Modification effect of hole injection layer on efficiency performance of wet-processed blue organic light emitting diodes

Swayamprabha, Sujith Sudheendran; Hsueh, Tsung-Chia; Chavhan, Sudam; Yadav, Rohit Ashok Kumar; Lee, Jia-Ren; Kesavan, Kiran Kishore; Chen, Sun-Zen; Wang, Ching-Wu; Jou, Jwo‐Huei

doi:10.1016/j.orgel.2021.106084

Cited by 5 publications

(4 citation statements)

References 46 publications

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“…9 This has been demonstrated in several works in which solution-processed PEDOT:PSS layers (post-treated with benzoid acid 10 and acetone 11 ) were incorporated into OLEDs, revealing an enhanced luminance. 11 improve the performance of OLEDs, it still has several drawbacks in terms of anisotropic charge injection, hygroscopicity, and acidity, which thus lead to device degradation and limit operational stability. 12 In addition, the PSS counterion restricts the electrical conductivity of PEDOT due to its insulating nature, resulting in undesirable changes on various properties such as work function and band alignement.…”

Section: Introductionmentioning

confidence: 87%

“…Besides, polystyrenesulfonate (PSS)-doped poly(3,4-ethylenedioxythiophene) (PEDOT) is commonly used in OLEDs to promote hole injection and thus improve light coupling and device efficiency . This has been demonstrated in several works in which solution-processed PEDOT:PSS layers (post-treated with benzoid acid and acetone) were incorporated into OLEDs, revealing an enhanced luminance . Although PEDOT:PSS helps to improve the performance of OLEDs, it still has several drawbacks in terms of anisotropic charge injection, hygroscopicity, and acidity, which thus lead to device degradation and limit operational stability .…”

Section: Introductionmentioning

confidence: 99%

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Single-Step PEDOT Deposition by oCVD for ITO-Free Deep Blue OLEDs

Sekkat,

El Housseiny,

Poupaki

et al. 2023

ACS Appl. Polym. Mater.

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Organic light-emitting diodes (OLEDs) are emerging technologies for potential lighting and display applications. Transparent conductive electrodes (TCEs) play a crucial role in enabling the functionality and increased performance of these particular devices. Despite their widespread use, indium tin oxide (ITO) thin films have several significant drawbacks, including material scarcity, high costs associated with both materials and fabrication processes, and limited flexibility. To address these issues, we thoroughly investigate the deposition of poly(3,4-ethylenedioxythiophene) (PEDOT) thin films as a promising alternative to ITO using a single-step and dry method named oxidative chemical vapor deposition (oCVD). The impact of increasing the substrate temperature from 110 to 190 °C on the film’s structure and properties was revealed with an increase in the film conductivity to over 1600 S/cm at 170 °C and a total transmittance of 97% in the visible range. This increase was attributed to a change in the molecular structure of the conjugated polymer from benzoid to quinoid as revealed by Raman and FTIR measurements. The XPS results demonstrated an increase in the doping ratio with Cl-containing species and a reduction of impurities. GIXRD, HR-TEM, and AFM measurements indicated a smooth surface and a highly face-on orientation for all temperatures. The optimized TCE layers were successfully integrated into deep blue OLED devices emitting at 436 nm with stable color Commission Internationale de l’Energie (CIE) coordinates of (0.15, 0.08) under variation of the applied current. A satisfactory performance (72.1 cd/m2 and 0.86 W/sr·m2 at 10 mA cm–2) and an external quantum efficiency (EQE) of 1.04% were achieved. These results are quite promising, as OLEDs based on PEDOT as a TCE have demonstrated slightly better output performance in terms of luminance and radiance, with an increase in EQE by a factor of 1.7, compared to the reference device based on ITO.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Single-Step PEDOT Deposition by oCVD for ITO-Free Deep Blue OLEDs

Sekkat,

El Housseiny,

Poupaki

et al. 2023

ACS Appl. Polym. Mater.

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“…The former exhibited a 34% reduction in surface hydrophobicity and a 200% increase in conductivity. Moreover, the modified HIL showed high transmittances and low refractive indices [ 58 ].…”

Section: Doped Hole Injection Layermentioning

confidence: 99%

The Optimization of Hole Injection Layer in Organic Light-Emitting Diodes

Xing,

Wu,

Sun

et al. 2024

Nanomaterials

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Organic light-emitting diodes (OLEDs) are widely recognized as the forefront technology for displays and lighting technology. Now, the global OLED market is nearly mature, driven by the rising demand for superior displays in smartphones. In recent years, numerous strategies have been introduced and demonstrated to optimize the hole injection layer to further enhance the efficiency of OLEDs. In this paper, different methods of optimizing the hole injection layer were elucidated, including using a suitable hole injection material to minimize the hole injection barrier and match the energy level with the emission layer, exploring new preparation methods to optimize the structure of hole injection layer, and so on. Meanwhile, this article can help people to understand the current research progress and the challenges still faced in relation to the hole injection layer in OLEDs, providing future research directions to enhance the properties of OLEDs.

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“…Its success is related to its unique optoelectronic properties [2], high and tunable electrical [3,4] and thermoelectrical properties [5][6][7][8][9], and excellent physicochemical stability [10]. In this way, PEDOT:PSS has been used in applications as low consuming organic light-emitting diodes [11,12] and highly effective perovskite solar cells [13,14], which are being highly demanded for developing a more sustainable and greener future.…”

Section: Introductionmentioning

confidence: 99%

Solvent-structured PEDOT:PSS surfaces: fabrication strategies and nanoscale properties

Sanviti

Mester

Hillenbrand

et al. 2021

Preprint

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We present the preparation of nanostructured conducting PEDOT:PSS thin films by solvent vapor annealing (SVA), using the low boiling point solvent tetrahydrofuran (THF). An Atomic Force Microscopy (AFM) study allowed the observation of distinct nanostructure development as a function of solvent exposure time. Moreover, the nanostructures’ physical properties were evaluated by nanomechanical, nanoelectrical, and nano-FTIR measurements. In this way, we were able to differentiate the local response of the developed phases and to identify their chemical nature. The combination of these techniques allowed to demonstrate that exposure to THF is a facile method to effectively and selectively modify the surface nanostructure of PEDOT:PSS, and thereafter its final properties. Moreover, our nanoscale studies provided evidence about the molecular rearrangements that PEDOT:PSS suffers during nanostructure fabrication, a fundamental fact in order to expand the potential applications of this polymer in thermoelectric and optoelectronic devices.

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Modification effect of hole injection layer on efficiency performance of wet-processed blue organic light emitting diodes

Cited by 5 publications

References 46 publications

Single-Step PEDOT Deposition by oCVD for ITO-Free Deep Blue OLEDs

Single-Step PEDOT Deposition by oCVD for ITO-Free Deep Blue OLEDs

The Optimization of Hole Injection Layer in Organic Light-Emitting Diodes

Solvent-structured PEDOT:PSS surfaces: fabrication strategies and nanoscale properties

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