Impact of different layers on performance of OLED

Negi, Shubham; Mittal, Poornima; Kumar, Brijesh

doi:10.1007/s00542-018-3918-y

Cited by 69 publications

(46 citation statements)

References 25 publications

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“…As a result, holes (being the faster moving charge carrier) crossed the emission layer (EML) to reach the cathode and did not take part in recombination. 4 HBL was proposed as solution to this problem. 10 The HBL was placed next to the EML, thereby restricting the movement of holes.…”

Section: Background Of Research Workmentioning

confidence: 99%

“…For further enhancing the device performance, a double HBL architecture was utilized that included two HBLs: BAlq and BPhen (Device E). 4,10 The complete structure of Device E is shown in Figure 1. Table 1 enlists the dimensions of Device E along with Device D (previous device dimensions can be inferred from Device D).…”

Section: Impact Of Different Layers On the Performance Of Oledmentioning

confidence: 99%

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Numerical modeling and parameters extraction of novel triple hole block layer‐based organic light‐emitting diode for display

2020

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Depth knowledge regarding device internal physics is very essential, and its application aids to develop innovative methods for device performance enhancement. Taking this point into cognizance, the present article introduced a novel triple hole block layer (HBL) organic light-emitting diode (OLED) architecture and its analytical modeling based on Poisson's equation and drift diffusion equation. Compared with multilayered OLED and double HBL structure, the novel device depicted improvement of luminescence performance by 47% and 30% correspondingly, at a driving voltage of 18 V. Analytical analysis is undertaken to extract internal device parameters such as electron and hole concentration, their mobility, and current density. Analysis results revealed the reason for improved performance is higher electron concentration (2.53 * 10 18), 5% increase over multilayered OLED. Additionally, it is observed that mismatch in electron and hole concentration is small in novel triple HBL OLED and compared with multilayered OLED, the mismatch is lower by 63%.

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Section: Background Of Research Workmentioning

confidence: 99%

Section: Impact Of Different Layers On the Performance Of Oledmentioning

confidence: 99%

Numerical modeling and parameters extraction of novel triple hole block layer‐based organic light‐emitting diode for display

2020

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“…Organic light emitting diodes have become an established technology in the display market because they achieve very high luminous efficiency, low‐power consumption, and long lifetime thanks to a complex multilayer architecture . Unlike thermal evaporation, solution processes are lowering production costs due to their high material usage efficiency and easy scalability at different sizes .…”

Section: Ijp Solvents Used To Process Polymer X‐pomentioning

confidence: 99%

Improved thin film stability of differently formulated, printed, and crosslinked polymer layers against successive solvent printing

Hibon

Seggern

Tseng

et al. 2020

J of Applied Polymer Sci

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Interface control remains a top challenge of solution-processed organic light emitting diodes (OLED) stacks since the device performance heavily relies on it. Film stability of an inkjet deposited and crosslinked layer against subsequent exposure to a suitable inkjet printed solvent has been investigated. Impact of processing solvent (solvent used to prepare the polymer layer) on solution-cast thin film properties has already been shown for polymer films. To our knowledge, this study is the first one analyzing thin films stability against solvent exposure using technology relevant materials processed via inkjet printing (IJP). The outcome of this research showed that the stability of the crosslinked films is affected by the solvent used for ink formulation. These findings are of great interest for multilayered semiconductors devices, such as OLEDs, field-effect transistors and dye-sensitized solar cells. Differential scanning calorimetry (DSC) was used to quantify the efficiency of the polymer crosslinking reaction in pure powder and in thin films, as processed from different solvents. Crosslinking efficiency measured by DSC correlated well with the deformation induced by the solvent and observed on layer surfaces. The interaction in solution between polymer and solvent has also been evaluated to explain its impact on thin film stability against successive solvent printing.

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“…The dimension of these layers is enlisted in Table 1. Each layer in the architecture serves a specific purpose, for example, The multilayered OLED is analysed with the help of Silvaco ATLAS tool [9,18], and its performance parameters are extracted and validated with the fabricated experimental results [15]. After that, internal analysis of multilayered OLED is carried out for indepth understanding of the internal physics of the device.…”

Section: Multilayered Oled Architecturementioning

confidence: 99%

Analytical modelling and parameters extraction of multilayered OLED

Negi

Mittal

Kumar

2019

IET Circuits, Devices & Systems

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This research study investigates electrical performance of the multilayered organic light-emitting diode (OLED) with a focus on the role of charge injection, transport and emission layers. Device parameters; luminescence and current density are extracted using Silvaco ATLAS numerical device simulator and validated through the fabricated experimental results with a minor deviation of 3%. Furthermore, a mathematical model is applied to extract other device parameters such as electric field, charge carrier mobility, concentration and current density. Additionally, the multilayered device architecture is critically analysed through cut line methodology to better comprehend the internal device physics in terms of hole-electron mobility, concentration and their recombination. Subsequently, the performance parameters extracted using analytical model are compared with the results of internal analysis and a close match is observed. These results prove the Poole-Frenkel mobility-dependent behaviour in the OLEDs that varies following electric field. Analyses also highlight high electron and hole concentrations in the vicinity of the emission layer as a reason of high luminescence in the multilayered OLED, directly following the Langevin's theory of recombination in organic semiconductors. These analyses highlight the impact of different layers in the OLEDs and thus open up new horizons to further performance improvement in these devices.

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Impact of different layers on performance of OLED

Cited by 69 publications

References 25 publications

Numerical modeling and parameters extraction of novel triple hole block layer‐based organic light‐emitting diode for display

Numerical modeling and parameters extraction of novel triple hole block layer‐based organic light‐emitting diode for display

Improved thin film stability of differently formulated, printed, and crosslinked polymer layers against successive solvent printing

Analytical modelling and parameters extraction of multilayered OLED

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