scholarly journals Time-Resolved Photoluminescence Microscopy for the Analysis of Semiconductor-Based Paint Layers

Materials ◽  
2017 ◽  
Vol 10 (11) ◽  
pp. 1335 ◽  
Author(s):  
Daniela Comelli ◽  
Alessia Artesani ◽  
Austin Nevin ◽  
Sara Mosca ◽  
Victor Gonzalez ◽  
...  
Keyword(s):  
Time Resolved ◽  
Photoluminescence Microscopy ◽  
Time Resolved Photoluminescence

Time‐resolved photoluminescence microscopy of GaInAs/GaInAsP quantum wells intermixed using a pulsed laser technique

1996 ◽  
Vol 79 (12) ◽  
pp. 9390-9392 ◽  
Author(s):  
S. J. Fancey ◽  
G. S. Buller ◽  
J. S. Massa ◽  
A. C. Walker ◽  
C. J. McLean ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Pulsed Laser ◽  
Laser Technique ◽  
Time Resolved ◽  
Photoluminescence Microscopy ◽  
Time Resolved Photoluminescence

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

2017 ◽  
Vol 111 (23) ◽  
pp. 233902 ◽  
Author(s):  
Darius Kuciauskas ◽  
Dingyuan Lu ◽  
Sachit Grover ◽  
Gang Xiong ◽  
Markus Gloeckler
Keyword(s):  
Grain Boundary ◽  
Time Resolved ◽  
Photoluminescence Microscopy ◽  
Time Resolved Photoluminescence

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

2018 ◽  
Vol 90 (18) ◽  
pp. 10771-10779 ◽  
Author(s):  
Marta Ghirardello ◽  
Sara Mosca ◽  
Javier Marti-Rujas ◽  
Luca Nardo ◽  
Aviva Burnstock ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Time Resolved ◽  
X Ray ◽  
Photoluminescence Microscopy ◽  
Time Resolved Photoluminescence

Exciton dynamics in thick GaN MOVPE epilayers deposited on sapphire.

1997 ◽  
Vol 2 ◽  
Author(s):  
J. Allègre ◽  
P. Lefebvre ◽  
J. Camassel ◽  
B. Beaumont ◽  
Pierre Gibart
Keyword(s):  
Layer Thickness ◽  
Buffer Layers ◽  
Rate Equations ◽  
Time Resolved ◽  
Versus Layer ◽  
Level Model ◽  
Shallow Impurities ◽  
Aln Buffer ◽  
Time Resolved Photoluminescence

Time-resolved photoluminescence spectra have been recorded on three GaN epitaxial layers of thickness 2.5 μm, 7 μm and 16 μm, at various temperatures ranging from 8K to 300K. The layers were deposited by MOVPE on (0001) sapphire substrates with standard AlN buffer layers. To achieve good homogeneities, the growth was in-situ monitored by laser reflectometry. All GaN layers showed sharp excitonic peaks in cw PL and three excitonic contributions were seen by reflectivity. The recombination dynamics of excitons depends strongly upon the layer thickness. For the thinnest layer, exponential decays with τ ~ 35 ps have been measured for both XA and XB free excitons. For the thickest layer, the decay becomes biexponential with τ1 ~ 80 ps and τ2 ~ 250 ps. These values are preserved up to room temperature. By solving coupled rate equations in a four-level model, this evolution is interpreted in terms of the reduction of density of both shallow impurities and deep traps, versus layer thickness, roughly following a L−1 law.

ZnCdO/ZnMgO and ZnO/AlGaN Heterostructures for UV and Visible Light Emitters

2005 ◽  
Vol 892 ◽  
Author(s):  
Andrei Osinsky ◽  
Jianwei Dong ◽  
J. Q. Xie ◽  
B. Hertog ◽  
A. M. Dabiran ◽  
...  
Keyword(s):  
Molecular Beam ◽  
Compositional Analysis ◽  
Optical Emission ◽  
Rf Plasma ◽  
Light Emitters ◽  
Time Resolved ◽  
Light Emitting ◽  
Spatially Resolved ◽  
Time Resolved Photoluminescence ◽  
Made In

AbstractThis paper reviews of some of the progress made in the development of ZnO-based light emitting diodes (LEDs). n-ZnO/p-AlGaN-based heterostructures have been successfully for the fabrication of UV emitting LEDs that have operated at temperatures up to 650K, suggesting an excitonic origin for the optical transitions. RF-plasma-assisted molecular beam epitaxy has been used to grow epitaxial CdxZn1-xO films on GaN/sapphire structure. These films have a single-crystal wurtzite structure as demonstrated by structural and compositional analysis. High quality CdxZn1-xO films were grown with up to x=0.78 mole fraction as determined by RBS and SIMS techniques. Optical emission ranging from purple (Cd0.05Zn0.95O) to yellow (Cd0.29Zn0.71O) was observed. Compositional fluctuations in a Cd0.16Zn0.84O films were not detected by spatially resolved CL measurements, although intensity fluctuation with features of ∼0.5 μm diameter were seen on the intensity maps. Time resolved photoluminescence shows multi-exponential decay with 21 psec. and 49±3 psec. lifetimes, suggesting that composition micro-fluctuations may be present in Cd0.16Zn0.84O film.

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