Thermal management towards ultra-bright and stable perovskite nanocrystal-based pure red light-emitting diodes DOI Creative Commons

Hongjin Li,

Xiaofang Zhu,

Dingshuo Zhang

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Aug. 2, 2024

Despite the promising candidacy of perovskite nanocrystals for light-emitting diodes, their pure red electroluminescence is hindered by low saturated luminance, severe external quantum efficiency roll-off, and inferior operational stability. Here, we report ultra-bright stable diodes manipulating Joule heat generation in nanocrystal emissive layer thermal management within device. Diphenylphosphoryl azide-mediated regulation surface synergistically enhances optical properties carrier transport layer, enabling reduced thus lowering working temperature. These merits inhibit ion migration CsPb(Br/I)3 film, excellent spectra Combined with highly thermal-conductive sapphire substrates implementation pulse-driving mode, exhibit an luminance 390,000 cd m-2, a peak 25%, suppressed half-life 20 hours, superior spectral stability 15 A cm-2.

Language: Английский

A Multifunctional “Halide‐Equivalent” Anion Enabling Efficient CsPb(Br/I)3 Nanocrystals Pure‐Red Light‐Emitting Diodes with External Quantum Efficiency Exceeding 23% DOI
Jibin Zhang, Tiankai Zhang, Zhuangzhuang Ma

et al.

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(8)

Published: Dec. 9, 2022

Pure-red perovskite LEDs (PeLEDs) based on CsPb(Br/I)3 nanocrystals (NCs) usually suffer from a compromise in emission efficiency and spectral stability account of the surface halide vacancies-induced nonradiative recombination loss, phase segregation, self-doping effect. Herein, "halide-equivalent" anion benzenesulfonate (BS- ) is introduced into NCs as multifunctional additive to simultaneously address above challenging issues. Joint experiment-theory characterizations reveal that BS- can not only passivate uncoordinated Pb2+ -related defects at NCs, but also increase formation energy vacancies. Moreover, because strong electron-withdrawing property sulfonate group, electrons are expected transfer NC for reducing effect altering n-type behavior near ambipolarity. Eventually, synergistic boost device performance achieved pure-red PeLEDs with CIE coordinates (0.70, 0.30) champion external quantum 23.5%, which one best value among ever-reported red approaching Rec. 2020 primary color. -modified PeLED exhibits negligible wavelength shift under different operating voltages. This strategy paves an efficient way improving PeLEDs.

Language: Английский

Citations

95
Ultrathin Light-Emitting Diodes with External Efficiency over 26% Based on Resurfaced Perovskite Nanocrystals DOI Creative Commons
Qun Wan, Weilin Zheng, Chen Zou

et al.

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(2), P. 927 - 934

Published: Jan. 10, 2023

Light-emitting diodes based on perovskite nanocrystals (PNCs-LEDs) have gained great interest for next-generation display and lighting technologies prized their color purity, high brightness, luminous efficiency which approach the intrinsic limit imposed by light extraction from device structure. Although time is ripe development of effective outcoupling strategies to further boost performance, this technologically relevant aspect PNC-LEDs still without a definitive solution. Here, following theoretical guidelines integration complex photonic structures, we realize stable with external quantum (EQE) as 26.7%. Key such performance channeling recombination zone in PNC emissive layers thin 10 nm, achieve finely balancing charge transport using CsPbBr3 PNCs resurfaced nickel oxide layer. The ultrathin general and, principle, applicable other nanostructures fabricating highly efficient, color-tunable transparent LEDs.

Language: Английский

Citations

95
Efficient all-thermally evaporated perovskite light-emitting diodes for active-matrix displays DOI
Jinghui Li, Pei Du, Qingxun Guo

et al.

Nature Photonics, Journal Year: 2023, Volume and Issue: 17(5), P. 435 - 441

Published: April 6, 2023

Language: Английский

Citations

88
Recent Progress of Polarization‐Sensitive Perovskite Photodetectors DOI

Hong‐Yi Hou,

Shuo Tian,

Heng‐Ru Ge

et al.

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(48)

Published: Sept. 20, 2022

Abstract Polarization‐sensitive photodetectors are gaining numerous attention since polarization detection is important in geological remote sensing, atmospheric monitoring, military recon, and medical examination. Among various reported photoactive materials for photodetectors, metal halide perovskites have outstanding advantages such as tunable band gaps, excellent optoelectronic properties, easy fabrication. Moreover, the characteristics of crystal structure anisotropy controllable growth orientation perovskite crystals endow photodetector with ability to identify light states. This review outlines recent research progress on polarization‐sensitive detection. Firstly, key device parameters introduced. Then, detectors field linear circular reviewed according different principles response. Finally, challenges discussed.

Language: Английский

Citations

79
Recent progress of transition metal-based catalysts as cathodes in O2/H2O-involved and pure Li–CO2batteries DOI
Jian Chen, Xiaoyang Chen, Yang Liu

et al.

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(3), P. 792 - 829

Published: Jan. 1, 2023

The composition, structure, reaction mechanism of transition metal-based catalysts and their effects on the electrochemical performance Li-CO 2 cells were summarized, some perspectives for development put forward.

Language: Английский

Citations

78
A Multifunctional Additive Strategy Enables Efficient Pure‐Blue Perovskite Light‐Emitting Diodes DOI
Yongjie Liu, Shuxin Wang,

Zhiqiu Yu

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(35)

Published: May 11, 2023

Lead halide perovskites have shown exceptional performance in light-emitting devices (PeLEDs), particularly producing significant electroluminescence sky-blue to near-infrared wavelengths. However, PeLEDs emitting pure-blue light at 465-475 nm are still not satisfactory. Herein, efficient and stable reported by controlling phase distribution, passivation of defects, as well surface modifications using multifunctional phenylethylammonium trifluoroacetate (PEATFA) reduced-dimensional p-F-PEA2 Csn-1 Pbn (Br0.55 Cl0.45 )3n+1 polycrystalline perovskite films. Compared with 4-fluorophenylethylammonium (p-F-PEA+ ) the pristine films, (PEA+ has lower adsorption energy while interacting perovskites, resulting large-n low-dimensional which can greatly facilitate charge transport within The interaction between CO group (TFA- significantly reduces defects Additionally, electron-giving CF3 TFA- uplifts potential smooth electronic injection devices. additive strategy leads elevated radiative recombination carrier films As a result, exhibit maximum external quantum efficiency (EQE) 11.87% 468 spectral output, highest date for PeLEDs. Thus, this study extends way high-efficiency LED polycrystal

Language: Английский

Citations

71
Inhibition of Ion Migration for Highly Efficient and Stable Perovskite Solar Cells DOI Open Access
Yang Zhong, Jia Yang, Xueying Wang

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(52)

Published: April 17, 2023

Abstract In recent years, organic‐inorganic halide perovskites are now emerging as the most attractive alternatives for next‐generation photovoltaic devices, due to their excellent optoelectronic characteristics and low manufacturing cost. However, resultant perovskite solar cells (PVSCs) intrinsically unstable owing ion migration, which severely impedes performance enhancement, even with device encapsulation. There is no doubt that investigation of migration summarization advances in inhibition strategies necessary develop “state‐of‐the‐art” PVSCs high intrinsic stability accelerated commercialization. This review systematically elaborates on generation fundamental mechanisms PVSCs, impact hysteresis, phase segregation, operational stability, characterizations PVSCs. Then, many related works inhibiting toward highly efficient stable summarized. Finally, perspectives current obstacles prospective boost meet all requirements commercialization success

Language: Английский

Citations

67
Ligand‐Induced Cation–π Interactions Enable High‐Efficiency, Bright, and Spectrally Stable Rec. 2020 Pure‐Red Perovskite Light‐Emitting Diodes DOI Open Access
Jibin Zhang, Bo Cai, Xin Zhou

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(45)

Published: July 19, 2023

Achieving high-performance perovskite light-emitting diodes (PeLEDs) with pure-red electroluminescence for practical applications remains a critical challenge because of the problematic luminescence property and spectral instability existing emitters. Herein, high-efficiency Rec. 2020 PeLEDs, simultaneously exhibiting exceptional brightness stability, based on CsPb(Br/I)3 nanocrystals (NCs) capping aromatic amino acid ligands featuring cation-π interactions, are reported. It is proven that strong interactions between PbI6 -octahedra units electron-rich indole ring tryptophan (TRP) molecules not only chemically polish imperfect surface sites, but also markedly increase binding affinity ligand molecules, leading to high photoluminescence quantum yields greatly enhanced stability NCs. Moreover, incorporation small-size TRP ensures superior charge-transport properties assembled emissive layers. The resultant devices emitting at around 635 nm demonstrate champion external efficiency 22.8%, max luminance 12 910 cd m-2 , outstanding representing one best-performing PeLEDs achieved so far.

Language: Английский

Citations

64
Boosting External Quantum Efficiency of Blue Perovskite QLEDs Exceeding 23% by Trifluoroacetate Passivation and Mixed Hole Transportation Design DOI

Yingyi Nong,

Jisong Yao, Jiaqi Li

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(27)

Published: April 17, 2024

Abstract Perovskite quantum dot‐based light‐emitting diodes (QLEDs) have been considered a promising display technology due to their wide color gamut for authentic expression. Currently, the external efficiency (EQE) state‐of‐the‐art blue perovskite QLEDs is about 15%, which still lags behind its green and red counterparts (>25%) film‐based LEDs. Here, that achieve an EQE of 23.5% at 490 nm presented, best knowledge, highest value reported among perovskite‐based LED fields. This impressive achieved through combination dot (QD) passivation optimal device design. First, mixed halide CsPbCl 3− x Br QDs passivated by trifluoroacetate exhibit excellent exciton recombination behavior with photoluminescence yield 84% reducing uncoordinated Pb surface defects. Furthermore, designed introducing hole‐transport layer (M‐HTL) increase hole injection transportation capacity improve carrier balance. It further found M‐HTL can decrease leakage radiative in device, evidenced visual electroluminescence spectrum 2.0 V. The work breaks gap 20% significantly promotes commercialization process.

Language: Английский

Citations

64
Highly efficient blue light-emitting diodes based on mixed-halide perovskites with reduced chlorine defects DOI Creative Commons
Yun Gao,

Qiuting Cai,

Yifan He

et al.

Science Advances, Journal Year: 2024, Volume and Issue: 10(29)

Published: July 17, 2024

Perovskite light-emitting diodes (PeLEDs) provide excellent opportunities for low-cost, color-saturated, and large-area displays. However, the performance of blue PeLEDs lags far behind that their green red counterparts. Here, we show external quantum efficiencies (EQEs) scale linearly with photoluminescence yields (PL QYs) CsPb(Br

Language: Английский

Citations

60