Roll-To-Roll nanoimprinted backlight devices

Tapio Mäkelä, Tomi Haatainen, Jouni Ahopelto, Jori Oravasaari, Tero Tuohioja, Kari Rinko

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Roll-to-roll nanoimprinting (RRNIL) or roll-to-roll hot embossing is relatively simple high volume manufacturing process which leads to low-cost devices. Thermal RRNIL process requires a bendable stamp, flexible substrate and roll-to-roll printing machine. The potential of RRNIL on flexible polymer films has been studied actively in the last few years. In this work we demonstrate the fabrication of backlight device on 50 mm wide and 95 micron thick cellulose acetate (CA) web (from Clarifoil). Optical binary grating design and Ni-mold were produced by Modines Ltd.. The size of backlight structure is 30 mm x 60 mm consisting a blocks of 5 micron wide cavities as shown. More than 500 devices as printed on CA-film in continuous roll-to-roll process. Printing speed was varied from 0.1 to 1.0 m/min when pressure were maximized at 118 oC, which is close to the glass transition temperature(125 oC) of CA film. The pressure of ca. 20 MPa was applied in the process. These parameters were optimized for continuous printing process. Higher temperatures or pressures can lead to a break of the web, which prevents continuous processing. In this process we have used a custom made nanoimprinter device. The quality of the roll-to-roll imprinted binary gratings was analyzed by a number of printed devices. The structure depth in the Ni-mold is 1.5 micron, while the structure depth is 1.2 micron in the CA-web respectively. No major changes can be seen among first 100 printed structures. The shape and dept of the printed structures proves also, that Ni-stamp can be used at least 100 times without damages. In the experiments no anti-adhesion treatment was used. The structures have been analyzed using optical microscopy, confocal microscopy and AFM.
Original languageEnglish
Title of host publicationConference Program and Proceedings
Subtitle of host publication9th International Conference NNT: Nanoimprint & Nanoprint Technology
Pages50
Publication statusPublished - 2010
MoE publication typeNot Eligible
Event9th International Conference on Nanoimprint and Nanoprint Technology, NNT 2010 - Öresund, Copenhagen, Denmark
Duration: 13 Oct 201015 Oct 2010
Conference number: 9

Conference

Conference9th International Conference on Nanoimprint and Nanoprint Technology, NNT 2010
Abbreviated titleNNT 2010
CountryDenmark
CityCopenhagen
Period13/10/1015/10/10

Fingerprint

cellulose
acetates
printing
gratings
microscopy
embossing
glass transition temperature
adhesion
manufacturing
atomic force microscopy
damage
cavities
fabrication
polymers

Keywords

  • Nanoimprinting
  • UV-NIL
  • roll-to-roll

Cite this

Mäkelä, T., Haatainen, T., Ahopelto, J., Oravasaari, J., Tuohioja, T., & Rinko, K. (2010). Roll-To-Roll nanoimprinted backlight devices. In Conference Program and Proceedings: 9th International Conference NNT: Nanoimprint & Nanoprint Technology (pp. 50)
Mäkelä, Tapio ; Haatainen, Tomi ; Ahopelto, Jouni ; Oravasaari, Jori ; Tuohioja, Tero ; Rinko, Kari. / Roll-To-Roll nanoimprinted backlight devices. Conference Program and Proceedings: 9th International Conference NNT: Nanoimprint & Nanoprint Technology. 2010. pp. 50
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Mäkelä, T, Haatainen, T, Ahopelto, J, Oravasaari, J, Tuohioja, T & Rinko, K 2010, Roll-To-Roll nanoimprinted backlight devices. in Conference Program and Proceedings: 9th International Conference NNT: Nanoimprint & Nanoprint Technology. pp. 50, 9th International Conference on Nanoimprint and Nanoprint Technology, NNT 2010, Copenhagen, Denmark, 13/10/10.

Roll-To-Roll nanoimprinted backlight devices. / Mäkelä, Tapio; Haatainen, Tomi; Ahopelto, Jouni; Oravasaari, Jori; Tuohioja, Tero; Rinko, Kari.

Conference Program and Proceedings: 9th International Conference NNT: Nanoimprint & Nanoprint Technology. 2010. p. 50.

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

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AU - Mäkelä, Tapio

AU - Haatainen, Tomi

AU - Ahopelto, Jouni

AU - Oravasaari, Jori

AU - Tuohioja, Tero

AU - Rinko, Kari

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N2 - Roll-to-roll nanoimprinting (RRNIL) or roll-to-roll hot embossing is relatively simple high volume manufacturing process which leads to low-cost devices. Thermal RRNIL process requires a bendable stamp, flexible substrate and roll-to-roll printing machine. The potential of RRNIL on flexible polymer films has been studied actively in the last few years. In this work we demonstrate the fabrication of backlight device on 50 mm wide and 95 micron thick cellulose acetate (CA) web (from Clarifoil). Optical binary grating design and Ni-mold were produced by Modines Ltd.. The size of backlight structure is 30 mm x 60 mm consisting a blocks of 5 micron wide cavities as shown. More than 500 devices as printed on CA-film in continuous roll-to-roll process. Printing speed was varied from 0.1 to 1.0 m/min when pressure were maximized at 118 oC, which is close to the glass transition temperature(125 oC) of CA film. The pressure of ca. 20 MPa was applied in the process. These parameters were optimized for continuous printing process. Higher temperatures or pressures can lead to a break of the web, which prevents continuous processing. In this process we have used a custom made nanoimprinter device. The quality of the roll-to-roll imprinted binary gratings was analyzed by a number of printed devices. The structure depth in the Ni-mold is 1.5 micron, while the structure depth is 1.2 micron in the CA-web respectively. No major changes can be seen among first 100 printed structures. The shape and dept of the printed structures proves also, that Ni-stamp can be used at least 100 times without damages. In the experiments no anti-adhesion treatment was used. The structures have been analyzed using optical microscopy, confocal microscopy and AFM.

AB - Roll-to-roll nanoimprinting (RRNIL) or roll-to-roll hot embossing is relatively simple high volume manufacturing process which leads to low-cost devices. Thermal RRNIL process requires a bendable stamp, flexible substrate and roll-to-roll printing machine. The potential of RRNIL on flexible polymer films has been studied actively in the last few years. In this work we demonstrate the fabrication of backlight device on 50 mm wide and 95 micron thick cellulose acetate (CA) web (from Clarifoil). Optical binary grating design and Ni-mold were produced by Modines Ltd.. The size of backlight structure is 30 mm x 60 mm consisting a blocks of 5 micron wide cavities as shown. More than 500 devices as printed on CA-film in continuous roll-to-roll process. Printing speed was varied from 0.1 to 1.0 m/min when pressure were maximized at 118 oC, which is close to the glass transition temperature(125 oC) of CA film. The pressure of ca. 20 MPa was applied in the process. These parameters were optimized for continuous printing process. Higher temperatures or pressures can lead to a break of the web, which prevents continuous processing. In this process we have used a custom made nanoimprinter device. The quality of the roll-to-roll imprinted binary gratings was analyzed by a number of printed devices. The structure depth in the Ni-mold is 1.5 micron, while the structure depth is 1.2 micron in the CA-web respectively. No major changes can be seen among first 100 printed structures. The shape and dept of the printed structures proves also, that Ni-stamp can be used at least 100 times without damages. In the experiments no anti-adhesion treatment was used. The structures have been analyzed using optical microscopy, confocal microscopy and AFM.

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KW - UV-NIL

KW - roll-to-roll

M3 - Conference abstract in proceedings

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Mäkelä T, Haatainen T, Ahopelto J, Oravasaari J, Tuohioja T, Rinko K. Roll-To-Roll nanoimprinted backlight devices. In Conference Program and Proceedings: 9th International Conference NNT: Nanoimprint & Nanoprint Technology. 2010. p. 50