Role of Trap States in Excitation Wavelength-Dependent Photoluminescence of Strongly Quantum-Confined All-Inorganic CsPbBr3 Perovskites with Varying Dimensionalities

2021 ◽  
Author(s):  
Mengling Liao ◽  
Beibei Shan ◽  
Ming Li
Keyword(s):  
Excitation Wavelength ◽  
Trap States ◽  
Quantum Confined

scholarly journals Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 780
Author(s):  
Elke Beyreuther ◽  
Julius Ratzenberger ◽  
Matthias Roeper ◽  
Benjamin Kirbus ◽  
Michael Rüsing ◽  
...  
Keyword(s):  
Electrical Measurement ◽  
Excitation Wavelength ◽  
Trap States ◽  
Strontium Barium Niobate ◽  
Strontium Barium ◽  
Current Voltage ◽  
History Of ◽  
A Current ◽  
Complex Manner

In the last two decades, variably doped strontium barium niobate (SBN) has attracted a lot of scientific interest mainly due to its specific non-linear optical response. Comparably, the parental compound, i.e., undoped SBN, appears to be less studied so far. Here, two different cuts of single-crystalline nominally pure strontium barium niobate in the composition Sr0.61Ba0.39Nb2O6 (SBN61) are comprehensively studied and analyzed with regard to their photoconductive responses. We present conductance measurements under systematically varied illumination conditions along either the polar z-axis or perpendicular to it (x-cut). Apart from a pronounced photoconductance (PC) already under daylight and a large effect upon super-bandgap illumination in general, we observe (i) distinct spectral features when sweeping the excitation wavelength over the sub-bandgap region as then discussed in the context of deep and shallow trap states, (ii) extremely slow long-term relaxation for both light-on and light-off transients in the range of hours and days, (iii) a critical dependence of the photoresponse on the pre-illumination history of the sample, and (iv) a current–voltage hysteresis depending on both the illumination and the electrical-measurement conditions in a complex manner.

Insight role of TiO2 to improve the photocatalytic performance of WO3 nanostructures for the efficient degradation of ciprofloxacin

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Muhammad Bilal Tahir ◽  
Sohail Farman ◽  
Adil Rasheed ◽  
Hussein Alrobei ◽  
Khurram Shahzad ◽  
...  
Keyword(s):  
Tungsten Trioxide ◽  
Research Work ◽  
Morphological Structure ◽  
Composite Catalyst ◽  
Excitation Wavelength ◽  
Spherical Structure ◽  
Vis Spectroscopy ◽  
Average Size ◽  
Wo3 Nanostructures

Abstract The current research work is to investigate the photocatalytic efficiency and degradation of ciprofloxacin using WO3/TiO2 nanoparticles under visible light irradiation. The nanoparticles of tungsten trioxide (WO3) and its composite with titanium dioxide (TiO2) i.e. WO3/TiO2 was prepared by hydrothermal method. Four basic characterizations were performed to study the prepared sample materials. To study the morphology of the prepared samples, scanning electron microscopy (SEM) was used. The results of SEM clearly showed that tungsten trioxide (WO3) has Rectangular shaped structure. The average size of the pure Tungsten trioxide nanoparticles was about 40–540 nm. The composite of WO3/TiO2 has spherical structure. The reason behind that was the addition of TiO2 in WO3 changes the morphology of pure WO3, and transformed the rectangular structure to a spherical structure. The presence of TiO2 changes the position and orientation of the nanorods in all possible directions. For the detailed analysis of the functional groups present in these samples, band gap, and optical properties of these samples, Fourier transform infrared spectroscopy (FTIR), ultraviolet visible (UV–VIS) spectroscopy and Photoluminescence (PL) emission spectroscopy was used. UV–Vis spectroscopy results showed that the bandgaps of prepared catalysts vary within the range of 2.76 – 2.5 eV. This decrease in bandgap is directly related with the concentration ratio of TiO2 in WO3. The maximum excitation wavelength observed at 440 nm. The maximum degradation efficiency was at 2% of WO3/TiO2 composite catalyst due to unique morphological structure and increase rate of photo absorption.

Revealing the origin of excimer emission in anthracene crystals: The role of excitation wavelength and pressure

2019 ◽  
Vol 376 ◽  
pp. 263-268 ◽  
Author(s):  
Cheng Tang ◽  
Xiaojun Zhu ◽  
Yunfei Song ◽  
Weilong Liu ◽  
Qingxin Yang ◽  
...  
Keyword(s):  
Excitation Wavelength ◽  
Excimer Emission

Role of trap states in forward scattering of resonance light

1997 ◽  
Vol T70 ◽  
pp. 138-144 ◽  
Author(s):  
Bogdan Lobodzinski ◽  
Wojciech Gawlik
Keyword(s):  
Forward Scattering ◽  
Trap States

scholarly journals The nature and role of trap states in a dendrimer-based organic field-effect transistor explosive sensor

2013 ◽  
Vol 102 (24) ◽  
pp. 243301 ◽  
Author(s):  
Guoqiang Tang ◽  
Simon S. Y. Chen ◽  
Kwan H. Lee ◽  
Almantas Pivrikas ◽  
Muhsen Aljada ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistor ◽  
Trap States ◽  
Organic Field Effect Transistor ◽  
Effect Transistor ◽  
Explosive Sensor

scholarly journals Dual Role of Electron-Accepting Metal-Carboxylate Ligands: Reversible Expansion of Exciton Delocalization and Passivation of Nonradiative Trap-States in Molecule-like CdSe Nanocrystals

2016 ◽  
Vol 138 (39) ◽  
pp. 12813-12825 ◽  
Author(s):  
Katie N. Lawrence ◽  
Poulami Dutta ◽  
Mulpuri Nagaraju ◽  
Meghan B. Teunis ◽  
Barry B. Muhoberac ◽  
...  
Keyword(s):  
Dual Role ◽  
Cdse Nanocrystals ◽  
Metal Carboxylate ◽  
Trap States ◽  
Carboxylate Ligands
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