Photo-thermal dual curing of acrylic anchor resins for screen printing

Okamura, Hitoshi; Matoba, Tetsuya; Takada, Kohei; Yamashita, M.; Shirai, Masamitsu; Matsumoto, Akikazu

doi:10.1016/j.porgcoat.2016.01.025

Cited by 15 publications

(15 citation statements)

References 21 publications

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“…AlGaN ternary alloy has a direct bandgap tunable between 3.43 eV and 6.11 eV and is suitable for the fabrication of optical devices with a wavelength range between about 200 nm and 365 nm. In this wavelength range, applications include sterilization [1][2][3][4], ultraviolet (UV) curing and printing [5,6], phototherapy and medical applications [7,8], deodorization by the use of a photocatalyst [9,10], and sensing applications for materials such as urea [11,12]. To date, these applications mainly involve the use of mercury-based lamps.…”

Section: General Overviewmentioning

confidence: 99%

A Review of AlGaN-Based Deep-Ultraviolet Light-Emitting Diodes on Sapphire

Nagasawa¹,

Hirano²

2018

Applied Sciences

184

111

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This paper reviews the progress of AlGaN-based deep-ultraviolet (DUV) light emitting diodes (LEDs), mainly focusing in the work of the authors’ group. The background to the development of the current device structure on sapphire is described and the reason for using a (0001) sapphire with a miscut angle of 1.0° relative to the m-axis is clarified. Our LEDs incorporate uneven quantum wells (QWs) grown on an AlN template with dense macrosteps. Due to the low threading dislocation density of AlGaN and AlN templates of about 5 × 108/cm2, the number of nonradiative recombination centers is decreased. In addition, the uneven QW show high external quantum efficiency (EQE) and wall-plug efficiency, which are considered to be boosted by the increased internal quantum efficiency (IQE) by enhancing carrier localization adjacent to macrosteps. The achieved LED performance is considered to be sufficient for practical applications. The advantage of the uneven QW is discussed in terms of the EQE and IQE. A DUV-LED die with an output of over 100 mW at 280–300 nm is considered feasible by applying techniques including the encapsulation. In addition, the fundamental achievements of various groups are reviewed for the future improvements of AlGaN-based DUV-LEDs. Finally, the applications of DUV-LEDs are described from an industrial viewpoint. The demonstrations of W/cm2-class irradiation modules are shown for UV curing.

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Section: General Overviewmentioning

confidence: 99%

A Review of AlGaN-Based Deep-Ultraviolet Light-Emitting Diodes on Sapphire

Nagasawa¹,

Hirano²

2018

Applied Sciences

184

111

View full text Add to dashboard Cite

show abstract

“…The photo-thermal dual curing technique has attracted much attention due to the enhanced photoreactivity to fabricate specially-controlled and temporally-controlled functional materials [1][2][3][4][5][6]. Thus, significant efforts have focused on designing a photo-thermal dual curing system having excellent chemical and physical properties [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…Based on this point of view, we have developed a photo-thermal dual curing technique to fabricate functional materials [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…We reported the application to screen printing technology using the photo-thermal dual curing system [6]. The new formulation of acrylic anchor resins contains a base polymer, which consists of hydrophilic units and solvent-absorbing units.…”

Section: Introductionmentioning

confidence: 99%

“…As crosslinkers, multifunctional acrylates were employed. The acrylic anchor resins coated on poly(ethylene terephthalate) films were effectively cured by simultaneous photo-irradiation and baking below 80 o C. Using the photo-thermal dual cured anchor layer, an 8-m sized silver circuit was successfully printed without defects on a poly(ethylene terephthalate) film [6].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photo-thermal Dual Curing of Polysilane/diarylfluorene Blends -Fabrication of Films with High and Tunable Refractive Indices-

Okamura

Matsumoto

Minokami

et al. 2018

J. Photopol. Sci. Technol.

Self Cite

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We have developed the crosslinked films of diphenyl-or dinaphthylfluorene having acryl units with polymethylphenylsilane in the presence of a photoradical initiator upon irradiation at 405 nm with thermal treatments at around 100 o C. The photopolymerization of the acrylates effectively enhanced by the photo-thermal dual curing technique. Polysilane moieties were incorporated into the film by the termination reaction between the acrylate radicals and Si radicals generated by the slight photo-decomposition of the Si-Si bonds. We have successfully fabricated the films with high refractive indices (n D : 1.62) and the refractive index values were tunable by irradiation at 254 nm by the effective decomposition of the Si-Si bonds of the polysilanes. The reaction mechanism is discussed based on realtime FT-IR measurements. The prepared films have a high thermal stability (temperature for 5% weight loss, T d5 : 300 o C).

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AlGaN‐based ultraviolet light‐emitting diodes: challenges and opportunities

2020

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Due to low power consumption, tunable wavelength and long lifetime ultraviolet light‐emitting diodes (UV LEDs) have found many applications in different fields such as health care, water disinfection, agriculture. In this review, we report different problems that lead to low external quantum efficiency of UV LEDs. We also report various challenges in the growth process of the UV LEDs such as increase in the dislocation density, which affects the optoelectronic performance of the devices. We also report the analysis of the two modes of light polarization, i.e. transverse electric and transverse magnetic in UV LEDs. Moreover, we also summarize various state‐of‐the‐art reported external quantum efficiencies, light output power and peak emission wavelengths in the three UV wavelength regimes, i.e. UV‐A, UV‐B and UV‐C LEDs.

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Photo-thermal dual curing of acrylic anchor resins for screen printing

Cited by 15 publications

References 21 publications

A Review of AlGaN-Based Deep-Ultraviolet Light-Emitting Diodes on Sapphire

A Review of AlGaN-Based Deep-Ultraviolet Light-Emitting Diodes on Sapphire

Photo-thermal Dual Curing of Polysilane/diarylfluorene Blends -Fabrication of Films with High and Tunable Refractive Indices-

AlGaN‐based ultraviolet light‐emitting diodes: challenges and opportunities

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