Highly efficient and stable CsPbBr<sub>3</sub> perovskite quantum dots by encapsulation in dual-shell hollow silica spheres for WLEDs

Qiu, Lei; Yang, Hang; Dai, Zhenhong; Sun, Fengxu; Hao, Jiarui; Guan, Mengyu; Dang, Peipei; Yan, Chunjie; Lin, Jun; Li, Guogang

doi:10.1039/d0qi00208a

Cited by 47 publications

(48 citation statements)

References 54 publications

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“…Recently, all‐inorganic CsPbX 3 (X = Cl, Br, I) nanocrystals (NCs) have attracted broad attention as promising candidates in light‐emitting diodes (LEDs), [ 3–8 ] solar cells, [ 9–11 ] lasers, [ 12–14 ] and photodetectors, [ 15–17 ] owing to their excellent optoelectronic properties, including high photoluminescence quantum yield (PLQY), wide tunable emission and narrow emission spectrum. [ 18–20 ] The relatively higher stability renders CsPbBr 3 NCs wide research, but the reported ones still suffer from poor heat and moisture stability, limiting their practical applications.…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Synthesis of Stable Zirconia‐Coated CsPbBr₃ Nanocrystals for White Light‐Emitting Diodes and Visible Light Communication

Chen

Cai

et al. 2021

Laser & Photonics Reviews

155

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The photoluminescence quantum yield (PLQY) of CsPbBr3 perovskite nanocrystals (NCs) prepared by the hot‐injection method can exceed 90%, which have attracted intensive attention for white light‐emitting diodes (WLEDs). However, the whole hot‐injection experiment requires air isolation and relatively high temperature. In addition, the poor stability of CsPbBr3 NCs impedes their applications. Here, a facile method is reported to synthesize CsPbBr3@ZrO2 NCs at room temperature in air. Owing to using ZrO2 coated CsPbBr3 NCs, the prepared CsPbBr3@ZrO2 NCs not only present a PLQY of 80% but also exhibit an enhanced stability to heat and moisture. Furthermore, WLEDs are fabricated with CsPbBr3@ZrO2 NCs and commercial red phosphors (CaAlSiN3:Eu2+) on blue LEDs chips. The fabricated WLEDs exhibit a correlated color temperature (CCT) of 4743 K and luminous efficacy as high as 64.0 Lm W–1. In addition, visible light communication with a high data rate of 33.5 Mbps is achieved using the WLEDs. This work provides a room temperature strategy to coat zirconia for CsPbBr3@ZrO2 NCs, benefiting to enhance the optical performance and stability, as well as the promotion of the great potentials in solid‐state illuminating and visible light communication applications.

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Section: Introductionmentioning

confidence: 99%

Room Temperature Synthesis of Stable Zirconia‐Coated CsPbBr₃ Nanocrystals for White Light‐Emitting Diodes and Visible Light Communication

Chen

Cai

et al. 2021

Laser & Photonics Reviews

155

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“…The use of various synthesis strategies has led to a variety of possible structures of the resulting composite nanostructured materials. pNCs can be placed on the outer shell of silica (SiO 2 ) spheres via bonding to ligands [ 7 ]; a hollow matrix can be filled with pNCs [ 8 ]; silica layer can be grown on the pNC leading to the formation of core-shell structure [ 9 ]. Another way to fabricate composites is embedding of pNCs into a porous inert matrix is the straightforward and widely used method to achieve perovskite-based composites with stable performance [ 6 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Interface Chemical Modification between All-Inorganic Perovskite Nanocrystals and Porous Silica Microspheres for Composite Materials with Improved Emission

et al. 2021

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In recent years, there has been rapid progress in the development of photonic devices based on lead halide perovskite nanocrystals since they possess a set of unique optical and charge transport properties. However, the main limiting factor for their subsequent application is poor stability against exposure to adverse environmental conditions. In this work, a study of a composite material based on perovskite CsPbBr3 nanocrystals embedded in porous silica microspheres is presented. We developed two different approaches to change the interface between nanocrystals and the surface of the microsphere pores: surface treatment of (i) nanocrystals or (ii) microspheres. The surface modification with tetraethylorthosilicate molecules not only increased stability but also improved the optical responses of the composite material. The position of the emission band remained almost unchanged, but its lifetime increased significantly compared to the initial value. The improvement of the optical performance via surface modification with tetraethylorthosilicate molecules also works for the lead-free Bi-doped Cs2AgInCl6 double perovskite nanocrystals leading to increased stability of their optical responses at ambient conditions. These results clearly demonstrate the advantage of a composite material that can be used in novel photonic devices with improved performance.

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“…Silica (SiO 2 ) is a versatile material usually treated as a prospective candidate to resolve the long-standing bottleneck stability issue in nanostructure materials 11 , 15 , 16 . We note that the silica encapsulation has been well documented over the last decade using in-situ and ex-situ synthetic routes to enhancing the stability of the PQDs 17 – 21 .…”

Section: Introductionmentioning

confidence: 99%

Synergetic effect of the surface ligand and SiO2 driven photoluminescence stabilization of the CH3NH3PbBr3 perovskite magic-sized clusters

Permatasari

Masitoh

Mahen

et al. 2021

Sci Rep

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Zero-dimensional Perovskite Magic-size Clusters play crucial roles in understanding and controlling nucleation and growth of semiconductor nanoparticles. However, their metastability behavior is a critical hindrance for reliable characterizations. Here, we report the first demonstration of using an excess amount of surface ligand and SiO2 as novel passivation for synthesizing the magic-sized clusters (MSCs) by the Ligand-assisted reprecipitation method. A synergetic effect between an excessed surface ligand and SiO2 inhibits the protonation and deprotonation reaction between amine-based and acid-based ligand, leading to enhanced PL stability. The obtained CH3NH3PbBr3 PMSCs/SiO2 retain 70% of its initial emission intensity in ambient conditions for 20 days. This passivation approach opens an entirely new avenue for the reliable characterizations of CH3NH3PbBr3 PMSCs, which will significantly broaden their application for understanding and controlling nucleation and growth of semiconductor nanoparticles.

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Highly efficient and stable CsPbBr₃ perovskite quantum dots by encapsulation in dual-shell hollow silica spheres for WLEDs

Abstract: A highly stable and efficient CsPbBr3@SiO2 composite phosphor is achieved by protecting the CsPbBr3 QDs from direct exposure to the atmosphere by encapsulating CsPbBr3 into dual-shell hollow silica nanospheres.

Cited by 47 publications

References 54 publications

Room Temperature Synthesis of Stable Zirconia‐Coated CsPbBr₃ Nanocrystals for White Light‐Emitting Diodes and Visible Light Communication

Room Temperature Synthesis of Stable Zirconia‐Coated CsPbBr₃ Nanocrystals for White Light‐Emitting Diodes and Visible Light Communication

Interface Chemical Modification between All-Inorganic Perovskite Nanocrystals and Porous Silica Microspheres for Composite Materials with Improved Emission

Synergetic effect of the surface ligand and SiO2 driven photoluminescence stabilization of the CH3NH3PbBr3 perovskite magic-sized clusters

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Highly efficient and stable CsPbBr3 perovskite quantum dots by encapsulation in dual-shell hollow silica spheres for WLEDs

Abstract: A highly stable and efficient CsPbBr3@SiO2 composite phosphor is achieved by protecting the CsPbBr3 QDs from direct exposure to the atmosphere by encapsulating CsPbBr3 into dual-shell hollow silica nanospheres.

Cited by 47 publications

References 54 publications

Room Temperature Synthesis of Stable Zirconia‐Coated CsPbBr3 Nanocrystals for White Light‐Emitting Diodes and Visible Light Communication

Room Temperature Synthesis of Stable Zirconia‐Coated CsPbBr3 Nanocrystals for White Light‐Emitting Diodes and Visible Light Communication

Interface Chemical Modification between All-Inorganic Perovskite Nanocrystals and Porous Silica Microspheres for Composite Materials with Improved Emission

Synergetic effect of the surface ligand and SiO2 driven photoluminescence stabilization of the CH3NH3PbBr3 perovskite magic-sized clusters

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Product

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Highly efficient and stable CsPbBr₃ perovskite quantum dots by encapsulation in dual-shell hollow silica spheres for WLEDs

Room Temperature Synthesis of Stable Zirconia‐Coated CsPbBr₃ Nanocrystals for White Light‐Emitting Diodes and Visible Light Communication

Room Temperature Synthesis of Stable Zirconia‐Coated CsPbBr₃ Nanocrystals for White Light‐Emitting Diodes and Visible Light Communication