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

Title
Effect of Laser Beam Trajectory on Donor Plate in Laser Induced Thermal Printing Process
Author(s)
이종훈이광원[이광원]권진혁이시진[이시진]박이순[박이순]
Issue Date
201112
Publisher
OPTICAL SOC KOREA
Citation
JOURNAL OF THE OPTICAL SOCIETY OF KOREA, v.15, no.4, pp.362 - 367
Abstract
Organic (Alq(3)) 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 Alq(3) film were affected considerably by the modulation waveforms and the phase difference between adjacent dithering beams. Further, the printed images of Alq(3) film on the OLED substrate were different from the patterns of removed Alq(3) film. Atomic force microscope images indicated that not only direct transfer but also deposition by sublimated vapor of Alq(3) 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.
URI
http://hdl.handle.net/YU.REPOSITORY/24207http://dx.doi.org/10.3807/JOSK.2011.15.4.362
ISSN
1226-4776
Appears in Collections:
이과대학 > 물리학과 > Articles
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