Enhanced Emission of Deep Ultraviolet Light-Emitting Diodes through Using Work Function Tunable Cu Nanowires as the Top Transparent Electrode

The Journal of Physical Chemistry Letters
Zongxing HuangJunyong Kang

Abstract

Deep ultraviolet light-emitting diodes (DUV LEDs) (<280 nm) have been important light sources for broad applications in, e.g., sterilization, purification, and high-density storage. However, the lack of excellent transparent electrodes in the DUV region remains a challenging issue. Here, we demonstrate an architectural engineering scheme to flexibly tune the work function of Cu@shell nanowires (NWs) as top transparent electrodes in DUV LEDs. By fast encapsulation of shell metals on Cu NWs and a shift of electron binding energy, the electronic work function could be widely tailored down to 4.37 eV and up to 5.73 eV. It is revealed that the high work function of Cu@Ni and Cu@Pt NWs could overcome the interfacial barrier to p-AlGaN and achieve direct ohmic contact with high transparency (91%) in 200-400 nm. Completely transparent DUV LED chips are fabricated and successfully lighted with sharp top emission (wall-plug efficiency reaches 3%) under a turn-on voltage of 6.4 V. This architectural strategy is of importance in providing highly transparent ohmic electrodes for optoelectronic devices in broad wavelength regions.

References

Jun 22, 2010·Nature Nanotechnology·Sukang BaeSumio Iijima
Jan 15, 2011·Nanotechnology·David S HechtSteven Risser
Aug 1, 2013·Scientific Reports·Huizhang GuoDong-Liang Peng
Sep 25, 2014·Advanced Materials·Shengrong YeBenjamin J Wiley
Sep 30, 2016·ACS Applied Materials & Interfaces·Huachun WangDuanjun Cai
May 5, 2017·Nano Letters·David Arto LaleyanZetian Mi
Dec 17, 2017·Optics Express·Ray-Hua HrongWei-Hung Kuo

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Citations

Jun 22, 2021·Light, Science & Applications·Jinchai LiJunyong Kang

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