Revealing the Role of Interfaces in Photocarrier Dynamics of Perovskite Films by Alternating Front/Back Side Excitation Time-Resolved Photoluminescence

2020 ◽  
Vol 124 (11) ◽  
pp. 6290-6296 ◽  
Author(s):  
Peng Zeng ◽  
Guanqun Feng ◽  
Xiang Cui ◽  
Mingzhen Liu
Keyword(s):  
Back Side ◽  
Time Resolved ◽  
Excitation Time ◽  
Time Resolved Photoluminescence

Origin of strong red emission in Er3+-based upconversion materials: role of intermediate states and cross relaxation

2019 ◽  
Vol 21 (43) ◽  
pp. 24026-24033 ◽  
Author(s):  
Chiho Lee ◽  
Heeyeon Park ◽  
Woong Kim ◽  
Sungnam Park
Keyword(s):  
Upconversion Luminescence ◽  
Photoluminescence Spectroscopy ◽  
Cross Relaxation ◽  
Time Resolved ◽  
Red Emission ◽  
Intermediate States ◽  
Time Resolved Photoluminescence

Comprehensive NIR-to-visible upconversion luminescence mechanism in Er3+-based materials is elucidated by wavelength-dependent, power-dependent, and time-resolved photoluminescence spectroscopy.

Role of Tryptophan in Protein–Nanocrystals Interaction: Energy or Charge Transfer

2018 ◽  
Vol 233 (1) ◽  
pp. 41-54 ◽  
Author(s):  
Mona Mittal ◽  
Saurabh Gautam ◽  
Pramit Kumar Chowdhury ◽  
Shashank Deep ◽  
Sameer Sapra
Keyword(s):  
Charge Transfer ◽  
Steady State ◽  
Semiconductor Nanocrystals ◽  
Binding Model ◽  
Time Resolved ◽  
Tryptophan Residues ◽  
Mechanism Of Interaction ◽  
Pl Intensity ◽  
Time Resolved Photoluminescence

Abstract The understanding of the interaction between the semiconductor nanocrystals (NCs) and the proteins are essential for design and fabrication of nanocomposites for application in the field of biotechnology. Herein, we have studied the interaction between CdTe NCs and the proteins by steady-state and time-resolved photoluminescence (PL) spectroscopy. The steady-state PL intensity of CdTe NCs is quenched and enhanced in the presence of lysozyme and bovine serum albumin, respectively. However, the PL intensity of CdTe NCs is not affected with α-synuclein, indicating the role of tryptophan moiety in the protein–NCs interaction. The detailed analysis of PL data allows us to elucidate the dominant mechanism of interaction, i.e. charge or energy transfer, depending on the location of tryptophan residues in the protein. Assuming a Poisson statistic of lysozymes around NCs, the Poisson binding model is used to understand the kinetics of charge transfer from CdTe NCs to the lysozyme. It provides the average number of lysozymes present on the surface of one CdTe NC.

scholarly journals Inter-phase charge and energy transfer in Ruddlesden–Popper 2D perovskites: critical role of the spacing cations

2018 ◽  
Vol 6 (15) ◽  
pp. 6244-6250 ◽  
Author(s):  
Kaibo Zheng ◽  
Yani Chen ◽  
Yong Sun ◽  
Junsheng Chen ◽  
Pavel Chábera ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Charge Carrier ◽  
Transient Absorption ◽  
Critical Role ◽  
Carrier Dynamics ◽  
Time Resolved ◽  
Charge Carrier Dynamics ◽  
Time Resolved Photoluminescence

Photo-generated charge carrier dynamics in Ruddlesden–Popper 2D perovskites with linear (n-BA) and branched (iso-BA) butylamine as spacing cations have been studied by using transient absorption and time-resolved photoluminescence spectroscopies.

Time-resolved photoluminescence of heavily nitrogen-doped ZnSe: role of fluctuations

1998 ◽  
Vol 184-185 ◽  
pp. 525-530 ◽  
Author(s):  
I. Kuskovsky ◽  
D. Li ◽  
G.F. Neumark ◽  
M. Moldovan ◽  
N.C. Giles ◽  
...  
Keyword(s):  
Time Resolved ◽  
Nitrogen Doped ◽  
Time Resolved Photoluminescence

Comparative photophysical study of Pt(II) complex-nanoclay hybrid materials as dry powders and hydrogels

2020 ◽  
Vol 75 (11) ◽  
pp. 991-996
Author(s):  
Sathish Chatnahalli Gangadharappa ◽  
Cristian A. Strassert
Keyword(s):  
Excited State ◽  
Coordination Compounds ◽  
Molecular Level ◽  
Structural Features ◽  
Time Resolved ◽  
Dry Powders ◽  
Water Dispersibility ◽  
Photophysical Study ◽  
Time Resolved Photoluminescence

AbstractThe excited state properties of Pt(II) complexes are strongly influenced by their microenvironment and by intermolecular interactions. In this work, we investigated the photoluminescence of six Pt(II) complexes adsorbed onto a layered nanoclay, namely Laponite® (LAP). The excellent water dispersibility and gel-forming nature of the LAP was exploited to achieve a class of versatile materials. In particular, we report on the comparative photophysics of the dry powders and the hydrogels. Steady-state and time-resolved photoluminescence spectroscopy were used to assess the role of structural features at molecular level on the interaction between the nanodiscs, which in turn affects the intermolecular coupling of the coordination compounds in the excited state.

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