Exciton localization in doped perovskite nanocrystals enhances intrinsic radiative recombination

2021 ◽  
Author(s):  
Sascha Feldmann ◽  
Mahesh Gangishetty ◽  
Ivona Bravić ◽  
Timo Neumann ◽  
Bo Peng ◽  
...  
Keyword(s):  
Radiative Recombination ◽  
Perovskite Nanocrystals ◽  
Exciton Localization

scholarly journals Photoluminescent Spectral Broadening of Lead Halide Perovskite Nanocrystals Investigated by Emission Wavelength Dependent Lifetime

Molecules ◽  
2020 ◽  
Vol 25 (5) ◽  
pp. 1151 ◽  
Author(s):  
Jinlei Zhang ◽  
Jiuyang He ◽  
Lun Yang ◽  
Zhixing Gan
Keyword(s):  
Radiative Recombination ◽  
Deep Understanding ◽  
Spectral Broadening ◽  
Time Resolved ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Recombination Processes ◽  
Energy Relaxation Time ◽  
Halide Perovskite ◽  
Lead Halide

Despite intensive efforts, the fluorescence of perovskite nanocrystals (NCs) still suffers from a poor color purity, which limits the applications in light emitting and multicolor display. A deep understanding on the fundamental of the photoluminescent (PL) spectral broadening is thus of great significance. Herein, the PL decay curves of the CsPbClxBr3-x NCs are monitored at different wavelengths covering the entire PL band. Moreover, energy relaxation time τ and radiative recombination time β are obtained by numerical fittings. The dependences of τ and 1/β on the detection wavelength agree well with the steady-state PL spectrum, indicating the observed PL broadening is an intrinsic effect due to the resonance and off-resonance exciton radiative recombination processes. This work not only provides a new analysis method for time-resolved PL spectra of perovskites, but also gains a deep insight into the spectral broadening of the lead halide perovskite NCs.

scholarly journals Charge Carrier Localization in Doped Perovskite Nanocrystals Enhances Radiative Recombination

2021 ◽  
Author(s):  
Sascha Feldmann ◽  
Mahesh K. Gangishetty ◽  
Ivona Bravić ◽  
Timo Neumann ◽  
Bo Peng ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Radiative Recombination ◽  
Carrier Localization ◽  
Perovskite Nanocrystals

EXCITON LOCALIZATION IN (Cd,Zn)O EPILAYERS AND (Cd,Zn)O/(Mg,Zn)O MULTI-QUANTUM WELLS ON LATTICE-MATCHED SUBSTRATES

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3853-3856 ◽  
Author(s):  
T. MAKINO ◽  
N. T. TUAN ◽  
C. H. CHIA ◽  
Y. SEGAWA ◽  
M. KAWASAKI ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Radiative Recombination ◽  
Molecular Beam ◽  
Radiative Lifetime ◽  
Phonon Coupling ◽  
Time Resolved ◽  
Exciton Localization ◽  
Photoluminescence Studies ◽  
Time Resolved Photoluminescence ◽  
Lattice Matched

We report on optical properties of epitaxial (Cd,Zn)O layers and multi-quantum wells grown by laser molecular-beam epitaxy on lattice-matched ScAlMgO 4 substrates. Exciton-phonon coupling strength in (Cd,Zn)O layers estimated by temperature dependence of the excitonic energy was similar to that deduced in ZnO . Time-resolved photoluminescence studies were performed on the multi-quantum wells, which are almost perfectly lattice-matched (0.034%). Radiative recombination of excitons exhibits a spectral distribution of times. We found that the radiative lifetime increases linearly with temperature, showing a two-dimensional feature of excitons in quantum wells.

Iron K-Line Emission from X-Ray Binaries

1988 ◽  
Vol 102 ◽  
pp. 47-50
Author(s):  
K. Masai ◽  
S. Hayakawa ◽  
F. Nagase
Keyword(s):  
Accretion Disk ◽  
Radiative Recombination ◽  
Characteristic Temperature ◽  
Line Emission ◽  
Ionization Front ◽  
Continuum Radiation ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

AbstractEmission mechanisms of the iron Kα-lines in X-ray binaries are discussed in relation with the characteristic temperature Txof continuum radiation thereof. The 6.7 keV line is ascribed to radiative recombination followed by cascades in a corona of ∼ 100 eV formed above the accretion disk. This mechanism is attained for Tx≲ 10 keV as observed for low mass X-ray binaries. The 6.4 keV line observed for binary X-ray pulsars with Tx> 10 keV is likely due to fluorescence outside the He II ionization front.

Ultrafast photo-induced processes in perovskite nanocrystals

2020 ◽  
Author(s):  
Goutam Ghosh ◽  
Amitava Patra ◽  
Arnab Ghosh ◽  
Srijon Ghosh
Keyword(s):  
Perovskite Nanocrystals

EXCITON LOCALIZATION BY COMPOSITIONAL FLUCTUATIONS IN II-VI SEMICONDUCTOR SOLID SOLUTIONS

1985 ◽  
Vol 46 (C7) ◽  
pp. C7-173-C7-177 ◽  
Author(s):  
S. Permogorov ◽  
A. Reznitsky ◽  
S. Verbin ◽  
A. Naumov ◽  
W. von der Osten ◽  
...  
Keyword(s):  
Solid Solutions ◽  
Exciton Localization

Radiative recombination in semiconductors

1959 ◽  
Vol 68 (6) ◽  
pp. 247-260 ◽  
Author(s):  
V.S. Vavilov
Keyword(s):  
Radiative Recombination

Formation of Luminescent Si Nanocrystals by High-Temperature Annealing of Ion-Beam-Sputtered Si/SiO2 Multilayers

2003 ◽  
Vol 775 ◽  
Author(s):  
Suk-Ho Choi ◽  
Jun Sung Bae ◽  
Kyung Jung Kim ◽  
Dae Won Moon
Keyword(s):  
Quantum Confinement ◽  
Radiative Recombination ◽  
Ion Beam ◽  
Quantum Confinement Effect ◽  
Visible Range ◽  
Ion Beam Sputtering ◽  
Transmission Electron ◽  
Si Nanocrystals ◽  
Beam Sputtering ◽  
Microscopy Images

AbstractSi/SiO2 multilayers (MLs) have been prepared under different deposition temperatures (TS) by ion beam sputtering. The annealing at 1200°C leads to the formation of Si nanocrystals in the Si layer of MLs. The high resolution transmission electron microscopy images clearly demonstrate the existence of Si nanocrystals, which exhibit photoluminescence (PL) in the visible range when TS is ≥ 300°C. This is attributed to well-separation of nanocrystals in the higher-TS samples, which is thought to be a major cause for reducing non-radiative recombination in the interface between Si nanocrystal and surface oxide. The visible PL spectra are enhanced in its intensity and are shifted to higher energy by increasing TS. These PL behaviours are consistent with the quantum confinement effect of Si nanocrystals.

Hollow Metal Halide Perovskite Nanocrystals with Efficient Blue Emissions

2019 ◽  
Author(s):  
Michael Worku ◽  
Yu Tian ◽  
Chenkun Zhou ◽  
Haoran Lin ◽  
Maya Chaaban ◽  
...  
Keyword(s):  
Precursor Solution ◽  
Visible Spectral Region ◽  
Metal Halide ◽  
Synthetic Control ◽  
Perovskite Nanocrystals ◽  
Highly Efficient ◽  
Quantum Confinement Effects ◽  
Metal Halide Perovskite ◽  
Lead Bromide ◽  
Halide Perovskite

Metal halide perovskite nanocrystals (NCs) have emerged as a new generation light emitting materials with narrow emissions and high photoluminescence quantum efficiencies (PLQEs). Various types of perovskite NCs, e.g. platelets, wires, and cubes, have been discovered to exhibit tunable emissions across the whole visible spectral region. Despite remarkable advances in the field of metal halide perovskite NCs over the last few years, many nanostructures in inorganic NCs have yet been realized in metal halide perovskites and producing highly efficient blue emitting perovskite NCs remains challenging and of great interest. Here we report for the first time the discovery of highly efficient blue emitting cesium lead bromide perovskite (CsPbBr3) NCs with hollow structures. By facile solution processing of cesium lead bromide perovskite precursor solution containing additional ethylenediammonium bromide and sodium bromide, in-situ formation of hollow CsPbBr3 NCs with controlled particle and pore sizes is realized. Synthetic control of hollow nanostructures with quantum confinement effects results in color tuning of CsPbBr3 NCs from green to blue with high PLQEs of up to 81 %.<br><div><br></div>

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