Numerical study of the influence of applied voltage on the current balance factor of single layer organic light-emitting diodes

Current balance factor (CBF) value, the ratio of the recombination current density and the total current density of a device, has an important function in fluorescence-based organic light-emitting diodes (OLEDs), as well as in the performance of the organic electrophosphorescent devices. This paper...

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Bibliographic Details
Published in:Journal of applied physics 2014-04, Vol.115 (16)
Main Authors: Lu, Fei-ping, Liu, Xiao-bin, Xing, Yong-zhong
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CURRENT DENSITY
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRON BEAM INJECTION
ELECTRON MOBILITY
FLUORESCENCE
HOLE MOBILITY
HOLES
LAYERS
LIGHT EMITTING DIODES
Mathematical models
NUMERICAL ANALYSIS
Organic light emitting diodes
RECOMBINATION
TRAPS
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Summary:Current balance factor (CBF) value, the ratio of the recombination current density and the total current density of a device, has an important function in fluorescence-based organic light-emitting diodes (OLEDs), as well as in the performance of the organic electrophosphorescent devices. This paper investigates the influence of the applied voltage of a device on the CBF value of single layer OLED based on the numerical model of a bipolar single layer OLED with organic layer trap free and without doping. Results show that the largest CBF value can be achieved when the electron injection barrier (ϕn) is equal to the hole injection barrier (ϕp) in the lower voltage region at any instance. The largest CBF in the higher voltage region can be achieved in the case of ϕn > ϕp under the condition of electron mobility (μ0n) > hole mobility (μ0p), whereas the result for the case of μ0n 
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4873456