Ultra-stable CsPbBr<sub>3</sub> nanocrystals with near-unity photoluminescence quantum yield <i>via</i> postsynthetic surface engineering

Zu, Yanqing; Dai, Jinfei; Li, Lü; Yuan, Fang; Chen, Xiang; Feng, Zhicun; Li, Kun; Song, Xiaojuan; Yun, Feng; Yu, Yue; Jiao, Bo; Dong, Hua; Hou, Xun; Ju, Ming‐Gang; Wu, Zhaoxin

doi:10.1039/c9ta08421e

Cited by 54 publications

(71 citation statements)

References 42 publications

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“…Reproduced with permission. [ 266 ] Copyright 2019, Royal Society of Chemistry. G) Schematic illustration of the loss of PL intensity in CsPbI 3 NCs due to the acid–base reaction between OA and OAm (right) and PL recovery upon introduction of TOP (left).…”

Section: Postsynthetic Ligand Modifications In Lhp Ncsmentioning

confidence: 99%

“…[ 273 ] In another example, 1,3‐adamantanedicarboxylic acid (ADA) was added along with ZnBr 2 to a colloidal solution of CsPbBr 3 NCs to enhance the PL QY. [ 266 ] Specifically, this dual passivation strategy renders the PL QY close to unity (97.1%) and facilitates enhanced stability (only 7% decrease in PL QY following 65 days storage). [ 266 ] The ADA ligand is able to passivate Br – vacancies which lead to trap states in the bandgap.…”

Section: Postsynthetic Ligand Modifications In Lhp Ncsmentioning

confidence: 99%

“…[ 266 ] Specifically, this dual passivation strategy renders the PL QY close to unity (97.1%) and facilitates enhanced stability (only 7% decrease in PL QY following 65 days storage). [ 266 ] The ADA ligand is able to passivate Br – vacancies which lead to trap states in the bandgap. [ 266 ] DFT calculations showed that ADA was able to passivate one (Figure 7E) or two (Figure 7F) Br – vacancies, resulting in a fully delocalized valence band maximum (VBM) and conduction band minimum (CBM) with trap‐free bandgaps.…”

Section: Postsynthetic Ligand Modifications In Lhp Ncsmentioning

confidence: 99%

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Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals

et al. 2021

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Lead halide perovskite (LHP) nanocrystals (NCs) have recently garnered enhanced development efforts from research disciplines owing to their superior optical and optoelectronic properties. These materials, however, are unlike conventional quantum dots, because they possess strong ionic character, labile ligand coverage, and overall stability issues. As a result, the system as a whole is highly dynamic and can be affected by slight changes of particle surface environment. Specifically, the surface ligand shell of LHP NCs has proven to play imperative roles throughout the lifetime of a LHP NC. Recent advances in engineering and understanding the roles of surface ligand shells from initial synthesis, through postsynthetic processing and device integration, finally to application performances of colloidal LHP NCs are covered here.

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Section: Postsynthetic Ligand Modifications In Lhp Ncsmentioning

confidence: 99%

Section: Postsynthetic Ligand Modifications In Lhp Ncsmentioning

confidence: 99%

Section: Postsynthetic Ligand Modifications In Lhp Ncsmentioning

confidence: 99%

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Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals

et al. 2021

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“…It is known that the dangling bonds and atomic vacancy may introduce obvious mid-gaps states inside the band gap of QDs which serve as the non-radiative recombination sites. Core-shell structure confinement and surface ligands passivation were commonly used to eliminate such trap states for both traditional cadmium or lead-based and halide perovskite QDs [96][97][98] . However, the ligands are easy to fall off and defects are prone to form when QDs are built into thin films.…”

Section: (Iii) and (Iv)mentioning

confidence: 99%

“…Besides the degradation from light and heat, QDs are also susceptible to water and oxygen which are inevitably present in the ambient environment when used in lighting or display applications. Water and oxygen molecules are prone to oxidize surface atoms, leading to outer shell oxidation 108 or crystal structure decomposition 98 . II-VI and IV-VI traditional QDs are easy to fail since surface atoms are very sensitive to oxygen.…”

Section: Stability Improvementmentioning

confidence: 99%

Atomic layer deposition for quantum dots based devices

Zhou

Liu

Wen

et al. 2020

Opto-Electronic Advances

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Quantum dots (QDs) are promising candidates for the next-generation optical and electronic devices due to the outstanding photoluminance efficiency, tunable bandgap and facile solution synthesis. Nevertheless, the limited optoelectronic performance and poor lifetime of QDs devices hinder their further applications. As a gas-phase surface treatment method, atomic layer deposition (ALD) has shown the potential in QDs surface modification and device construction owing to the atomic-level control and excellent uniformity/conformality. In this perspective, the attempts to utilize ALD techniques in QDs modification to improve the photoluminance efficiency, stability, carrier mobility, as well as interfacial carrier utilization are introduced. ALD proves to be successful in the photoluminance quantum yield (PLQY) enhancement due to the elimination of QDs surface dangling bonds and defects. The QDs stability and devices lifetime are improved greatly through the introduction of ALD barrier layers. Furthermore, the carrier transport is ameliorated efficiently by infilling interstitial spaces during ALD process. Attributed to the ultra-thin and dense coating on the interface, the improvement on optoelectronic performance is achieved. Finally, the challenges of ALD applications in QDs at present and several prospects including ALD process optimization, in-situ characterization and computational simulations are proposed.

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Electrospun Electroluminescent CsPbBr₃ Fibers as Flexible Perovskite Networks for Light‐Emitting Application

et al. 2023

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Thin‐film perovskite light‐emitting diodes have gained increasing attention in the last 6 years. With the possibility to process the emitting layer from solution, the way for 1D morphology of the semiconductor for flexible devices is paved. Herein, for the first time single‐step fabrication of CsPbBr3@PVP nanofibers in a customized electrospinning process performed under ambient conditions from a water‐based precursor solution is reported. The water‐based approach allows the incorporation of a conductive polymer into the compound fiber by blending the perovskite precursor ink with commercially available PEDOT:PSS dispersion. The results demonstrate electrospun fiber mats which are stable at ambient conditions for at least 5 months and can be utilized in electroluminescence devices. Photoluminescence studies on the perovskite fibers reveal a blueshift of the emission peak compared to thin films possibly due to the generation of nanocrystals of ≈12 nm by in situ nanocrystal pinning as confirmed by transmission electron microscopy. A proof‐of‐concept electrically pumped light‐emitting device is built with the obtained fiber mat. The perovskite nanofibers offer promising applications in flexible and stretchable optoelectronics.

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Ultra-stable CsPbBr₃ nanocrystals with near-unity photoluminescence quantum yield via postsynthetic surface engineering

Abstract: ADA + ZnBr2 passivated CsPbBr3 nanocrystals possess high photoluminescence quantum yield and good stability before and after storage for 65 days.

Cited by 54 publications

References 42 publications

Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals

Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals

Atomic layer deposition for quantum dots based devices

Electrospun Electroluminescent CsPbBr₃ Fibers as Flexible Perovskite Networks for Light‐Emitting Application

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Ultra-stable CsPbBr3 nanocrystals with near-unity photoluminescence quantum yield via postsynthetic surface engineering

Abstract: ADA + ZnBr2 passivated CsPbBr3 nanocrystals possess high photoluminescence quantum yield and good stability before and after storage for 65 days.

Cited by 54 publications

References 42 publications

Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals

Recent Advances in Ligand Design and Engineering in Lead Halide Perovskite Nanocrystals

Atomic layer deposition for quantum dots based devices

Electrospun Electroluminescent CsPbBr3 Fibers as Flexible Perovskite Networks for Light‐Emitting Application

Contact Info

Product

Resources

About

Ultra-stable CsPbBr₃ nanocrystals with near-unity photoluminescence quantum yield via postsynthetic surface engineering

Electrospun Electroluminescent CsPbBr₃ Fibers as Flexible Perovskite Networks for Light‐Emitting Application