Effective Small Organic Molecule as a Defect Passivator for Highly Efficient Quasi‐2D Perovskite Light‐Emitting Diodes DOI
Ying Li, Fuqiang Li, Zhongkai Yu

et al.

Small, Journal Year: 2024, Volume and Issue: 20(23)

Published: Jan. 4, 2024

Abstract The use of a small organic molecular passivator is proven to be successful strategy for producing higher‐performing quasi‐2D perovskite light‐emitting diodes (PeLEDs). molecule can passivate defects on the grain surround and surface crystal structures, preventing nonradiative recombination charge trapping. In this study, new additive called 2, 8‐dibromodibenzofuran (diBDF) reported examines its effectiveness as passivating agent in high‐performance green PeLEDs. oxygen atom diBDF, acting Lewis base, forms coordination bonds with uncoordinated Pb 2+ , so enhancing performance device. addition, inclusion diBDF results decrease abundance low‐n phases, hence facilitating efficient carrier mobility. Consequently, PeLED devices high efficiency are successfully produced, exhibiting an external quantum 19.9% at emission wavelength 517 nm peak current 65.0 cd A‐ 1 .

Language: Английский

Boosting STE and Nd3+ NIR Luminescence in Cs2AgInCl6 Double Perovskite via Na+/Bi3+‐Induced Local Structure Engineering DOI Open Access

Shilin Jin,

He Yuan,

Tao Pang

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(50)

Published: Aug. 21, 2023

Abstract Currently, lanthanide (Ln 3+ ) doped Pb‐free double perovskites (DPs) suffer from competitive emissions of the self‐trapped exciton (STE) and Ln . Herein, a new type Nd ‐doped Cs 2 AgInCl 6 DPs with Na + /Bi co‐alloying is developed. Benefiting ‐induced local structural modification, both STE broadband visible luminescence near‐infrared (NIR) are boosted via free sensitization. Specifically, total 648‐fold enhancement in emitting intensities compared to ‐free counterpart realized, significantly improved NIR photoluminescence quantum yield (PLQY) 0.16% 30.3%. First‐principles density functional theory calculations, Raman spectra, steady/transient‐state PL spectra verify modification site symmetry, breakdown parity‐forbidden absorption, reduction electron‐phonon coupling doping. Finally, compact vis–NIR light‐emitting diode (LED) designed by Na/Bi/Nd: DP commercial ultraviolet LED chip, which shows promising applications spectroscopic analyses multifunctional lighting.

Language: Английский

Citations

56
Flexible and Stretchable Light-Emitting Diodes and Photodetectors for Human-Centric Optoelectronics DOI
Sehui Chang, Ja Hoon Koo, Jisu Yoo

et al.

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(3), P. 768 - 859

Published: Jan. 19, 2024

Optoelectronic devices with unconventional form factors, such as flexible and stretchable light-emitting or photoresponsive devices, are core elements for the next-generation human-centric optoelectronics. For instance, these deformable can be utilized closely fitted wearable sensors to acquire precise biosignals that subsequently uploaded cloud immediate examination diagnosis, also used vision systems human-interactive robotics. Their inception was propelled by breakthroughs in novel optoelectronic material technologies device blueprinting methodologies, endowing flexibility mechanical resilience conventional rigid devices. This paper reviews advancements soft technologies, honing on various materials, manufacturing techniques, design strategies. We will first highlight general approaches fabrication, including appropriate selection substrate, electrodes, insulation layers. then focus materials diodes, their integration strategies, representative application examples. Next, we move photodetectors, highlighting state-of-the-art fabrication methods, followed At end, a brief summary given, potential challenges further development of functional discussed conclusion.

Language: Английский

Citations

56
Narrow Bandgap Metal Halide Perovskites for All-Perovskite Tandem Photovoltaics DOI Creative Commons
Shuaifeng Hu, Jarla Thiesbrummel, Jorge Pascual

et al.

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(7), P. 4079 - 4123

Published: March 25, 2024

All-perovskite tandem solar cells are attracting considerable interest in photovoltaics research, owing to their potential surpass the theoretical efficiency limit of single-junction cells, a cost-effective sustainable manner. Thanks bandgap-bowing effect, mixed tin-lead (Sn-Pb) perovskites possess close ideal narrow bandgap for constructing matched with wide-bandgap neat lead-based counterparts. The performance all-perovskite tandems, however, has yet reach its potential. One main obstacles that need be overcome is the─oftentimes─low quality Sn-Pb perovskite films, largely caused by facile oxidation Sn(II) Sn(IV), as well difficult-to-control film crystallization dynamics. Additional detrimental imperfections introduced thin film, particularly at vulnerable surfaces, including top and bottom interfaces grain boundaries. Due these issues, resultant device distinctly far lower than theoretically achievable maximum efficiency. Robust modifications improvements surfaces films therefore critical advancement field. This Review describes origins covers efforts made so toward reaching better understanding perovskites, particular respect surface improved stability cells. In addition, we also outline important issues integrating subcells achieving reliable efficient double- multi-junction tandems. Future work should focus on characterization visualization specific defects, tracking evolution under different external stimuli, guiding turn processing stable cell devices.

Language: Английский

Citations

49
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
Controllable p- and n-type behaviours in emissive perovskite semiconductors DOI
Wentao Xiong, Weidong Tang, Gan Zhang

et al.

Nature, Journal Year: 2024, Volume and Issue: 633(8029), P. 344 - 350

Published: Sept. 11, 2024

Language: Английский

Citations

33
A review of interface engineering characteristics for high performance perovskite solar cells DOI Creative Commons
George G. Njema, Joshua K. Kibet,

Silas M. Ngari

et al.

Deleted Journal, Journal Year: 2024, Volume and Issue: 2, P. 100005 - 100005

Published: April 25, 2024

Language: Английский

Citations

18
Understanding the ligand-assisted reprecipitation of CsPbBr3 nanocrystals via high-throughput robotic synthesis approach DOI Creative Commons
Sheryl L. Sanchez,

Yipeng Tang,

Bin Hu

et al.

Matter, Journal Year: 2023, Volume and Issue: 6(9), P. 2900 - 2918

Published: May 31, 2023

Language: Английский

Citations

36
Mitigating halide ion migration by resurfacing lead halide perovskite nanocrystals for stable light-emitting diodes DOI

Jun‐Nan Yang,

Jingjing Wang, Yi‐Chen Yin

et al.

Chemical Society Reviews, Journal Year: 2023, Volume and Issue: 52(16), P. 5516 - 5540

Published: Jan. 1, 2023

Lead halide perovskite nanocrystals are promising for next-generation high-definition displays, especially in light of their tunable bandgaps, high color purities, and carrier mobility. Within the past few years, external quantum efficiency nanocrystal-based light-emitting diodes has progressed rapidly, reaching standard commercial applications. However, low operational stability these remains a crucial issue industrial development. Recent experimental evidence indicates that migration ionic species is primary factor giving rise to performance degradation diodes, ion closely related defects on surface at grain boundaries thin films. In this review, we focus central idea reconstruction nanocrystals, discuss influence migration, summarize recent advances resurfacing nanocrystal strategies toward mitigating improve as-fabricated diode devices. From perspective resurfacing, set out research direction improving both spectral diodes.

Language: Английский

Citations

33
Molecularly Designing a Passivation ETL to Suppress EQE Roll-off of PeLEDs DOI
Qungui Wang, Yongjian Chen, Cheng Yan

et al.

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(9), P. 3710 - 3719

Published: Aug. 8, 2023

Efficiently suppressing the external quantum efficiency (EQE) roll-off of perovskite light-emitting diodes (PeLEDs) urgently requires designing passivation electron transporting layers (ETLs) for intrinsically passivating surface defects toward next-generation illumination and display. Here, we molecularly designed inherent ETL B3PyPPM with a strong nucleophilic core-group to effectively passivate defects. Compared B3PyMPM, can theoretically form tighter interaction transfer more electrons better Pb2+ vacancies, leading superior suppression EQE in PeLEDs by reducing trap-assisted nonradiative recombination. Experimentally, B3PyPPM-based PeLED exhibits higher 18.04%, greater luminance 4.15 times, longer T50 5.38 times than B3PyMPM-based PeLEDs, evidently proving stronger core-group-based ETL. Therefore, this work provides important guidance rationally multifunctional ETLs achieve high-performance long-term stability PeLEDs.

Language: Английский

Citations

33
Hydrogen Bond-Assisted Dual Passivation for Blue Perovskite Light-Emitting Diodes DOI
Zhongkai Yu, Xinyu Shen,

Xiangyang Fan

et al.

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(10), P. 4296 - 4303

Published: Sept. 21, 2023

Although significant progress has been made in the development of green, red, and near-infrared perovskite light-emitting diodes (PeLEDs), blue PeLEDs exhibit inferior performance, owing to various defects poor carrier injection solution-processed films. Thus, this study incorporates dual-passivation additive diphenylphosphinamide (DPPA) into films, through density functional theory calculations experimental characterizations, DPPA proven be an effective passivator. Its phosphine oxide group coordinates with unsaturated lead ions, passivating defects, while amino forms hydrogen bonds adjacent halide suppressing their migration further strengthening passivation effect. Blue quasi-two-dimensional based on DPPA-modified films achieved external quantum efficiency 12.31% emission peak at 486 nm. Moreover, device operational lifetime was extended by 32% more stable spectra decreased defect suppressed ion film.

Language: Английский

Citations

29