Mask-free photolithographic exposure using a matrix-addressable micropixellated AllnGaN ultraviolet light-emitting diode

C.W. Jeon, E. Gu, M.D. Dawson

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41 Citations (Scopus)


We report the integration of a UV-curable polymer microlens array onto a matrix-addressable, 368-nm-wavelength, light-emitting diode device containing 64×64 micropixel elements. The geometrical and optical parameters of the microlenses were carefully chosen to allow the highly divergent emission from each micropixel to be collimated into a narrow beam of about 8-µm diam, over a distance of more than 500 µm. This device is demonstrated as a photolithographic exposure tool, where the pattern-programmable array plays the role both of light source and photomask. A simple pattern comprised of two disks having 16-µm diam and 30-µm spacing was transferred into an i-line photoresist.
Original languageEnglish
JournalApplied Physics Letters
Issue number221105
Publication statusPublished - 2005


  • aluminium compounds
  • indium compounds
  • gallium compounds
  • semiconductors
  • light emitting diodes
  • microlenses
  • optical polymers
  • etching
  • photonics
  • optics

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