H‐benzo[d]imidazol‐2‐yl)benzene (TPOB) 1,3,5‐tris(diphenylphosphoryl)benzene (TPO) with high triple energy state. It demonstrated by X‐ray photoelectron spectroscopy results that oxygen atoms in P = O functional group TPOB TPO provided lone electron pairs coordinate to unsaturated Pb 2+ turn led a decrease cloud density Br‐, which can suppress defects. Additionally, this technique improved morphology film, reduced roughness, facilitated carrier transport, all are crucial for achieving high‐emission efficiency. As result, optimal devices has EQEs 16.20 20.48% (TPO), respectively. Furthermore, excellent reproducibility. Excitingly, champion EQE value device 22.64%. Simultaneously, it increase stability lifetimes increased from 1231 s (Pristine) 5421 5631 (TPO).

Language: Английский

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

6
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
Shiny quantum dots: synthesis, properties, and electroluminescent light-emitting diodes DOI

Hongwei Wang,

Boyang Wang,

Jiaxin Bai

et al.

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(34), P. 22417 - 22441

Published: Jan. 1, 2024

We provide an overview of recent advances in the structure, preparation, and optical properties various quantum dots (QDs), discuss strategies for improving electroluminescence performance response to current challenges QD research.

Language: Английский

Citations

5
Efficient Perovskite Light‐Emitting Diodes Enabled by Nickel Acetate Interlayer DOI Open Access
Qin Zhang, Yaping Zhao, Xiangqian Qin

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(12)

Published: Dec. 10, 2023

Abstract Metal halide perovskite light‐emitting diodes (Pero‐LEDs) have gained great attention due to their promising applications in lighting and displays. However, conventional three‐layered sandwich structure, some undeserved carrier behaviors, such as imbalanced injection, severe loss, unstable recombination zone, limit the device's performance. Herein, a four‐layered design by inserting nickel acetate (Ni(OAc) 2 ) interlayer between emitter hole‐transport layer(HTL) manage behavior improve radiative efficiency is proposed. Specifically, Ni(OAc) poorly conductive can partially block hole making hole‐electron injection more balanced. And avoids direct contact transporter, reducing interfacial quenching. Moreover, inhibits electron‐migrated at transporter interface, confining zone layer. As result, corresponding Pero‐LEDs achieve maximum external quantum ( EQE max of 24.6% with good reproducibility, showing an average over 20%.

Language: Английский

Citations

13
Highly Solvent Resistant Small-Molecule Hole-Transporting Materials for Efficient Perovskite Quantum Dot Light-Emitting Diodes DOI
Daqing Zhang, Changting Wei, Xiansheng Li

et al.

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(37), P. 44043 - 44053

Published: Sept. 11, 2023

Perovskite quantum dot light-emitting diodes (Pe-QLEDs) have been shown as promising candidates for next-generation displays and lightings due to their unique feature of wide color gamut high saturation. Hole-transporting materials (HTMs) play crucial roles in the device performance stability Pe-QLEDs. However, small-molecule HTMs less studied Pe-QLEDs poor solvent resistance low hole mobility. In this work, three novel employing benzimidazole center core, named X4, X5, X6, were designed synthesized application One tailored HTM-X6 exhibits excellent resistant ability perovskite (QD) inks its proper solubility surface energy. Our result clearly demonstrated that synergistic effect energy facilitates achievement good QD inks. As a result, maximal external efficiency (EQE) 14.1% is achieved X6-based CsPbBr3 Pe-QLEDs, which much higher than X4 (9.16%) X5 (6.60%)-based devices, comparable PTAA reference (EQE ∼ 15.8%) under same conditions. To best our knowledge, first example benzimidazole-based HTM work provides new guidance rational design with efficient other photoelectronic devices.

Language: Английский

Citations

11
Matched Electron‐Transport Materials Enabling Efficient and Stable Perovskite Quantum‐Dot‐Based Light‐Emitting Diodes DOI Open Access
Jindi Wang, Mingyang Li, Bo Cai

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: July 27, 2024

Abstract Light‐emitting diodes (LEDs) based on perovskite quantum dots (QDs), abbreviated as P‐QLEDs have been regarded significantly crucial emitters for lighting and displays. Efficient stable still lack ideal electron transport materials (ETM), which could efficiently block hole, electron, reduce interface non‐radiative recombination possess high thermal stability. Here, we report 2,4,6‐Tris(3′‐(pyridine‐3‐yl) biphenyl‐3‐yl)‐1,3,5‐triazine (TmPPPyTz, 3P) with strong electron‐withdrawing moieties of pyridine triazine to modulate the performance P‐QLEDs. Compared commonly used 1,3,5‐Tris(1‐phenyl‐1H‐benzimidazol‐2‐yl)benzene (TPBi), in 3P a interaction perovskites, can effectively suppress caused by Pb 2+ defects surface QDs. In addition, deep highest occupied molecular orbital (HOMO) (enhancing hole‐blocking properties), matched lowest unoccupied (LUMO) excellent mobility realizing carrier balance maximizing exciton recombination. Furthermore, resistance obviously improves stability QDs under variable temperature, continuous UV illumination, electric field excitation. Resultantly, using ETM achieved an outstanding champion EQE 30.2 % operational lifetime T 50 3220 hours at initial luminance 100 cd m −2 , is 151 about 11‐fold improvement compared control devices (EQE=20 %, =297 hours), respectively. These results provide new concept constructing efficient from perspective selective ETM.

Language: Английский

Citations

4
Highly Efficient Blue Light-Emitting Diodes Enabled by Gradient Core/Shell-Structured Perovskite Quantum Dots DOI
Bo Xu, Shichen Yuan, Linqin Wang

et al.

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

Published: Jan. 10, 2025

Room temperature (RT) synthesized mixed bromine and chlorine CsPbBrxCl3–x perovskite quantum dots (Pe-QDs) offer notable advantages for blue dot light-emitting diodes (QLEDs), such as cost-effective processing narrow luminescence peaks. However, the efficiency of QLEDs using these RT-synthesized QDs has been limited by inferior crystallinity deep defect presence. In this study, we demonstrate a precise approach to constructing high-quality gradient core–shell (CS) structures QD through anion exchange. Characterization shows that CS-QDs exhibit type-I band alignment with high concentration in core shell. This unique configuration results larger exciton binding energy reduced density, leading enhanced radiative recombination. Consequently, achieve an external (EQE) 16.28%, maximum luminance 8423.35 cd/m2, improved operational stability, surpassing 12.80% EQE reference made homogeneous structured (HS-QDs). These findings present strategy developing CS-QDs, marking significant advancement field efficient pure-blue QLEDs.

Language: Английский

Citations

0
Molecular Design of Anthracene-Based Electron-Transporting Materials for Efficient Blue Perovskite QLEDs DOI
K.H. Tan, Ping Fang,

Dupeng Ding

et al.

Acta Chimica Sinica, Journal Year: 2025, Volume and Issue: 83(1), P. 1 - 1

Published: Jan. 1, 2025

Language: Английский

Citations

0
Blue Perovskite Light-Emitting Diodes with Ultra-low Efficiency Roll-off through Synergistic PVK Incorporation and Antisolvent Treatment DOI
Kunping Guo,

Tong Zhou,

Zhe Tang

et al.

Optical Materials, Journal Year: 2025, Volume and Issue: unknown, P. 116802 - 116802

Published: Feb. 1, 2025

Language: Английский

Citations

0
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