Luminescence Properties of Ytterbium and Oxygen Coimplanted InP

1995 ◽  
Vol 417 ◽  
Author(s):  
H. J. Lozykowski ◽  
A. K. Alshawa
Keyword(s):  
Energy Transfer ◽  
Annealing Temperature ◽  
Energy Transfer Process ◽  
Deep Trap ◽  
The Core ◽  
Sufficient Energy ◽  
Intrinsic Excitation ◽  
Direct Energy ◽  
Deep Donor ◽  
Effect Of Oxygen

AbstractIn this work we report a systematic study of the effect of oxygen on ytterbium 4f- 4f emission by coimplanting Yb and O into InP. The PL spectra of InP: Yb and InP: (Yb+O) as a function of annealing temperature and duration were studied. In addition the photoluminescence and kinetic processes were investigated as a function of temperature and excitation intensity.The investigation shows that the codoped oxygen reduces drastically the Yb3+ emissioon from SI and n-type InP:Yb under intrinsic excitation. The codoping of Yb and 0 may create a complex involving a YbIn and Op. This structured isoelectronic (YbIn- Op) complex, may behave as a deep trap (or a deep donor) located approximately at the middle of bandgap. Exciton bound to such centers will not have sufficient energy to excite the core Yb 4f electrons by Auger direct energy transfer process.

Direct energy transfer from the peripheral LH2 antenna to the reaction center in a mutant of Rhodobacter sphaeroides that lacks the core LH1 antenna

Biochemistry ◽  
1993 ◽  
Vol 32 (39) ◽  
pp. 10314-10322 ◽  
Author(s):  
S. Hess ◽  
K. Visscher ◽  
J. Ulander ◽  
T. Pullerits ◽  
M. R. Jones ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Reaction Center ◽  
Rhodobacter Sphaeroides ◽  
The Core ◽  
Direct Energy ◽  
Direct Energy Transfer

scholarly journals Experimental Study of Optical Properties of Polymeric Nanowires

2020 ◽  
Author(s):  
Mohamed Mbarek ◽  
Abeer Altowyan ◽  
Nawal Almaymoni
Keyword(s):  
Experimental Study ◽  
Optical Properties ◽  
Energy Transfer ◽  
Diffusion Length ◽  
Energy Transfer Process ◽  
Life Time ◽  
Average Life ◽  
The Core ◽  
Förster Energy Transfer ◽  
Experimental Decay

Abstract Photo-emissive properties including steady-state and transient photoluminescence (PL) spectroscopy are studied for blinding and coaxial nanowires based PPV and PVK. PL data or average life time of excitons depending exclusively of the nanostructures architecture. Furthermore, the interpretation of PL spectra requires invoking the migration and the diffusion length of photo-generated exciton from luminophores to other luminophores or from the core to the shell. This process is able to explain the experimental decay of PL in the nano-second time scale. The evidence of Forster energy transfer (FET) and charge transfer (CT) has been investigated in the synthesis nanostructures. An enhancement and amplification PPV luminophore emission by the presence of PVK luminophore in blinding or coaxial nanowires due to energy transfer process.

Heat, quantum mechanics and information

2015 ◽  
Vol 10 (2) ◽  
pp. 2692-2695
Author(s):  
Bhekuzulu Khumalo
Keyword(s):  
Information Theory ◽  
Quantum Mechanics ◽  
Energy Transfer ◽  
Transfer Process ◽  
Energy Transfer Process ◽  
Process Information ◽  
Double Slit Experiment ◽  
Slit Experiment ◽  
Double Slit

Heat has often been described as part of the energy transfer process. Information theory says everything is information. If everything is information then what type of information is heat, this question can be settled by the double slit experiment, but we must know what we are looking for. 

Ecotypic variation affects the conservation of North American badgers endangered along their northern range extent

2018 ◽  
Author(s):  
Richard D. Weir ◽  
Trevor A. Kinley ◽  
Richard W. Klafki ◽  
Clayton D. Apps
Keyword(s):  
British Columbia ◽  
Cause Of Death ◽  
Conservation Strategies ◽  
High Fecundity ◽  
Ecological Information ◽  
The Core ◽  
Ecotypic Variation ◽  
Sufficient Energy ◽  
Soil Deposits ◽  
Regional Conservation

This chapter is based on ecological information on 82 radio-tagged badgers (39 F, 43 M) among three study populations in British Columbia, Canada between 1996 and 2010, data that were collected to learn more about the ecology of badgers and consider how variation in their ecology might inform regional conservation strategies. The widely spaced, lower density prey and distribution of soil deposits suitable for digging in British Columbia likely required badgers to use substantially larger areas, relative to the core range, in which to acquire sufficient energy to survive and reproduce. Strikes from automobiles were the primary cause of death among all radio-tagged badgers and this source of mortality is pervasive throughout the limited distribution of badgers in British Columbia. Despite their potential for high fecundity, populations of badgers in British Columbia likely remain at considerable risk compared to those in the core of the species’ range.

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