Relating transient electroluminescence lifetime and bulk transit time in OLED during switch-off

2021 ◽  
Author(s):  
Shiran Nabha-Barnea ◽  
Dor Gotleyb ◽  
Adi Yonish ◽  
Rafi Shikler
Keyword(s):  
Space Charge ◽  
Transit Time ◽  
Radiative Recombination ◽  
Transient Electroluminescence

The EL decay is attributed to the transit time, and it originates from the radiative recombination of newly formed singlet excitons during the discharge of the space-charge regions.

scholarly journals Analytical Models of Bulk and Quantum Well Solar Cells and Relevance of the Radiative Limit

2012 ◽  
pp. 59-77 ◽  
Author(s):  
James P. Connolly
Keyword(s):  
Solar Cells ◽  
Quantum Well ◽  
Space Charge ◽  
Radiative Recombination ◽  
Light Trapping ◽  
Open Circuit ◽  
Analytical Models ◽  
Injection Currents ◽  
Photon Recycling ◽  
Open Circuit Voltages

The analytical modelling of bulk and quantum well solar cells is reviewed. The analytical approach allows explicit estimates of dominant generation and recombination mechanisms at work in charge neutral and space charge layers of the cells. Consistency of the analysis of cell characteristics in the light and in the dark leaves a single free parameter, which is the mean Shockley-Read-Hall lifetime. Bulk PIN cells are shown to be inherently dominated by non-radiative recombination as a result of the doping related non-radiative fraction of the Shockley injection currents. Quantum well PIN solar cells on the other hand are shown to operate in the radiative limit as a result of the dominance of radiative recombination in the space charge region. These features are exploited using light trapping techniques leading to photon recycling and reduced radiative recombination. The conclusion is that the mirror backed quantum well solar cell device features open circuit voltages determined mainly by the higher bandgap neutral layers, with an absorption threshold determined by the lower gap quantum well superlattice.

THE TOWNSEND DISCHARGE IN A COAXIAL DIODE WITH AXIAL MAGNETIC FIELD

1958 ◽  
Vol 36 (3) ◽  
pp. 255-270 ◽  
Author(s):  
P. A. Redhead
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Space Charge ◽  
Transit Time ◽  
Pressure Range ◽  
Axial Magnetic Field ◽  
Constant Electric Field ◽  
Approximate Theory ◽  
Charge Effects ◽  
Townsend Discharge

An approximate theory is developed of the breakdown characteristics of a coaxial diode in an axial magnetic field, taking into account the effects of elastic collisions. It is assumed that the electron moves in a constant electric field between collisions and thus the theory is valid only in the appropriate range of magnetic field and voltage. Estimates of transit time and of space-charge effects are also made. Measurements in the pressure range 10−3 to 10−9 mm. Hg are in general agreement with the theory.

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