Nitride deep-ultraviolet light-emitting diodes with microlens array

M. Khizar, Z. Y. Fan, K. H. Kim, J. Y. Lin, H. X. Jiang

Research output: Contribution to journalArticlepeer-review

172 Scopus citations


We report on the fabrication of 280-nm AlGaN-based deep-ultraviolet light-emitting diodes (UV LEDs) on sapphire substrates with an integrated microlens array. Microlenses with a diameter of 12 μm were fabricated on the sapphire substrate by resist thermal reflow and plasma dry etching. LED devices were flip-chip bonded on high thermal conductive AlN ceramic submounts to improve the thermal dissipation, and the emitted UV light was extracted through the sapphire substrates. With the integrated microlens array, a 55% enhancement in the output power at 20-mA dc driving was achieved compared with the same LED without microlens. The light extraction enhancement is the result of the reduced internal reflections of the light caused by the microlens surface profile.

Original languageEnglish (US)
Article number173504
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number17
StatePublished - Apr 25 2005
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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