Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes

Kim, Young Hoon; Kim, Sungjin; Kakekhani, Arvin; Park, Jin-Woo; Park, Jaehyeok; Lee, Yong Hee; Xu, Hengxing; Nagane, Satyawan; Wexler, Robert B.; Kim, Dong Hyeok; Jo, Seung Hyeon; Martínez‐Sarti, Laura; Tan, Peng; Sadhanala, Aditya; Park, Gyeong Su; Kim, Young Woon; Hu, Bin; Bolink, Henk J.; Yoo, Seunghyup; Friend, Richard H.; Rappe, Andrew M.; Lee, Tae Woo

doi:10.1038/s41566-020-00732-4

Cited by 633 publications

(634 citation statements)

References 50 publications

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“…But this value is far higher than generally used thickness of perovskite EMLs in the electroluminescent devices (less than 100 and 50 nm is used here). [ 36,37 ] Moreover, all absorption edges of perovskite films with ZrO 2 NPs demonstrated blueshift, suggesting a narrow n domains distribution.…”

Section: Resultsmentioning

confidence: 98%

Domain Controlling by Compound Additive toward Highly Efficient Quasi‐2D Perovskite Light‐Emitting Diodes

Zhang

Liu

et al. 2021

Adv Funct Materials

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Quasi-2D perovskites with enlarged exciton binding energy and tunable bandgap are appealing for application in perovskite light-emitting diodes (PeLEDs). However, wide n domains distribution is commonly formed in solution-processed quasi-2D perovskite films due to the uncontrollable crystallization behavior, which leads to low device performance. Here, the crystallization process is successfully regulated to narrow the n domains distribution by introducing compound additive of ZrO 2 nanoparticles (NPs) and Cryptand complexant. ZrO 2 NPs can avoid the segregation of organic large and small cations by strengthening the solvent extraction capacity of antisolvent, while Cryptand offsets the poor solubility of PbBr 2 by forming an intermediate state to slow down the crystallization of high-n domains. Consequently, both high photoluminescence quantum yields over 90% and a high external quantum efficiency of 21.2% are obtained in the optimized green quasi-2D PeLEDs. Moreover, the lifetime extends about four times compared with control devices. The strategy of domain controlling by compound additive provides a powerful way to develop high-performance quasi-2D perovskite optoelectrical devices.

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Section: Resultsmentioning

confidence: 98%

Domain Controlling by Compound Additive toward Highly Efficient Quasi‐2D Perovskite Light‐Emitting Diodes

Zhang

Liu

et al. 2021

Adv Funct Materials

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“…Current efficiency of fiber‐shaped LEDs is an order of magnitude lower that, for example, best performing planar perovskite LED. [ 298 ] This suggest that the defects in the emitter film as well as the device heterojunctions require future optimization. Also, the current fiber‐shaped LEDs only report green or yellow emission; there are no reports on blue, red, or near infrared emission.…”

Section: Other Fiber‐shaped Functional Devicesmentioning

confidence: 99%

Fiber‐Shaped Electronic Devices

Fakharuddin

Giacomo

et al. 2021

Advanced Energy Materials

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Textile electronics embedded in clothing represent an exciting new frontier for modern healthcare and communication systems. Fundamental to the development of these textile electronics is the development of the fibers forming the cloths into electronic devices. An electronic fiber must undergo diverse scrutiny for its selection for a multifunctional textile, viz., from the material selection to the device architecture, from the wearability to mechanical stresses, and from the environmental compatibility to the end‐use management. Herein, the performance requirements of fiber‐shaped electronics are reviewed considering the characteristics of single electronic fibers and their assemblies in smart clothing. Broadly, this article includes i) processing strategies of electronic fibers with required properties from precursor to material, ii) the state‐of‐art of current fiber‐shaped electronics emphasizing light‐emitting devices, solar cells, sensors, nanogenerators, supercapacitors storage, and chromatic devices, iii) mechanisms involved in the operation of the above devices, iv) limitations of the current materials and device manufacturing techniques to achieve the target performance, and v) the knowledge gap that must be minimized prior to their deployment. Lessons learned from this review with regard to the challenges and prospects for developing fiber‐shaped electronic components are presented as directions for future research on wearable electronics.

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“…Quantum dot (QD) light-emitting diodes (LEDs) are ideal for next-generation flat-panel displays because of their scalability, cost effectiveness, emission color purity, and tunable chromaticity. [1][2][3][4][5] Considerable research efforts in the past two decades have demonstrated high-efficiency QD LEDs using CdSe, InP, and lead halide perovskite (LHP) nanocrystals (NCs), with external quantum efficiencies, ηext, of up to 20.5%, 4 21.4%, 6 and 23.4%, [7][8][9] respectively. To date, the methods used to enhance device performance have mainly focused on the passivation of NC surface defects.…”

Section: Introductionmentioning

confidence: 99%

“…Taking the defect-tolerant LHP QD system [10][11][12][13] as an example, ligand engineering, modulation of stoichiometric compositions, and cation/anion mixing [14][15][16][17][18] have been employed to substantially improve the device performance. [7][8][9] Nevertheless, as the internal quantum efficiency has approached unity, new strategies that boost the intrinsic light outcoupling efficiency, ηout, become increasingly attractive to bring the device performance to the next level.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Nanoplatelet Superlattices Overcoming Light Outcoupling Efficiency Limit in Perovskite Quantum Dot Light-Emitting Diodes

Kumar

Marcato

Krumeich³

et al. 2021

Preprint

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Quantum dot (QD) light-emitting diodes (LEDs) are emerging as one of the most promising candidates for next-generation displays. However, their intrinsic light outcoupling efficiency remains considerably lower than the organic counterpart, because it is not yet possible to control the transition-dipole-moment (TDM) orientation in QD solids at device level. Here, using the colloidal lead halide perovskite nanoplatelets (NPLs) as a model system, we report a directed self-assembly approach to form the two-dimensional superlattices (2DSLs) with the out-of-plane vector perpendicular to the substrate plane. The ligand and substrate engineering yields close-packed planar arrays with the side faces linked to each other. Emission polarization in individual NPLs rescales the radiation from horizontal and vertical transition dipoles, effectively resulting in preferentially horizontal TDM orientation. Based on the emissive thin films comprised of stacks of 2D superlattices, we demonstrate an enhanced ratio of horizontal dipole as revealed by 2D k-space spectroscopy. Our optimized single-junction QD LEDs showed peak external quantum efficiency of up to 24% and power efficiency exceeding 110 lm W-1, comparable to state-of-the-art organic LEDs.

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Comprehensive defect suppression in perovskite nanocrystals for high-efficiency light-emitting diodes

Cited by 633 publications

References 50 publications

Domain Controlling by Compound Additive toward Highly Efficient Quasi‐2D Perovskite Light‐Emitting Diodes

Domain Controlling by Compound Additive toward Highly Efficient Quasi‐2D Perovskite Light‐Emitting Diodes

Fiber‐Shaped Electronic Devices

Two-Dimensional Nanoplatelet Superlattices Overcoming Light Outcoupling Efficiency Limit in Perovskite Quantum Dot Light-Emitting Diodes

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