Formation of high-purity organic thin films by gas flow deposition and the effect of impurities on device characteristics

Tsugita, Kohei; Edura, Tomohiko; Yahiro, Masayuki; Adachi, Chihaya

doi:10.1016/j.displa.2013.08.008

Cited by 11 publications

(8 citation statements)

References 9 publications

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“…[204] Tsugita et al fabricated high purity organic films via gas flow deposition method (GFD). [205] According to Jain et al, [206] Salati et al, [207] and Pardo et al [208] recrystallization and vacuum deposition are efficient methods to purify both organometallic and organic compounds used in OLEDs.…”

Section: Presence Of Impuritiesmentioning

confidence: 99%

Approaches for Long Lifetime Organic Light Emitting Diodes

et al. 2020

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Organic light emitting diodes (OLEDs) have been well known for their potential usage in the lighting and display industry. The device efficiency and lifetime have improved considerably in the last three decades. However, for commercial applications, operational lifetime still lies as one of the looming challenges. In this review paper, an in-depth description of the various factors which affect OLED lifetime, and the related solutions is attempted to be consolidated. Notably, all the known intrinsic and extrinsic degradation phenomena and failure mechanisms, which include the presence of dark spot, high heat during device operation, substrate fracture, downgrading luminance, moisture attack, oxidation, corrosion, electron induced migrations, photochemical degradation, electrochemical degradation, electric breakdown, thermomechanical failures, thermal breakdown/degradation, and presence of impurities within the materials and evaporator chamber are reviewed. Light is also shed on the materials and device structures which are developed in order to obtain along with developed materials and device structures to obtain stable devices. It is believed that the theme of this report, summarizing the knowledge of mechanisms allied with OLED degradation, would be contributory in developing better-quality OLED materials and, accordingly, longer lifespan devices.

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Section: Presence Of Impuritiesmentioning

confidence: 99%

Approaches for Long Lifetime Organic Light Emitting Diodes

et al. 2020

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“…Furthermore, these essentially linear sources [27] are scalable to larger sizes, figure 3. Such systems have been shown to produce films of similar morphology and electro-optical properties to those produced by conventional thermal evaporation and are adaptable for OTFT production [28]. This is exemplified by the fabrication of pentacene devices exhibiting a hole mobility of 1.5 cm 2 V −1 s −1 [29,30] using, for example, the showerhead arrangement developed at IMEC [30] and shown in figure 4.…”

Section: Underpinning Researchmentioning

confidence: 99%

Vacuum-thermal-evaporation: the route for roll-to-roll production of large-area organic electronic circuits

Taylor

2015

Semicond. Sci. Technol.

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Surprisingly little consideration is apparently being given to vacuum-evaporation as the route for the roll-to-roll (R2R) production of large-area organic electronic circuits. While considerable progress has been made by combining silicon lithographic approaches with solution processing, it is not obvious that these will be compatible with a low-cost, high-speed R2R process. Most efforts at achieving this ambition are directed at conventional solution printing approaches such as inkjet and gravure. This is surprising considering that vacuum-evaporation of organic semiconductors (OSCs) is already used commercially in the production of organic light emitting diode displays. Beginning from a discussion of the materials and geometrical parameters determining transistor performance and drawing on results from numerous publications, this review makes a case for vacuum-evaporation as an enabler of R2R organic circuit production. The potential of the vacuum route is benchmarked against solution approaches and found to be highly competitive. For example, evaporated small molecules tend to have higher mobility than printed OSCs. High resolution metal patterning on plastic films is already a low-cost commercial process for high-volume packaging applications. Similarly, solvent-free flash-evaporation and polymerization of thin films on plastic substrates is also a high-volume commercial process and has been shown capable of producing robust gate dielectrics. Reports of basic logic circuit elements produced in a vacuum R2R environment are reviewed and shown to be superior to allsolution printing approaches. Finally, the main issues that need to be resolved in order to fully develop the vacuum route to R2R circuit production are highlighted.

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“…50,51) Systems for rapid deposition of active layers in organic light emitting diodes using organic vapour phase deposition (OVPD) are also well-advanced. 52) Furthermore, OVPD has been used for OFET production 53) and may be combined with highresolution masks for patterning structures 54) or, alternatively, a small-diameter vapour jet used for local deposition of the semiconductor.…”

Section: R2r Processingmentioning

confidence: 99%

Progress in organic integrated circuit manufacture

Taylor

2015

Jpn. J. Appl. Phys.

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This review article focuses on the development of processes for the manufacture of organic electronic circuits. Beginning with the first report of an organic transistor it highlights the key developments leading to the successful manufacture of microprocessors and other complex circuits incorporating organic transistors. Both batch processing (based on silicon integrated circuit technology) as well as mass-printing, roll-to-roll (R2R) approaches are discussed. Currently, the best circuit performances are achieved using batch processing. It is suggested that an emerging, large mass-market for electronic tags may dictate that R2R manufacture will likely be required to meet the high throughput rates needed. However, significant improvements in resolution and registration are necessary to achieve increased circuit operating speeds.

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Formation of high-purity organic thin films by gas flow deposition and the effect of impurities on device characteristics

Cited by 11 publications

References 9 publications

Approaches for Long Lifetime Organic Light Emitting Diodes

Approaches for Long Lifetime Organic Light Emitting Diodes

Vacuum-thermal-evaporation: the route for roll-to-roll production of large-area organic electronic circuits

Progress in organic integrated circuit manufacture

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