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. 2016 Jul 8;6:29464. doi: 10.1038/srep29464

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(a) I–V curve and (b) light output power with increasing current for UV-LED having a variety of TCEs investigated in this work after one month. (b, inset) EL photographs of respective devices at 20 mA. (c) Voltage values with increasing time for UV-LEDs with three different electrodes under 20 mA continuous current injection.