Numerical simulation of multilayer organic light-emitting diodes with host–guest emissive layer: the role of defect states

Nasab, Pezhman Sheykholeslami; Darareh, Mahdi Davoudi; Yousefi, Mohammad; Rostamnejadi, Ali

doi:10.1007/s11082-020-02387-5

Cited by 2 publications

(13 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The conventional framework used to obtain current density consists of drift-diffusion equations coupled with Poisson's equation, [12,18] in which the drift-diffusion equations are continuity equations of charge carriers, and Poisson's equation relates the electrostatic potential to the density of the charge carrier: [19]…”

Section: Theoretical Models 21 Charge Carrier Transport Modelmentioning

confidence: 99%

“…Charge carrier mobility in the emissive layer is described separately in Subsection 2.3. While, for the organic charge-transporting layers, we use the field-dependent Poole-Frenkel mobility model [12] µ…”

Section: Theoretical Models 21 Charge Carrier Transport Modelmentioning

confidence: 99%

“…where µ 0 and E 0 are the zero-field mobility and characteristic electric field of the materials, respectively; T is the device temperature; and E is the electric field. Due to the different work function of the electrodes and possibly the dipole layers at the electrode/organic interfaces, the relation between the applied voltage and the electric field should be written in the effective form [12] l 0…”

Section: Theoretical Models 21 Charge Carrier Transport Modelmentioning

confidence: 99%

“…where D p and D n are the diffusion coefficients of holes and electrons which, by assuming the Einstein relation, can be expressed as D p = µ p kT /q and D n = µ n kT /q, respectively; [12] k is the Boltzmann's constant; and the energy levels of the HOMO and LUMO are represented respectively by E HOMO and E LUMO , which can be written as [12] E HOMO = − qψ…”

Section: Theoretical Models 21 Charge Carrier Transport Modelmentioning

confidence: 99%

“…[9][10][11] Despite considerable experimental studies on hybrid QD-LEDs, few theoretical modeling and numerical simulations have been performed. In previous work, [12] we introduced a model for simulating organic light-emitting diodes (OLED) with organic dopant in the emissive layer, in which the carrier mobility was described using the Poole-Frenkel model. This field-dependent mobility model is commonly used to calculate the mobility of the organic layers doped with organic emitters, in which the doping percent is generally lower than 1%.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Modeling and numerical simulation of electrical and optical characteristics of a quantum dot light-emitting diode based on the hopping mobility model: Influence of quantum dot concentration

Sheykholeslami-Nasab¹,

Davoudi-Darareh²,

Yousefi³

2022

Chinese Phys. B

View full text Add to dashboard Cite

We present a comprehensive numerical framework for the electrical and optical modeling and simulation of hybrid quantum dot light-emitting diodes (QD-LEDs). We propose a model known as hopping mobility to calculate the carrier mobility in the emissive organic layer doped with quantum dots (QDs). To evaluate the ability of this model to describe the electrical characteristics of QD-LEDs, the measured data of a fabricated QD-LED with different concentrations of QDs in the emissive layer were taken, and the corresponding calculations were performed based on the proposed model. The simulation results indicate that the hopping mobility model can describe the concentration dependence of the electrical behavior of the device. Then, based on the continuity equation for singlet and triplet excitons, the exciton density profiles of the devices with different QD concentrations were extracted. Subsequently, the corresponding luminance characteristics of the devices were calculated, where the results are in good agreement with the experimental data.

show abstract

Section: Theoretical Models 21 Charge Carrier Transport Modelmentioning

confidence: 99%

Section: Theoretical Models 21 Charge Carrier Transport Modelmentioning

confidence: 99%

Section: Theoretical Models 21 Charge Carrier Transport Modelmentioning

confidence: 99%

Section: Theoretical Models 21 Charge Carrier Transport Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modeling and numerical simulation of electrical and optical characteristics of a quantum dot light-emitting diode based on the hopping mobility model: Influence of quantum dot concentration

Sheykholeslami-Nasab¹,

Davoudi-Darareh²,

Yousefi³

2022

Chinese Phys. B

View full text Add to dashboard Cite

show abstract

Numerical study of hybrid quantum dot light-emitting diode with different concentration of quantum dots in the emissive layer

Sheykholeslami-Nasab

Davoudi-Darareh

Yousefi

2021

Eur. Phys. J. Appl. Phys.

View full text Add to dashboard Cite

In this study, a model for numerical simulation of carrier transport mechanism in the hybrid quantum dot light-emitting diodes (QD-LEDs) is presented. The carrier mobility in the polymer layer doped with quantum dots (QDs) was calculated by a proposed hopping mobility, which is a concentration-dependent mobility model based on the Gaussian distribution of density-of-states and the effective transport energy models. A QD-LED structure based on PVK:CdSe-QDs blend as the emissive layer with different QD concentrations were fabricated and their current density versus voltage (J-V) characteristic were measured. The numerical results were compared with experimental data, which indicates the ability of the proposed mobility model to describe the general trend of the electrical characteristics of the devices. Then, the exciton density profiles of the devices were extracted based on the continuity equation for singlet and triplet excitons, and the corresponding luminance characteristics of the devices were calculated. The results of the electrical and optical characteristics show that there is an optimal concentration for the QDs in the emissive layer of the QD-LEDs.

show abstract

Numerical simulation of multilayer organic light-emitting diodes with host–guest emissive layer: the role of defect states

Cited by 2 publications

References 39 publications

Modeling and numerical simulation of electrical and optical characteristics of a quantum dot light-emitting diode based on the hopping mobility model: Influence of quantum dot concentration

Modeling and numerical simulation of electrical and optical characteristics of a quantum dot light-emitting diode based on the hopping mobility model: Influence of quantum dot concentration

Numerical study of hybrid quantum dot light-emitting diode with different concentration of quantum dots in the emissive layer

Contact Info

Product

Resources

About