Highly Efficient Deep-UV Light-Emitting Diodes Using AlN-Based Deep-UV-Transparent Glass Electrodes

Tae Ho Lee, Byeong Ryong Lee, Kyung Rock Son, Hee Woong Shin, Tae Geun Kim

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Many studies have set out to develop electrodes that are both highly conductive and transparent across a wide spectral region, from visible to deep UV (DUV). However, few solutions have been proposed because these two properties are mutually exclusive. In this paper, an AlN-based glass electrode film with a conducting filament formed by the application of an ac pulse is proposed as a solution, which exhibits a high transmittance in the DUV region (over 95.6% at 280 nm) and a low contact resistance with a p-Al0.4Ga0.6N layer (ρc = 3.2 × 10-2 Ω·cm2). The Ohmic conduction mechanism at the interface between the AlN film and the p-Al0.4Ga0.6N layers is fully examined using various analytical tools. This AlN film is finally applied to a 280 nm top-emitting light-emitting diode, to verify the validity of the method, which exhibits very stable operations with a forward voltage of 7.7 V at 20 mA, a light output power of 7.49 mW at 100 mA, and, most importantly, a record high external quantum efficiency of 2.8% after packaging.

Original languageEnglish
Pages (from-to)43774-43781
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number50
DOIs
Publication statusPublished - 2017 Dec 20

Keywords

  • deep-UV light-emitting diode
  • direct Ohmic contact
  • glass electrode
  • pulsed electrical breakdown
  • transparent conductive electrode

ASJC Scopus subject areas

  • Materials Science(all)

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