Time-Resolved Photoluminescence Microscopy Combined with X-ray Analyses and Raman Spectroscopy Sheds Light on the Imperfect Synthesis of Historical Cadmium Pigments

ABSTRACTWe propose and demonstrate the photoluminescence enhancement of CsPbBr3 perovskite quantum dot films in the presence of Au nanoparticles. Embedded into a polymer matrix, Au nanoparticle- quantum dot film assemble prepared by an easy spin coating method enabled the photoluminescence enhancement of perovskite quantum dot films up to 78%. The properties of the synthesized perovskite QDs and gold nanoparticles have been analysed using high resolution transmission electron microscopy, X-ray diffraction, energy dispersive X- ray spectroscopy, UV-Vis absorption spectrophotometer, steady state and time-resolved photoluminescence spectrometer.

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Separating grain-boundary and bulk recombination with time-resolved photoluminescence microscopy

Applied Physics Letters ◽

10.1063/1.5010931 ◽

2017 ◽

Vol 111 (23) ◽

pp. 233902 ◽

Cited By ~ 9

Author(s):

Darius Kuciauskas ◽

Dingyuan Lu ◽

Sachit Grover ◽

Gang Xiong ◽

Markus Gloeckler

Keyword(s):

Grain Boundary ◽

Time Resolved ◽

Photoluminescence Microscopy ◽

Time Resolved Photoluminescence

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X-ray studies and time-resolved photoluminescence on optically pumped antimonide-based midinfrared type-II lasers

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy ◽

10.1016/j.saa.2003.11.040 ◽

2004 ◽

Vol 60 (14) ◽

pp. 3387-3392 ◽

Cited By ~ 1

Author(s):

Carsten Schwender ◽

Jan Oliver Drumm ◽

Goetz Hoffmann ◽

Birgit Vogelgesang ◽

Henning Fouckhardt

Keyword(s):

Type Ii ◽

Optically Pumped ◽

Time Resolved ◽

X Ray ◽

Time Resolved Photoluminescence

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Tuning the Photo-Luminescence Properties of WO3 Layers by the Adjustment of Layer Formation Conditions

Materials ◽

10.3390/ma13122814 ◽

2020 ◽

Vol 13 (12) ◽

pp. 2814 ◽

Cited By ~ 2

Author(s):

Milda Petruleviciene ◽

Jurga Juodkazyte ◽

Maliha Parvin ◽

Alla Tereshchenko ◽

Simonas Ramanavicius ◽

...

Keyword(s):

Sol Gel ◽

Photo Luminescence ◽

X Ray Diffraction ◽

Time Resolved ◽

X Ray ◽

Photoluminescence Decay ◽

Formation Conditions ◽

Sol Gel Synthesis ◽

Time Resolved Photoluminescence ◽

Dipping Time

In this research we have applied sol-gel synthesis for the deposition of tungsten (VI) oxide (WO3) layers using two different reductants (ethanol and propanol) and applying different dipping times. WO3 samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier Transform Infrared spectroscopy (FTIR), photoluminescence (PL) and time-resolved photoluminescence decay methods. Photoelectrochemical (PEC) behaviour of synthesized coatings was investigated using cyclic voltammetry in the dark and under illumination. Formation of different structures in differently prepared samples was revealed and significant differences in the PL spectra and PEC performance of the samples were observed. The results showed that reductant used in the synthesis and dipping time strongly influenced photo-electrochemical properties of the coatings. Correlation between the morphology, PL and PEC behaviour has been explained.

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Exploring the Potential of Time-Resolved Photoluminescence Spectroscopy for the Detection of Plastics

Applied Spectroscopy ◽

10.1177/0003702820933282 ◽

2020 ◽

Vol 74 (9) ◽

pp. 1161-1166

Author(s):

Sebastian Gies ◽

Eva-Marie Schömann ◽

Julia Anna Prume ◽

Martin Koch

Keyword(s):

Raman Spectroscopy ◽

Ir Spectroscopy ◽

Terrestrial Ecosystems ◽

Photoluminescence Spectroscopy ◽

Time Resolved ◽

Plastic Materials ◽

Photoluminescence Lifetime ◽

Ft Ir ◽

Time Resolved Photoluminescence ◽

Ft Ir Spectroscopy

Accurate data on microplastic occurrence in aquatic and terrestrial ecosystems are a basic requirement for microplastic risk assessment and management. Existing analysis techniques like Raman spectroscopy and Fourier transform infrared (FT-IR) spectroscopy imaging are still time-consuming and depend on laborious sample preparation. Therefore, we investigate the potential of time-resolved photoluminescence spectroscopy as an alternative technique to identify plastic materials, and, for the first time determine the photoluminescence lifetime of a series of polymers and several non-plastic samples typically found in a marine environment. The obtained photoluminescence lifetimes can be used to distinguish between plastic and natural materials. Furthermore, they allow us to identify distinct types of plastics. Therefore, the described approach has the potential to identify materials either as a stand-alone technique or for pre-characterization of sample materials for otherwise time-consuming analytical methods such as Raman spectroscopy or FT-IR spectroscopy.

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Emission Mechanism of the InGaN MQW Grown by MOCVD

MRS Proceedings ◽

10.1557/proc-449-665 ◽

1996 ◽

Vol 449 ◽

Author(s):

Yukio Narukawa ◽

Yoichi Kawakami ◽

Shizuo Fujita ◽

Shigeo Fujita ◽

Shuji Nakamura

Keyword(s):

Dynamical Behavior ◽

Multiple Quantum Well ◽

Multiple Quantum ◽

Rich Region ◽

Time Resolved ◽

Tail State ◽

X Ray ◽

Transmission Electron ◽

Valence Bands ◽

Time Resolved Photoluminescence

ABSTRACTDynamical behavior of radiative recombination has been assessed in the In0.20Ga0.80N (3nm)/In0.05Ga0.95N (6 nm) multiple quantum well (MQW) structure by means of transmittance (TR), electroreflectance (ER), photoluminescence excitation (PLE) and time-resolved photoluminescence (TRPL) spectroscopy. The PL at 20 K was mainly composed of two emission bands whose peaks are located at 2.920 eV and 3.155 eV. The ER and PLE revealed that the transition at 3.155 eV is due to the excitons at quantized level between n=1 conduction and n=1 A(Γ9υ) valence bands, while the main PL peak at 2.920 eV is attributed to the excitons localized at the trap centers within the well. The TRPL features were well understood as the effect of localization where photo-generated excitons are transferred from the n=1 band to the localized centers, and then are localized further to the tail state. The origin of the localized centers were attributed to the In-rich region in the wells acting as quantum dots which could be observed by transmission electron microscopy (TEM) and energy-dispersive X-ray microanalysis (EDX).

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