Entropy-Driven Strongly Confined Low-Toxicity Pure-Red Perovskite Quantum Dots for Spectrally Stable Light-Emitting Diodes DOI
Jie Guo,

Yuhao Fu,

Weijia Zheng

et al.

Nano Letters, Journal Year: 2023, Volume and Issue: 24(1), P. 417 - 423

Published: Dec. 27, 2023

Spectrally stable pure-red perovskite quantum dots (QDs) with low lead content are essential for high-definition displays but difficult to synthesize due QD self-purification. Here, we make use of entropy-driven quantum-confined QDs fabricate light-emitting diodes (LEDs) that have toxicity and efficient spectrum-stable. Based on experimental data first-principles calculations, multiple element alloying results in a 60% reduction while improving entropy promote crystal stability. Entropy-driven exhibit photoluminescence 100% yields single-exponential decay lifetimes without alteration their morphology or structure. The LEDs utilizing spectrally electroluminescence, achieving brightness 4932 cd/m2, maximum external efficiency over 20%, 15-fold longer operational lifetime than the CsPbI3 QD-based LEDs. These achievements demonstrate can mitigate local compositional heterogeneity ion migration.

Language: Английский

Long-range order enabled stability in quantum dot light-emitting diodes DOI
Ya‐Kun Wang, Haoyue Wan, Sam Teale

et al.

Nature, Journal Year: 2024, Volume and Issue: 629(8012), P. 586 - 591

Published: May 8, 2024

Language: Английский

Citations

54
Nanosurface-reconstructed perovskite for highly efficient and stable active-matrix light-emitting diode display DOI

Hongjin Li,

Yifeng Feng,

Meiyi Zhu

et al.

Nature Nanotechnology, Journal Year: 2024, Volume and Issue: 19(5), P. 638 - 645

Published: April 22, 2024

Language: Английский

Citations

52
Nucleophilic Reaction‐Enabled Chloride Modification on CsPbI3 Quantum Dots for Pure Red Light‐Emitting Diodes with Efficiency Exceeding 26 % DOI

Yifeng Feng,

Hongjin Li,

Meiyi Zhu

et al.

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(11)

Published: Jan. 23, 2024

Abstract High‐performance pure red perovskite light‐emitting diodes (PeLEDs) with an emission wavelength shorter than 650 nm are ideal for wide‐color‐gamut displays, yet remain unprecedented challenge to progress. Mixed‐halide CsPb(Br/I) 3 emitter‐based PeLEDs suffer spectral stability induced by halide phase segregation and CsPbI quantum dots (QDs) from a compromise between electroluminescence efficiency. Here, we demonstrate efficient centered at 638 based on PbCl x ‐modified QDs. A nucleophilic reaction that releases chloride ions manipulates the ligand equilibrium of colloidal system is developed synthesize The comprehensive structural spectroscopic characterizations evidence formation outside QDs, which regulates exciton recombination prevents dissociation surface defects. In consequence, QDs superior optoelectronic properties stable spectra high driving voltages, record external efficiency 26.1 %, optimal roll‐off 16.0 % 1000 cd m −2 , half lifetime 7.5 hours 100 representing state‐of‐the‐art PeLEDs. This work provides new insight into constructing carrier‐confined structure high‐performance

Language: Английский

Citations

44
Perovskite Quantum Dots for the Next‐Generation Displays: Progress and Prospect DOI
Qingsong Shan, Yuhui Dong, Hengyang Xiang

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(36)

Published: March 5, 2024

Abstract The “Nobel Prize in Chemistry 2023” is awarded to Moungi G. Bawendi, Louis E. Brus, and Alexey I. Yekimov for discovering synthesizing Quantum Dots (QDs). Colloidal QDs possess fascinating size‐, morphological‐, composition‐, assembly‐tunable electronic optical properties, which makes them star materials various optoelectronic applications, especially as luminescent next‐generation wide color gamut ultra‐high‐definition displays. Perovskite (PQDs) have gained widespread attention recent years. In less than ten years, research on perovskite‐related devices has basically been perfected terms of quantum yield external efficiency (EQE). However, the eve its industrial application, some key technical indicators processes need be met resolved. development transformation QD then focuses progress luminescence linewidth EQE PQD light‐emitting diode. Finally, several application avenues are reviewed PQDs, challenges opportunities field proposed.

Language: Английский

Citations

42
Efficient pure-red perovskite light-emitting diodes with strong passivation via ultrasmall-sized molecules DOI Creative Commons
Ji Jiang, Mingming Shi, Zhengchang Xia

et al.

Science Advances, Journal Year: 2024, Volume and Issue: 10(18)

Published: May 3, 2024

Perovskite light-emitting diodes (PeLEDs) have attracted great attention in recent years; however, the halogen vacancy defects perovskite notably hamper development of high-efficiency devices. Previously, large-sized passivation agents been usually used, while effect defect is limited due to weak bonding or large space steric hindrance. Here, we predict that ultrasmall-sized formate (Fa) and acetate (Ac) more efficient ability because stronger binding with perovskite, as demonstrated by density functional theory calculation. We introduce cesium salts (CsFa/CsAc) into buried interface, which can also diffuse bulk, resulting both interface bulk passivation. In addition, improved growth has found enhanced hydrophily after introducing CsFa/CsAc additive. According these advantages, a pure-red PeLED 24.2% efficiency at 639 nm achieved.

Language: Английский

Citations

24
Designing high-performance pure-red metal halide perovskite materials and light-emitting diodes for Rec. 2020 display DOI
Shiliang Mei,

Jialin Yin,

Yifeng Xing

et al.

Nano Energy, Journal Year: 2024, Volume and Issue: 122, P. 109339 - 109339

Published: Jan. 26, 2024

Language: Английский

Citations

23
How to improve the structural stabilities of halide perovskite quantum dots: review of various strategies to enhance the structural stabilities of halide perovskite quantum dots DOI Creative Commons
Dokyum Kim,

Taesun Yun,

Sangmin An

et al.

Nano Convergence, Journal Year: 2024, Volume and Issue: 11(1)

Published: Jan. 27, 2024

Abstract Halide perovskites have emerged as promising materials for various optoelectronic devices because of their excellent optical and electrical properties. In particular, halide perovskite quantum dots (PQDs) garnered considerable attention emissive light-emitting diodes (LEDs) higher color purities photoluminescence yields compared to conventional inorganic (CdSe, ZnSe, ZnS, etc.). However, PQDs exhibit poor structural stabilities in response external stimuli (moisture, heat, etc . ) owing inherent ionic nature. This review presents recent research trends insights into improving the PQDs. addition, origins methods overcome this drawback are discussed. The degradation is mainly caused by two mechanisms: (1) defect formation on surface ligand dissociation ( i.e., detachment weakly bound ligands from PQDs), (2) vacancy migration lattices due low energy ions. can be improved through four methods: modification, core–shell structure, (3) crosslinking, (4) metal doping, all which presented detail herein. provides a comprehensive understanding opto-electrical properties expected contribute future device performance dot LEDs (PeLEDs).

Language: Английский

Citations

22
Bi‐Ligand Synergy Enables Threshold Low Voltage and Bandgap Stable Pure‐Red Mix‐Halide Perovskite LEDs DOI

Hong‐Wei Duan,

Feng Zhao,

Sheng‐Nan Li

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(19)

Published: Jan. 14, 2024

Abstract Perovskite light‐emitting diodes (LEDs) emitting in the pure‐red range of 630–640 nm show promise meeting requirement Rec.2100 standard for high‐resolution displays. However, high‐performing LEDs (external quantum efficiency, EQE >20%) suffer from half‐life time (luminance drop to 50% initial luminance) <1.6 h, resulting injection/transportation barrier and surface‐defects–induced charge carrier quenching. Herein, a bi‐ligand synergy strategy is developed address T 50 issue: introduction iodide‐rich ligands with different chain length increases vacancy formation energy halogen ions enhances exciton binding energy, high photoluminescence yield over 92%. The treated CsPbBr x /I 3− films exhibit 34‐fold improved material stability related control at continuous aging 100 °C. As result, CIE coordinates (0.698, 0.301) approaching are reported. These low turn‐on voltage 1.8 V, which lowest among reported perovskite LEDs, even 0.15 V lower than optical bandgap (1.95 eV); maximum ≈21% fourfold enhanced relative best previous LEDs.

Language: Английский

Citations

20
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
High performance and stable pure-blue quasi-2D perovskite light-emitting diodes by multifunctional zwitterionic passivation engineering DOI Creative Commons
Chao Shen,

Shuyan Fang,

Jibin Zhang

et al.

Advanced Photonics, Journal Year: 2024, Volume and Issue: 6(02)

Published: Feb. 26, 2024

Despite the rapid advances of red and green perovskite light-emitting diodes (PeLEDs), achieving high brightness with external quantum efficiency (EQE) remains a challenge for pure-blue PeLEDs, which greatly hinders their practical applications, such as white-light illumination in optical communication high-speed low-loss light source. Herein, we report high-performance PeLED based on mixed-halide quasi-2D perovskites incorporated zwitterionic molecule 3-(benzyldimethylammonio) propanesulfonate (3-BAS). Experimental density functional theory analysis reveals that 3-BAS can simultaneously eliminate non-radiative recombination loss, suppress halide migration, regulate phase distribution smoothing energy transfer perovskites, leading to final photoluminescence yield robust spectrum stability. Thus, recorded 1806 cd m−2 relative higher EQE 9.25% is achieved, successfully demonstrated visible system voice signal transmission. We pave way highly efficient PeLEDs great application potential future networks.

Language: Английский

Citations

17