In-situ TiO2-Coated CsPbBr3 quantum dots with enhanced stability, photoluminescence quantum yields, and charge transport properties

Nuket, Parina; Akaishi, Yuji; Yoshimura, Gimpei; Kida, Tetsuya; Vas-Umnuay, Paravee

doi:10.1016/j.ceramint.2022.07.196

Cited by 9 publications

(9 citation statements)

References 25 publications

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“…After 30 min, OA‐CsPbBr 3 PQDs was almost completely quenched, and the luminescence peak was obviously redshifted, which was related to quantum dot agglomeration. [ 26 ] As shown in Figure 2b, the luminescence intensity of BVA‐CsPbBr 3 PQDs fully exposed to water remained at 92% of the initial intensity after 30 min. In PL test lasting hundreds of hours, BVA‐CsPbBr 3 PQDs did not weaken to 7% of the initial strength until 130 h later.…”

Section: Resultsmentioning

confidence: 95%

Surface Modification Strategy Synthesized CsPbX₃ Perovskite Quantum Dots with Excellent Stability and Optical Properties in Water

Song

Cao

et al. 2023

Adv Funct Materials

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The poor stability of CsPbX3 (X = Cl, Br, I) perovskite quantum dots (PQDs) in polar solvents such as water, seriously hinders their practical application. Herein, 5‐Bromovaleric acid (BVA) is used to replace oleic acid (OA), the most common surface ligand in CsPbX3 PQDs synthesis. Under the synergic action of oleylamine (OLA), CsPbX3 PQDs with high water stability can be synthesized directly in water. Because the carboxyl ligands provided by BVA, and the long chain amines provided by OLA formed hydrophobic shells on the surface of CsPbBr3 PQDs, the obtained CsPbBr3 PQDs still has high luminescence intensity and photoluminescence quantum yield after being dispersed in water for several days, and the luminescence peak is always maintained at 518 nm. In contrast, the luminescence intensity of CsPbBr3 PQDs synthesized with OA and OLA is <1% of the initial intensity after only 30 min. CsPbCl3 and CsPbI3 PQDs synthesized directly in water by this method also show high water stability. In this study, for the first time the synthesis method of CsPbX3 PQDs with high water stability using BVA/OLA as surface ligands is proposed, which provides an effective way to explore the synthesis of PQDs that can maintain stability in water.

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Section: Resultsmentioning

confidence: 95%

Surface Modification Strategy Synthesized CsPbX₃ Perovskite Quantum Dots with Excellent Stability and Optical Properties in Water

Song

Cao

et al. 2023

Adv Funct Materials

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“…Halide perovskite materials are widely investigated in solar cells due to their high absorption coefficient, low exciton binding energy, and long carrier diffusion length. [ 1–3 ] Several studies shed light on utilizing halide perovskite quantum dots (P‐QDs) as an effective optoelectronic component for the optical devices. [ 4,5,6 ] Inorganic perovskite quantum dots (QDs) of CsPbX 3 exhibit ultra‐stable stimulated emission with tunable wavelength [ 7 ] and cost‐effective preparation.…”

Section: Introductionmentioning

confidence: 99%

“…Halide perovskite materials are widely investigated in solar cells due to their high absorption coefficient, low exciton binding energy, and long carrier diffusion length. [1][2][3] Several performing Kelvin probe microscopy (KPFM), [28] and conductive atomic force microscopy (c-AFM). [29] The relationship between morphological defects, electrical response, and ion migration behavior of halide organic-inorganic perovskites also has been extensively studied before [30] with such techniques, however, very little work exists to date for quantum dot film samples.…”

Section: Introductionmentioning

confidence: 99%

Morphology‐Dependent Charge Carrier Dynamics and Ion Migration Behavior of CsPbBr₃ Halide Perovskite Quantum Dot Films

Alosaimi

Huang

Sharma

et al. 2023

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Exceptional electronic, optoelectronic, and sensing properties of inorganic Cs‐based perovskites are significantly influenced by the defect chemistry of the material. Although organic halide perovskites that have a polycrystalline structure are heavily studied, understanding of the defect properties at the grain boundaries (GB) of inorganic Cs‐based perovskite quantum dots (QDs) is still limited. Here, morphology‐dependent charge carrier dynamics of CsPbBr3 quantum dots at the nanoscale by performing scanning probe microscopy of thermally treated samples are investigated. The grain boundaries of defect‐engineered samples show higher surface potential than the grain interiors under light illumination, suggesting an effective role of GBs as charge collection and transport channels. The lower density of crystallographic defects and lower trap density at GBs specifically of heat‐treated samples cause insignificant dark current, lower local current hysteresis, and higher photocurrent, than the control samples. It is also shown that the decay rate of surface photovoltage of the heated sample is quicker than the control sample, which implies a considerable impact of ion migration on the relaxation dynamic of photogenerated charge carriers. These findings reveal that the annealing process is an effective strategy to control not only the morphology but also the optoelectrical properties of GB defects, and the dynamic of ion migration. Understanding the origin of photoelectric activity in this material allows for designing and engineering optoelectronic QD devices with enhanced functionality.

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“…12 Another choice is the in situ synthesis of PQDs in polymers, which has become a new research direction. 11,13 In situ synthesis of PQDs via electrospinning technology has the advantages of a simple manufacturing process, realizable batch preparation, and abundant reaction parameter selection, such as types of polymers, precursor concentration, and injection form. 14 For instance, water-resistant polymers like polystyrene can be used for in situ synthesis of PQDs in fibers, which can significantly improve the poor water stability of PQDs.…”

Section: Introductionmentioning

confidence: 99%

“…In the past couple of years, numerous strategies have been explored to enhance the stability of PQDs, such as the construction of inorganic low-dimensional perovskite nanocrystals, surface treatment with hydrophobic and strong electron-absorbing organic molecules, and using polymers or inorganic oxides to encapsulate PQDs. , Encapsulating PQDs with polymers or ceramic glass not only protects PQDs but also facilitates the creation of fluorescent films or glass for practical applications. Normally, PQDs are first prepared by hot injection or coprecipitation and then used for encapsulation, which involves cumbersome procedures .…”

Section: Introductionmentioning

confidence: 99%

Methylammonium Cation-Regulated Controllable Preparation of CsPbBr₃ Perovskite Quantum Dots in Polystyrene Fiber with Enhanced Water and UV Light Stabilities

Wang

Yoo

et al. 2023

Inorg. Chem.

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In situ fabrication of lead halide perovskite quantum dots (PQDs) is important for narrow-band emitters for LED displays due to the simple work procedure and convenient usability; however, the growth of PQDs is not readily controllable in the preparation, resulting in low quantum efficiency and environmental instability of PQDs. Here, we demonstrate an effective strategy to controllably prepare CsPbBr3 PQDs in polystyrene (PS) under the regulation of methylammonium bromide (MABr) via electrostatic spinning and thermal annealing techniques. MA+ slowed down the growth of CsPbBr3 PQDs and acted as a surface defect passivation reagent, which was proved by Gibbs free energy simulation, static fluorescence spectra, transmission electron microscopy, and time-resolved photoluminescence (PL) decay spectra. Among a series of prepared Cs1–x MA x PbBr3@PS (0 ≤ x ≤ 0.2) nanofibers, Cs0.88MA0.12PbBr3@PS shows the regular particle morphology of CsPbBr3 PQDs and the highest photoluminescence quantum yield of up to 39.54%. The PL intensity of Cs0.88MA0.12PbBr3@PS is 90% of the initial intensity after immersing in water for 45 days and 49% of the initial value after persistent ultraviolet (UV) irradiation for 27 days. A high color gamut containing 127% of the National Television Systems Committee standard with long-time working stability was also obtained on light-emitting diode package measurements. These results demonstrate that MA+ can effectively control the morphology, humidity, and optical stability of CsPbBr3 PQDs in the PS matrix.

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In-situ TiO2-Coated CsPbBr3 quantum dots with enhanced stability, photoluminescence quantum yields, and charge transport properties

Cited by 9 publications

References 25 publications

Surface Modification Strategy Synthesized CsPbX₃ Perovskite Quantum Dots with Excellent Stability and Optical Properties in Water

Surface Modification Strategy Synthesized CsPbX₃ Perovskite Quantum Dots with Excellent Stability and Optical Properties in Water

Morphology‐Dependent Charge Carrier Dynamics and Ion Migration Behavior of CsPbBr₃ Halide Perovskite Quantum Dot Films

Methylammonium Cation-Regulated Controllable Preparation of CsPbBr₃ Perovskite Quantum Dots in Polystyrene Fiber with Enhanced Water and UV Light Stabilities

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In-situ TiO2-Coated CsPbBr3 quantum dots with enhanced stability, photoluminescence quantum yields, and charge transport properties

Cited by 9 publications

References 25 publications

Surface Modification Strategy Synthesized CsPbX3 Perovskite Quantum Dots with Excellent Stability and Optical Properties in Water

Surface Modification Strategy Synthesized CsPbX3 Perovskite Quantum Dots with Excellent Stability and Optical Properties in Water

Morphology‐Dependent Charge Carrier Dynamics and Ion Migration Behavior of CsPbBr3 Halide Perovskite Quantum Dot Films

Methylammonium Cation-Regulated Controllable Preparation of CsPbBr3 Perovskite Quantum Dots in Polystyrene Fiber with Enhanced Water and UV Light Stabilities

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Surface Modification Strategy Synthesized CsPbX₃ Perovskite Quantum Dots with Excellent Stability and Optical Properties in Water

Surface Modification Strategy Synthesized CsPbX₃ Perovskite Quantum Dots with Excellent Stability and Optical Properties in Water

Morphology‐Dependent Charge Carrier Dynamics and Ion Migration Behavior of CsPbBr₃ Halide Perovskite Quantum Dot Films

Methylammonium Cation-Regulated Controllable Preparation of CsPbBr₃ Perovskite Quantum Dots in Polystyrene Fiber with Enhanced Water and UV Light Stabilities