Effects of Polymer Matrix and Atmospheric Conditions on Photophysical Properties of a Cesium Lead Bromide (CsPbBr3) Perovskite Quantum Dot DOI
Jaesang Yu,

Jinwoong Jo,

Hyeyoung Joung

и другие.

The Journal of Physical Chemistry Letters, Год журнала: 2024, Номер 16(1), С. 384 - 395

Опубликована: Дек. 31, 2024

Understanding the environment-dependent stability and photoluminescence (PL) properties of advanced perovskite materials remains a challenge with conflicting views. Herein, we investigated influence host matrix (poly(methyl methacrylate) (PMMA) polystyrene (PS)) atmospheric conditions (ambient N2) on PL CsPbBr3 quantum dot (PQD) using single-particle spectroscopy. Despite same blinking mechanism, PQD were considerably affected by environmental conditions. The charge trapping detrapping rates lower higher, respectively, under ambient atmosphere than N2 owing to surface defect passivation oxygen. frequency rate decomposition higher in PMMA PS an atmosphere. achieved superior encapsulation its affinity toward hydrophobic ligands because aromatic rings, thereby protecting from moisture thus inhibiting decomposition.

Язык: Английский

Hot Carrier Trapping in Light‐Soaked Mixed Phase CsPbI3 Perovskite Nanocrystals DOI Open Access

Mrinal Kanti Panda,

Debopam Acharjee,

Asit Baran Mahato

и другие.

Advanced Optical Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 13, 2025

Abstract Red‐emitting CsPbI 3 perovskite nanocrystals (r‐PNCs) are considered promising for device applications due to their low bandgap. However, practical use is hindered by significant photoluminescence (PL) intermittency and light‐induced phase transitions. Specifically, the stable bright α‐phase of r‐PNCs quickly converts into weakly emissive mixed‐phase (δ γ) within hours under UV irradiation. In absence light, synthesized using an advanced method have been shown maintain brightness over 20 days. This study explores PL better understand carrier dynamics nature trap states in both mixed phases. These results indicate that r‐PNCs, despite apparent stability, undergo rapid deformation during a blinking experiment, as evidenced decrease average ON state intensity trajectories change XRD patterns. Fluorescence‐lifetime‐intensity‐distribution (FLID) mapping from studies, combined with fluorescence lifetime correlation spectroscopy (FLCS), reveals freshly prepared exhibit behavior primarily governed short‐lived near band edge. dynamic function multiple non‐radiative recombination centers (MRCs). contrast, light‐soaked develop long‐lived deep states, leading dispersive predominantly caused hot (HC) recombination.

Язык: Английский

Процитировано

1
Evidence of Carrier Diffusion between Emission States in CdSe/ZnS Core-Shell Quantum Dots: A Comprehensive Investigation Combining Fluorescence Lifetime Correlation Spectroscopy (FLCS) and Single Dot Photoluminescence Studies DOI

Debopam Acharjee,

Mrinal Kanti Panda,

Asit Baran Mahato

и другие.

Nanoscale, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

At low excitation power, band-edge trap states cause blinking in CdSe/ZnS QDs, showing linear FLID plot. high is driven by both Auger and recombination, leading to a complex pattern.

Язык: Английский

Процитировано

4
Unveiling the Influence of Brightness Heterogeneity in Fluorescence Correlation Spectroscopy of Perovskite Nanocrystals DOI

Mrinal Kanti Panda,

Debopam Acharjee,

Nilanjana Nandi

и другие.

Chemistry - A European Journal, Год журнала: 2024, Номер unknown

Опубликована: Июль 10, 2024

Nanoparticles (NPs), including perovskite nanocrystals (PNCs) with single photon purity, present challenges in fluorescence correlation spectroscopy (FCS) studies due to their distinct photoluminescence (PL) behaviors. In particular, the zero-time amplitude [g

Язык: Английский

Процитировано

4
CsPbBr3 Perovskite Crack Platelet Nanocrystals and Their Biexciton Generation DOI
Suman Bera, Akash Tripathi,

Timi Titus

и другие.

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(29), С. 20300 - 20311

Опубликована: Июль 15, 2024

Lead halide perovskite nanocrystals have been extensively studied in recent years as efficient optical materials for their bright and color-tunable emissions. However, these are mostly confined to 3D limited the anisotropic nanostructures. By exploring Cs-sublattice-induced metal(II) ion exchange with Pb(II), crack CsPbBr

Язык: Английский

Процитировано

4
Synergistic Mitigation of Phase Segregation and Blinking Suppression Along with Enhanced Electrocatalytic Activity in CsPbBrI2 Perovskite Nanocrystals via Ascorbic Acid Surface Treatment DOI
Subarna Biswas,

Mrinal Kanti Panda,

Shovon Chatterjee

и другие.

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 13, 2025

Abstract Mixed‐halide CsPbBrI 2 perovskite nanocrystals (PNC) exhibit defect tolerance and a low bandgap, making them promising for optoelectronic, photovoltaic, catalytic applications. However, their performance is hindered by phase instability under light exposure electrical bias, driven iodine expulsion, which disrupts charge transport further exacerbated trap‐mediated intense photoluminescence (PL) blinking. This study investigates the nature of these trap states role in carrier recombination through ensemble‐ single‐particle‐level analyses. These findings highlight critical passivating ligands stabilizing PNCs, identifying ascorbic acid (AA) as an optimal surface passivation due to its multidentate binding capability, supported DFT calculations. Trion blinking untreated PNCs indicates presence long‐lived states, whereas AA‐treated retain only shallow traps near band edges, exclusively band‐edge (BC) double ON fraction PL trajectories remain stable over 90 days ambient conditions. By effectively deep traps, AA treatment suppresses trapping, mitigates segregation, enhances transport. Leveraging improvements, are employed first time electro/photoelectro‐catalysts reduction 4‐nitrophenol, exhibiting exceptional performance.

Язык: Английский

Процитировано

0
Fluorescence Lifetime Imaging Microscopy: Advances in Materials Science Research DOI
Fariyad Ali, Subhankar Kundu

Chemistry of Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 27, 2025

Язык: Английский

Процитировано

0
Non-Convergence of Blinking Timescale of Twelve-Faceted Perovskite Nanocrystals Observed through Scanning Fluorescence Correlation Spectroscopy (sFCS) Study DOI Creative Commons

Debopam Acharjee,

Asit Baran Mahato,

Mrinal Kanti Panda

и другие.

Опубликована: Июнь 6, 2024

Single-particle photoluminescence (PL) measurements have been extensively utilized to investigate the charge carrier dynamics and recombination processes in quantum dots (QDs). Among these techniques, single dot blinking studies are effective for probing relatively slower with timescales >10 milliseconds (ms), whereas fluorescence correlation spectroscopy (FCS) suited recording faster typically <1 ms. In this study, we scanning FCS (sFCS) bridge ms gap, thereby enabling tracking of across an extended temporal window ranging from microsecond (µs) subsecond. We compared our sFCS data recorded on surface-immobilized twelve-faceted CsPbBr3 dodecahedron perovskite nanocrystals (d-PNCs) that solution phase revealing qualitatively similar yet quantitatively different results. Latter is primarily attributed significantly varying immediate environments PNCs two as well lengths observation windows available dynamics. The most intriguing finding study lies non-converging behavior timescale (τR) even sFCS, despite technique providing size (≤440 ms) studying attribute PL following power law statistics. consequence includes mean ON/OFF duration persuasive experimental integration time, making occur all timescales.

Язык: Английский

Процитировано

2
Halide Perovskite Nanocrystals for Shaping Pt Nanostructures DOI

Rajdeep Das,

A. Patra, Sumit Kumar Dutta

и другие.

Chemistry of Materials, Год журнала: 2024, Номер 36(15), С. 7406 - 7417

Опубликована: Июль 31, 2024

Halide contents in the reaction system during formation of lead halide perovskite nanocrystals remained a critical parameter for controlling their surface facets and optical properties. In addition, herein, impact ions has also been explored as deciding factor metal(0)-perovskite nanocrystal heterostructures. Using CsPbBr3 Pt, it is observed that minimum bromide concentration ideal epitaxial connection Pt particles, but with greater amount, these are disconnected annealing. acted here catalyst nucleating shaping which on altering parameters tuned shape from small dots to cubes rod shape. The control obtaining one-to-one or one-to-many types heterostructures, well excess particles retained bulk solution, established. Formation all shapes further related host nanocrystals, without no such structures seen reactions. This catalytic nucleation retention ejection correlated extent growth between two materials. Hence, rather than using traditional approach, CsBr transformation protocol used required halides system, phenacyl bringing tuning nanocrystals. Details studies investigated facets, sizes,

Язык: Английский

Процитировано

2
Investigation of Carrier Dynamics in CdSe/ZnS Core–Shell Quantum Dots via Scanning Fluorescence Correlation Spectroscopy DOI

Asit Baran Mahato,

Debopam Acharjee,

Mrinal Kanti Panda

и другие.

The Journal of Physical Chemistry C, Год журнала: 2024, Номер 128(39), С. 16588 - 16596

Опубликована: Сен. 24, 2024

Язык: Английский

Процитировано

1
Effects of Polymer Matrix and Atmospheric Conditions on Photophysical Properties of a Cesium Lead Bromide (CsPbBr3) Perovskite Quantum Dot DOI
Jaesang Yu,

Jinwoong Jo,

Hyeyoung Joung

и другие.

The Journal of Physical Chemistry Letters, Год журнала: 2024, Номер 16(1), С. 384 - 395

Опубликована: Дек. 31, 2024

Understanding the environment-dependent stability and photoluminescence (PL) properties of advanced perovskite materials remains a challenge with conflicting views. Herein, we investigated influence host matrix (poly(methyl methacrylate) (PMMA) polystyrene (PS)) atmospheric conditions (ambient N2) on PL CsPbBr3 quantum dot (PQD) using single-particle spectroscopy. Despite same blinking mechanism, PQD were considerably affected by environmental conditions. The charge trapping detrapping rates lower higher, respectively, under ambient atmosphere than N2 owing to surface defect passivation oxygen. frequency rate decomposition higher in PMMA PS an atmosphere. achieved superior encapsulation its affinity toward hydrophobic ligands because aromatic rings, thereby protecting from moisture thus inhibiting decomposition.

Язык: Английский

Процитировано

1