Leakage-free solution-processed organic light-emitting diode using a ternary host with single-diode emission area up to 6 × 11.5 cm<sup>2</sup>

Liao, Si Yi; Su, Hsiao Tso; Hsiao, Yung Hung; Chang, Yu Fan; Chang, Chiung Wen; Niu, Mu Chun; Meng, Hsin Fei; Yen, Chun; Chao, Yu Chiang; Chang, Ching‐Ping; Zan, Hsiao Wen; Horng, Sheng Fu

doi:10.1039/c8ra10363a

RSC Adv.

2019

DOI: 10.1039/c8ra10363a

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Leakage-free solution-processed organic light-emitting diode using a ternary host with single-diode emission area up to 6 × 11.5 cm²

Si Yi Liao¹,

Hsiao Tso Su²,

Yung Hung Hsiao

et al.

Abstract: OLEDs with an emission layer consisting of ternary mixed host materials are prepared with operation of over 1600 hours.

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Cited by 6 publications

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“…Moreover, the TPPO molecule is insulating in nature. And the SPPO13 molecule shows good electronic conductivity and is used as an ETL material in some reports. − In order to evaluate their electronic conductivity experimentally, electron-only devices with a configuration of ITO/LiF (1 nm)/TPPO (or SPPO13) (100 nm)/LiF (1 nm)/Ag were fabricated, and the corresponding data are shown in Figure S2. According to the fitting results, the zero-field carrier mobilities of TPPO and SPPO13 are different by several orders of magnitude.…”

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confidence: 98%

Conductive Phosphine Oxide Passivator Enables Efficient Perovskite Light-Emitting Diodes

Zhao

Qin

et al. 2022

Nano Lett.

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Recently, surface passivation has been proved to be an essential approach for obtaining efficient and stable perovskite light-emitting diodes (Pero-LEDs). Phosphine oxides performed well as passivators in many reports. However, the most commonly used phosphine oxides are insulators, which may inhibit carrier transport between the perovskite emitter and charge-transporter layers, limiting the corresponding device performance. Here, 2,7-bis(diphenylphosphoryl)-9,9′-spirobifluorene (SPPO13), a conductive molecule with two phosphine oxide functional groups, is introduced to modify the perovskite emitting layer. The bifunctional SPPO13 can passivate the nonradiative defects of perovskite and promote electron injection at the interface of perovskite emitter and electron-transporter layers. As a result, the corresponding Pero-LEDs obtain a maximum external quantum efficiency (EQE) of 22.3%. In addition, the Pero-LEDs achieve extremely high brightness with a maximum of around 190 000 cd/m2.

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mentioning

confidence: 98%

Conductive Phosphine Oxide Passivator Enables Efficient Perovskite Light-Emitting Diodes

Zhao

Qin

et al. 2022

Nano Lett.

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Coverage Performance of PEDOT:PSS Against Particles on a Substrate for OLEDs

Kurosawa

Murakami

Takahashi

et al. 2022

Adv Materials Inter

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OLEDs, the manufacturing process and production yields should be improved to reduce the overall cost.The structure of an OLED device consists of an organic thin film layered between two electrodes (anode and cathode), and is a self-emitting device that emits light when holes and electrons injected from the electrodes recombine in the light-emitting layer upon application of a DC voltage. [1] A transparent anode (e.g., indium-tin-oxide (ITO)) is formed on a glass or other substrate, on which a hole injection layer (HIL), hole transport layer (HTL), emission layer (EML), electron transport layer (ETL), electron injection layer (EIL), and cathode (e.g., aluminum (Al)) are stacked. An organic layer is fabricated by a vacuum process such as vacuum deposition [2] or a solution process using spin-coating, slot-die coating, and ink-jet printing. [3][4][5][6] Each organic layer is very thin, with a total thickness of ≈100-200 nm. However, in contrast to the film thickness, it has a large emitting area of ≈10 × 10 cm 2 , especially for lighting applications. Owing to the low thickness of the device, even a small amount of microscale dust particles on such a large substrate causes defects, such as electrical short circuits and lower production yields of OLED panels. [7,8] Therefore, to solve this problem in OLED panel manufacturing, a system that strictly controls the microscale particles throughout the manufacturing process is needed.Although dust-induced short-circuit defects are a significant issue in the production of OLED panels, there are few reports on the mechanism. Based on the existing literature on the shortcircuit defects reported, we classified the factors of shortcircuit defects in OLED panels and their prevention methods by their fabrication process (Table 1). Several phenomena can cause short-circuit defects in the series of processes used for the fabrication of OLEDs. First, in the anodic sputtering process on a clean substrate, the flake particles generated from the sputtering target cause short-circuit defects. It has been reported that these factors can be prevented by smoothing the spattering anode (R peak-to-valley (R pv ) < 20 nm). [9][10][11] Moreover, in the electrode patterning process (photolithography), the steep step of the electrode edge, the resist residue after development, and resist mist on the substrate in photolithography are factors that can cause short-circuit defects. To prevent these problems, the formation of edge covers using insulators [12,13] and optimization of the photolithography process [14] have been reported.Short-circuit defects caused by microscale dust particles in organic lightemitting diodes (OLEDs) cause a decrease in production yield and hinder cost reduction. An organic layer coating by solution process is used to prevent short-circuit defects of particles on a substrate. In this study, the coverage properties of a coated organic layer on size-controlled particles are revealed. The surface of the substrate with size-controlled SiO 2 particles with a diameter of 0.2-5...

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Exciplex-driven blue OLEDs: unlocking multifunctionality applications

Weber,

Morgenstern,

Beer

et al. 2024

Appl. Phys. A

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We present the development of multifunctional blue-emission organic light-emitting diodes (OLEDs) using TADF-exciplex materials. These OLEDs exhibit sensitivity to external stimuli and achieve a maximum external quantum efficiency (EQE) of 11.6% through partly liquid processing. This technique allows for large-scale production on arbitrary geometries.The potential multifunctionality of the devices arises from their response to low external magnetic fields (up to 100 mT) with an efficiency up to 2.5% for magnetoconductance, while maximum magneto-electroluminescence effects of 4.1% were detected. We investigated novel aspects, including the utilization of two organic materials without further doping and the investigation of the impact of 2,2ʹ,2″-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) processing in liquid and vapor form. The insights gained provide a fundamental understanding regarding the applicability of exciplex (EX) materials for fully solution-processed OLEDs through a deliberate omission of doping. Our work represents a significant advancement on the path towards multifunctional OLED technology, with potential applications in cost-efficient, scalable organic full-color displays and advanced sensing system.

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Leakage-free solution-processed organic light-emitting diode using a ternary host with single-diode emission area up to 6 × 11.5 cm²

Abstract: OLEDs with an emission layer consisting of ternary mixed host materials are prepared with operation of over 1600 hours.

Cited by 6 publications

References 15 publications

Conductive Phosphine Oxide Passivator Enables Efficient Perovskite Light-Emitting Diodes

Conductive Phosphine Oxide Passivator Enables Efficient Perovskite Light-Emitting Diodes

Coverage Performance of PEDOT:PSS Against Particles on a Substrate for OLEDs

Exciplex-driven blue OLEDs: unlocking multifunctionality applications

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Leakage-free solution-processed organic light-emitting diode using a ternary host with single-diode emission area up to 6 × 11.5 cm2

Abstract: OLEDs with an emission layer consisting of ternary mixed host materials are prepared with operation of over 1600 hours.

Cited by 6 publications

References 15 publications

Conductive Phosphine Oxide Passivator Enables Efficient Perovskite Light-Emitting Diodes

Conductive Phosphine Oxide Passivator Enables Efficient Perovskite Light-Emitting Diodes

Coverage Performance of PEDOT:PSS Against Particles on a Substrate for OLEDs

Exciplex-driven blue OLEDs: unlocking multifunctionality applications

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Product

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Leakage-free solution-processed organic light-emitting diode using a ternary host with single-diode emission area up to 6 × 11.5 cm²