Large-scale synthesis of ultrathin cesium lead bromide perovskite nanoplates with precisely tunable dimensions and their application in blue light-emitting diodes

Yang, Di; Zou, Yatao; Li, Pengli; Liu, Qipeng; Wu, Linzhong; Hu, Huicheng; Xu, Yong; Sun, Baoquan; Zhang, Qiao; Lee, Shuit‐Tong

doi:10.1016/j.nanoen.2018.03.019

Cited by 160 publications

(171 citation statements)

References 48 publications

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“…As a result, a pure green color with maximum luminescence as high as 10 590 cd m −2 and EQE of 0.48% was obtained ( Figure a–d) . Recently, Yang et al fabricated the blue LED device based on large‐scale ultrathin 2D CsPbBr 3 NPLs with tunable edge length and thickness, which only achieved a maximum luminance of 25 cd m −2 and an EQE of ≈0.1% . Similarly, Bohn et al synthesized monolayer CsPbBr 3 NPLs, which exhibited sharp PL and EL peaks with a tunable emission wavelength between 432 and 497nm due to quantum confinement effect (Figure e,f).…”

Section: Diverse Perovskite Morphologies For Optoelectronic Applicationsmentioning

confidence: 99%

A Review of Diverse Halide Perovskite Morphologies for Efficient Optoelectronic Applications

Zhang

Kuang

2019

Small Methods

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Recent years have witnessed an incredibly high fever in metal halide perovskite materials due to their promising applications in a wide range of optoelectronic applications. The morphologies and optoelectronic properties of the perovskite layers play critical roles in affecting the optoelectronic performances. This review summarizes the recent advances in the fabrication of a variety of perovskite morphologies and their promising progress achieved in different optoelectronic applications, including solar cells, light‐emitting diodes, photodetectors, lasers, photocatalysis, X‐ray detectors/imagers, and luminescent solar concentrators. Several blossoming representatives, including 0D perovskite quantum dots, 1D perovskite nanowires, 2D perovskite nanosheets/nanoplatelets, and 3D textured perovskite assemblies (i.e., cuboid‐like, inverse opal‐like, coral‐like, or maze‐like morphologies, etc.), are highlighted to demonstrate their fascinating properties and outstanding capabilities for efficient optoelectronic applications. Finally, a perspective on the remaining challenges and future directions of fabricating unique perovskite morphologies for next‐generation high‐performance optoelectronic devices is provided.

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Section: Diverse Perovskite Morphologies For Optoelectronic Applicationsmentioning

confidence: 99%

A Review of Diverse Halide Perovskite Morphologies for Efficient Optoelectronic Applications

Zhang

Kuang

2019

Small Methods

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“…The research of NPL LEDs is limited by the poor performance of the materials. Zhang et al reported the first NPL‐based LED with an EL peak of 480 nm . As NPLs have a large surface area and volume ratio, they will be more susceptible to surface defects.…”

Section: Blue Perovskite Ledsmentioning

confidence: 99%

“…Zhang et al reported the first NPL-based LED with an EL peak of 480 nm. 112 As NPLs have a large surface area and volume ratio, they will be more susceptible to surface defects. In addition, the reduction in thickness increases the scattering rate of excitons, thereby increasing nonradiative recombination.…”

Section: All Bromide-based Nc-based Ledsmentioning

confidence: 99%

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Fang

Zhang

Yuan

et al. 2019

InfoMat

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Perovskite based light‐emitting diodes (PeLEDs) have become a powerful candidate for next‐generation solid‐state lightings and high‐definition displays due to their high photoluminescence quantum yield (PLQY), tunable emission wavelength over the visible spectrum, and narrow emission linewidths. Over the past few years, the development of red‐ and green‐emissive PeLEDs has rapidly increased, and the corresponding external quantum efficiencies (EQE) have exceeded 20%. However, the research progress of blue‐emitting PeLEDs is limited by its poor material quality and inappropriate device structure. Currently, the maximum EQE of blue PeLED is only 6.2%, which is far from the industrialization requirements. In order to promote the development of blue PeLEDs, we summarize the recent research progress of blue perovskite materials and LEDs and discuss several fatal challenges, mainly embodied in low efficiency and poor stability. In order to overcome these challenges, detailed analysis and strategies are put forward in terms of the materials and devices. For the former, we summarize the feasible strategy for the preparation of efficient and stable blue‐emissive perovskites using component engineering. For the latter, we analyze the advantages and limitations of the different strategies for blue‐emissive perovskite in LEDs. At the end of the review, a comprehensive outlook is detailed, including future development directions and several technical problems to be solved. Thus, we aim to highlight the significance and promote the industrialization of PeLEDs.

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“…The efficiency of NPL devices is largely limited by the poor film coverage on the substrates, which would lead to severe current leakage. In order to improve the surface coverage of the NPLs and further enhance optoelectronic device metrics, Zhang's group prepared the high‐quality NPLs in large scale of 0.25 L per batch . This presented nearly the tenfold improved EQE value of 0.1% over previously reported blue NPL‐LEDs (Figure c).…”

Section: Perovskite Nanoplatelet‐based Blue Ledsmentioning

confidence: 99%

Section: Perovskite Nanoplatelet‐based Blue Ledsmentioning

confidence: 99%

Pure Bromide‐Based Perovskite Nanoplatelets for Blue Light‐Emitting Diodes

et al. 2019

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Metal halide perovskites witness a huge development in light‐emitting diodes (LEDs) triggered by their unique optical and optoelectronic properties. However, blue emission perovskite LEDs lag behind their red and green counterparts in efficiency, due to the difficulties in synthesizing stable materials and maintaining quantum efficiency in thin films as high as in solution. The nanoplatelets (NPLs), with exciton binding energies up to several hundreds of meV, exhibit fundamentally different excitonic behavior from 0D nanocrystals. Meanwhile the bandgap tunability with thickness makes them promising for blue optoelectronic devices. Here, a brief review on recent progress in perovskite light emission, and the opportunities and challenges in pure bromide‐based perovskite NPLs for the blue‐emitting regime are provided. In particular, the important roles of surface ligands and emitting layer quality on devices are highlighted. The trade‐off between well surface passivation and efficient charge transportation is analyzed. Furthermore, it is recommended that more efforts should be put on exploring the carrier dynamics in NPLs, which act as guidelines for optimization of materials and improvement of devices.

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Large-scale synthesis of ultrathin cesium lead bromide perovskite nanoplates with precisely tunable dimensions and their application in blue light-emitting diodes

Cited by 160 publications

References 48 publications

A Review of Diverse Halide Perovskite Morphologies for Efficient Optoelectronic Applications

A Review of Diverse Halide Perovskite Morphologies for Efficient Optoelectronic Applications

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Pure Bromide‐Based Perovskite Nanoplatelets for Blue Light‐Emitting Diodes

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