21.3: A New Patterning Method for Full‐Color Polymer Light‐Emitting Devices: Laser Induced Thermal Imaging (LITI)

Lee, Seong Taek; Lee, Jun Yeob; Kim, Mu Hyun; Suh, Min Chul; Kang, Tae Min; Choi, Young-Wook; Park, Joon‐Young; Kwon, Jang Hyuk; Chung, Ho Kyoon; Baetzold, John P.; Bellmann, Erika; Savvateev, Vadim; Wolk, Martin; Webster, Steven

doi:10.1889/1.1830899

Cited by 26 publications

(18 citation statements)

References 2 publications

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“…There are several laser methods for OLED fabrication, and among these, laser thermal printing [1][2][3][4][5][6] and laser sublimation [7,8] are the main methods. A laser thermal printing method, which was originally developed for fabrication of the color filters for the LCD panel, was suggested as an alternative method of OLED fabrication [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Beam Trajectory on Donor Plate in Laser Induced Thermal Printing Process

Lee

Kwon

et al. 2011

Journal of the Optical Society of Korea

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Organic (Alq3) film, which was coated on a donor plate, was transferred to an organic light emitting diode (OLED) substrate with help of heat generated by a dithering laser beam. The laser beam was diffracted in an acousto-optic modulator (AOM), then focused on the laser-to-heat converting layer of the donor plate; the focused spot followed trajectories guided by rotation of a Galvano-mirror. Three different functional waveforms, sine wave, square wave, and saw tooth wave were applied to the AOM as modulation signal to generate the dithering beam. The fluorescence microscope images of the donor plate showed that the patterns of removed Alq3 film were affected considerably by the modulation waveforms and the phase difference between adjacent dithering beams. Further, the printed images of Alq3 film on the OLED substrate were different from the patterns of removed Alq3 film. Atomic force microscope images indicated that not only direct transfer but also deposition by sublimated vapor of Alq3 contributed to the pattern formation. Printed patterns affected considerably the electricity-to-light conversion characteristics of OLEDs. For uniform transfer, not only the phase relation of dithering beam lines but also adequate waveform were important.

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Section: Introductionmentioning

confidence: 99%

Effect of Laser Beam Trajectory on Donor Plate in Laser Induced Thermal Printing Process

Lee

Kwon

et al. 2011

Journal of the Optical Society of Korea

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“…LITI is known as the more applicable method than inkjet or thermal evaporation methods for large area, high resolution OLED (organic light emitting diode) fabrication [4].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore non-uniformity of evaporated material from the surface degrades the precision and the sharpness of the marked letters or sign. The problem caused by the Gaussian beam is also an important issue in the LITI system because the system also uses laser energy for local heating of the donor film to detach organic layer [4].…”

Section: Introductionmentioning

confidence: 99%

“…In such devices, the beam shaping optics is usually placed between the beam expander and the Galvanomirror. Various optics such as lens set [6], micro lens array [7], diffractive optical elements [8], random phase plate [9], light guiding plate [10], and acousto-optic modulator (AOM) [4] have been used for beam shaping. The lens set method is frequently employed in commercially developed marking systems.…”

Section: Introductionmentioning

confidence: 99%

“…Acousto-optic method has been used in the LITI system [4]. The beam is usually scanned by a Galvanomirror.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Laser Beam Shaping Using Hollow Optical Fiber and Its Application in Laser Induced Thermal Printing

Yi¹,

Lee²,

Park³

et al. 2009

Journal of the Optical Society of Korea

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A Gaussian beam of single mode fiber laser was changed into a ring-shaped pattern after it was transmitted through the hollow optical fiber. The ring-shaped beam was focused on a plane by an f-ɵ lens and it was scanned by a Galvano-mirror. The spatial profile of laser energy incident on a plane had two peaks at both sides of the scanned linear track. The profile was compared with the result obtained when the Gaussian beam was dithered transversely by an acousto-optic modulator. It is found that hollow optical fiber beam shaper can replace acousto-optic beam dithering device which is employed in a laser induced thermal printing system.

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OLED Fabrication Process

Koden

2016

OLED Displays and Lighting

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21.3: A New Patterning Method for Full‐Color Polymer Light‐Emitting Devices: Laser Induced Thermal Imaging (LITI)

Cited by 26 publications

References 2 publications

Effect of Laser Beam Trajectory on Donor Plate in Laser Induced Thermal Printing Process

Effect of Laser Beam Trajectory on Donor Plate in Laser Induced Thermal Printing Process

Laser Beam Shaping Using Hollow Optical Fiber and Its Application in Laser Induced Thermal Printing

OLED Fabrication Process

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