Luminescence and Nonradiative Processes in Porous Glasses

1991 ◽  
pp. 397-423 ◽  
Author(s):  
Renata Reisfeld
Keyword(s):  
Porous Glasses ◽  
Nonradiative Processes

scholarly journals Dynamic lattice distortions driven by surface trapping in semiconductor nanocrystals

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Burak Guzelturk ◽  
Benjamin L. Cotts ◽  
Dipti Jasrasaria ◽  
John P. Philbin ◽  
David A. Hanifi ◽  
...  
Keyword(s):  
Photon Energy ◽  
Semiconductor Nanocrystals ◽  
Atomic Scale ◽  
Atomistic Simulations ◽  
Shell System ◽  
Structural Distortions ◽  
Colloidal Semiconductor Nanocrystals ◽  
Femtosecond Electron Diffraction ◽  
Structural Deformations ◽  
Nonradiative Processes

AbstractNonradiative processes limit optoelectronic functionality of nanocrystals and curb their device performance. Nevertheless, the dynamic structural origins of nonradiative relaxations in such materials are not understood. Here, femtosecond electron diffraction measurements corroborated by atomistic simulations uncover transient lattice deformations accompanying radiationless electronic processes in colloidal semiconductor nanocrystals. Investigation of the excitation energy dependence in a core/shell system shows that hot carriers created by a photon energy considerably larger than the bandgap induce structural distortions at nanocrystal surfaces on few picosecond timescales associated with the localization of trapped holes. On the other hand, carriers created by a photon energy close to the bandgap of the core in the same system result in transient lattice heating that occurs on a much longer 200 picosecond timescale, dominated by an Auger heating mechanism. Elucidation of the structural deformations associated with the surface trapping of hot holes provides atomic-scale insights into the mechanisms deteriorating optoelectronic performance and a pathway towards minimizing these losses in nanocrystal devices.

The Kinetics of the Radiative and Nonradiative Processes in Nanocrystalline ZnO Particles upon Photoexcitation

2000 ◽  
Vol 104 (8) ◽  
pp. 1715-1723 ◽  
Author(s):  
Addy van Dijken ◽  
Eric A. Meulenkamp ◽  
Daniël Vanmaekelbergh ◽  
Andries Meijerink
Keyword(s):  
Zno Particles ◽  
Kinetics Of ◽  
Nonradiative Processes

Physical Properties of Organosilicate Porous Glasses

1993 ◽  
Vol 230 (1) ◽  
pp. 197-201
Author(s):  
E. Rysiakiewicz-easek ◽  
Ya. O. Roizin ◽  
K. Marczuk ◽  
A. Alexeev-popov
Keyword(s):  
Physical Properties ◽  
Porous Glasses

Temperature dependences of the order parameter for sodium nitrite embedded into porous glasses and opals

2010 ◽  
Vol 52 (5) ◽  
pp. 1092-1097 ◽  
Author(s):  
A. I. Beskrovny ◽  
S. G. Vasilovskiĭ ◽  
S. B. Vakhrushev ◽  
D. A. Kurdyukov ◽  
O. I. Zvorykina ◽  
...  
Keyword(s):  
Sodium Nitrite ◽  
Order Parameter ◽  
Porous Glasses ◽  
Temperature Dependences

Intramolecular donor-acceptor systems. Radiative and nonradiative processes for the excited states of 2-N-arylamino-6-naphthalenesulfonates

1975 ◽  
Vol 97 (8) ◽  
pp. 2167-2178 ◽  
Author(s):  
Edward M. Kosower ◽  
Hanna Dodiuk ◽  
Kazutake Tanizawa ◽  
Michael Ottolenghi ◽  
Naomi Orbach
Keyword(s):  
Excited States ◽  
Donor Acceptor ◽  
Nonradiative Processes

Fractal Behaviour of Porous Glasses

1989 ◽  
pp. 379-392
Author(s):  
Renata Reisfeld
Keyword(s):  
Porous Glasses ◽  
Fractal Behaviour

Small Angle Neutron Scatitering Study of Sol-Gel Glasses

1989 ◽  
Vol 166 ◽  
Author(s):  
P. Wiltzius ◽  
S. B. Dierker
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Structure Factor ◽  
Small Angle Neutron Scattering ◽  
Sol Gel ◽  
Scattering Data ◽  
Length Scales ◽  
Internal Interface ◽  
Porous Glasses ◽  
Gel Glasses

ABSTRACTWe present small angle neutron scattering data of porous glasses. Analysis of the structure factor shows that the morphology on length scales between 30 A and 800 A depends on fabrication procedures. Fast gelation leads to a clumpy glass, whereas slow gelation produces a random smooth internal interface.

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