Dominant non-radiative recombination in perovskite CsPbBr3-xIx quantum dots

Solis, Omar E.; Rivas, Jesús Manuel; Duran-Ledezma, Angel A.; González-Cisneros, A.; García‐Rocha, M.; Esparza, Diego

doi:10.1016/j.matlet.2021.129392

Cited by 9 publications

(5 citation statements)

References 42 publications

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“…where τ 1 and τ 2 are the lifetimes of radiative recombination and non-radiative recombination, respectively. 26 The above results show that the lifetime of CaF 2 :7%Ce,7%Tb nanospheres is the longest, which illustrates that the proportion of radiation transition is the highest for CaF 2 :7%Ce,7%Tb nanospheres in the exciton recombination process, and this also explains the reason why the fluorescence intensity of CaF 2 :7%…”

Section: Resultsmentioning

confidence: 71%

Highly efficient and stable red perovskite quantum dots through encapsulation and sensitization of porous CaF₂:Ce,Tb nanoarchitectures

et al. 2022

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Section: Resultsmentioning

confidence: 71%

Highly efficient and stable red perovskite quantum dots through encapsulation and sensitization of porous CaF₂:Ce,Tb nanoarchitectures

et al. 2022

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“…Time-resolved photoluminescence (TRPL) measurements of the Sr-QD layers at room temperature were performed to investigate the dynamics of the charge carriers, as shown in Figure e. The decay curves were fitted to a double exponential function I ( t ) as follows: I ( t ) = A 1 exp ( − t / τ f ) + A 2 exp ( − t / τ s ) where τ f and τ s are the corresponding fast (non-radiative recombination) and slow (radiative recombination) components of lifetime, respectively. , For Sr-QDs, the decay was dominated by radiative recombination, which is strongly correlated to the nature of the states . The radiative recombination rate ( R R ) and non-radiative recombination rate ( R NR ) were calculated as shown in Table .…”

Section: Resultsmentioning

confidence: 99%

“…where τ f and τ s are the corresponding fast (non-radiative recombination) and slow (radiative recombination) components of lifetime, respectively. 32,33 For Sr-QDs, the decay was dominated by radiative recombination, which is strongly correlated to the nature of the states. 34 The radiative recombination rate (R R ) and non-radiative recombination rate (R NR ) were calculated as shown in Table 1.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Controllable Layer-By-Layer CdSe/ZnS Quantum-Dot Thin Films for Enhanced Performance of Light-Emitting Diodes and Photodetectors

Kim

Cho

Hyun

et al. 2023

ACS Appl. Nano Mater.

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We developed a promising deposition method for fabricating controllable layer-by-layer (LbL) quantum-dot (QD) structures. We introduced a spray coating method to induce desired properties of QD thin films as well as to control the thickness of QD layers. An intermediate heat treatment was applied between spray pass cycles to induce rapid evaporation of the surface ligands and solvent in the QD solution, which successfully prevents the formation of clusters on spray-coated QD (Sr-QD) films. Furthermore, we observed that the LbL structure of Sr-QDs has fewer surface defects and better crystallinity, leading to improved performance of optoelectronic devices compared to conventional solution-processed devices. Thus, our study suggests that this spray coating process enables detailed control of the properties and thickness of the QD films due to the highly controllable LbL structure of QD monolayers (MLs).

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“…[16,17] This is mainly due to the nonradiative recombinations in HPs. [18] Furthermore, the Cs 4 PbBr 6 has higher PLQY compared with Cs 4 PbI 6 and Cs 4 PbCl 6 perovskites. [19] Yet, pure Cs 4 PbBr 6 is transparent in visible light.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Activity of Cs₄PbBr₆/WS₂ Hybrid Nanocomposite

Immanuel,

Huang,

Taank

et al. 2023

Adv Energy and Sustain Res

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Photocatalytic processes are among the prime means for mitigating the pollution caused by toxic effluents. In this context, photocatalysis presents a promising path and is undergoing rapid evolution. Halide perovskite‐nanocrystals (HP‐NCs) are excellent candidates due to their negative conduction band minimum and low work function, essential for photocatalysis. Yet, HP‐NCs face limitations within this domain because they are prone to chemical degradation when exposed to external factors like high temperature, polar solvents, oxygen, and light. A practical approach toward stabilizing HP‐NCs involves hybridizing them with a chemically inert material that can provide steric stabilization and act as a cocatalyst. Transition‐metal dichalcogenides emerge as outstanding candidates to sterically stabilize the HPs as they are stable, chemically inert, and can serve as co‐catalysts, enabling suppressed charge recombination. Herein, the photocatalytic performance of Cs4PbBr6/WS2‐nanocomposites towards organic dye degradation in polar solvents under visible light illumination is investigated. We found that the presence of WS2 nanostructures significantly stabilizes the HP‐NCs and promotes dye degradation rate compared to pristine Cs4PbBr6‐NCs. Using transient absorption measurements, we found that the WS2‐nanostructures act as an electron transport channel, effectively reducing charge recombination in the NCs. These findings pave the way for implementing Cs4PbBr6/WS2‐nanocomposites as stable and superior photocatalysts.

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Dominant non-radiative recombination in perovskite CsPbBr3-xIx quantum dots

Cited by 9 publications

References 42 publications

Highly efficient and stable red perovskite quantum dots through encapsulation and sensitization of porous CaF₂:Ce,Tb nanoarchitectures

Highly efficient and stable red perovskite quantum dots through encapsulation and sensitization of porous CaF₂:Ce,Tb nanoarchitectures

Controllable Layer-By-Layer CdSe/ZnS Quantum-Dot Thin Films for Enhanced Performance of Light-Emitting Diodes and Photodetectors

Enhanced Photocatalytic Activity of Cs₄PbBr₆/WS₂ Hybrid Nanocomposite

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Dominant non-radiative recombination in perovskite CsPbBr3-xIx quantum dots

Cited by 9 publications

References 42 publications

Highly efficient and stable red perovskite quantum dots through encapsulation and sensitization of porous CaF2:Ce,Tb nanoarchitectures

Highly efficient and stable red perovskite quantum dots through encapsulation and sensitization of porous CaF2:Ce,Tb nanoarchitectures

Controllable Layer-By-Layer CdSe/ZnS Quantum-Dot Thin Films for Enhanced Performance of Light-Emitting Diodes and Photodetectors

Enhanced Photocatalytic Activity of Cs4PbBr6/WS2 Hybrid Nanocomposite

Contact Info

Product

Resources

About

Highly efficient and stable red perovskite quantum dots through encapsulation and sensitization of porous CaF₂:Ce,Tb nanoarchitectures

Highly efficient and stable red perovskite quantum dots through encapsulation and sensitization of porous CaF₂:Ce,Tb nanoarchitectures

Enhanced Photocatalytic Activity of Cs₄PbBr₆/WS₂ Hybrid Nanocomposite