Wet-process feasible candlelight OLED

Jou, Jwo‐Huei; Su, Yu-Ting; Liu, Shih-Hao; He, Zhe-Kai; Sahoo, Snehasis; Yu, Henry; Chen, Sun-Zen; Wang, Ching-Wu; Lee, Jia-Ren

doi:10.1039/c6tc01968d

Cited by 31 publications

(29 citation statements)

References 34 publications

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“…In this interval voltage, the A and B motors showed similar results presenting below 4000 rpm, as reported by literature [25][26][27] . The Q motor presented higher values of speed in the same interval of different voltages and for this motive, it was abandoned.…”

Section: Resultssupporting

confidence: 74%

Low cost spinner developed for deposition of thin films used in OLED devices

Santos

Takahashi²,

Takimoto³

et al. 2018

RBAV

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This work aims the development of a compact spinner to be used inside the glove-box chamber to deposition of polymeric thin films used in the build of OLED devices. Initially, ten fans extracted of microcomputers were tested with commercial multi-voltage power supply. Four fans were selected based on the standard deviation of speed. A variable power supply was also built in order to get a more detailed response in terms of electrical current and speed in function of applied voltage. The fan that showed less variation of speed with applied voltage was selected for deposition tests using polymeric photoresist solution on the ITO (indium tin oxide) coated glass. This polymer was deposited by spin-coating at different speeds: 1000, 2000, 3000 and 4000 rpm and dried for the thicknesses measurement revealing good uniformity. Finally, three OLED devices were assembled with 2000 and 3000 rpm and the layers were dried under the same conditions. In the structure of the devices were used the materials deposited layer-by-layer: glass/ITO/PEDOT: PSS/Polyfluorene (PFpf)/Al. The OLED devices revealed blue light electroluminescence. The I-V curves showed better performance for OLED devices mounted at 2000 rpm with higher current density and similar appearance to the diode curve.

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Section: Resultssupporting

confidence: 74%

Low cost spinner developed for deposition of thin films used in OLED devices

Santos

Takahashi²,

Takimoto³

et al. 2018

RBAV

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show abstract

“…In this regard, in December 2018, First‐o‐lite, together with NTHU, launched the first candlelight OLED desk lamp that is blue hazard free as well as also free from Hg, glare and flicker, and providing a sensational pleasant environment. [ 29–31 ] A complete chart of OLED development history has been demonstrated in the Figure .…”

Section: Introductionmentioning

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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“…However, the inorganic fillers may deteriorate the optical transparency of the polymers by light scattering. [ 25–29 ] Thus, it is extremely challenging to achieve the enhancement of thermo‐mechanical property without losing optical transparency. Okahisa et al.…”

Section: Introductionmentioning

confidence: 99%

Optically Transparent and Low‐CTE Polyethersulfone‐Based Nanocomposite Films for Flexible Display

Kim

Lan

Kulkarni

et al. 2020

Adv Materials Inter

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Optically transparent and thermo‐mechanically stable nanocomposite films of polyethersulfone (PESU) and core–shell nanoparticles are prepared by a solvent casting and heat pressing method. As a filler, reactive ZnS‐SiO2 core–shell nanoparticles are prepared by a modified sol–gel process, of which reactive aromatic amine groups are chemically bonded with the polymer matrix. For optical transparency, the shell thickness is adjusted and the core diameter of the core–shell nanoparticles is adjusted to match the refractive index of PESU (nPESU = 1.65). For the composite film with more than 15 wt% of core–shell nanoparticles in PESU, the coefficient of thermal expansion is significantly reduced down to 12 ppm °C−1 in the temperature range of 30–90 °C, which is 80% less than the value of the bare PESU film (≈65 ppm °C−1). Furthermore, their mechanical property is also significantly improved. For 15 and 30 wt%, PESU nanocomposite films show 64 and 74 MPa of yield strength and 1.36 and 2.0 GPa of Young's modulus, respectively, while pure PESU films show only 44 MPa of the yield strength and 0.64 GPa of Young's modulus. Finally, the organic light emitting diode device is demonstrated on the PESU nanocomposite substrate.

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Wet-process feasible candlelight OLED

Abstract: Candlelight-based, blue-hazard free lighting sources are friendly to the human eye, physiology, museum artifacts, ecosystems, the environment, and the night sky.

Cited by 31 publications

References 34 publications

Low cost spinner developed for deposition of thin films used in OLED devices

Low cost spinner developed for deposition of thin films used in OLED devices

Approaches for Long Lifetime Organic Light Emitting Diodes

Optically Transparent and Low‐CTE Polyethersulfone‐Based Nanocomposite Films for Flexible Display

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