Vol. 49, Issue 1, pp. 125-133

Vol. 49 Issue 1 pp. 125-133

Current-voltage characteristic and electroluminescence of UV LEDs 365 nm at liquid nitrogen temperature

Vitaly Veleschuk, Alexander Vlasenko, Zoya Vlasenko, Ihor Petrenko, Yevhen Malyi, Vladimir Borshch, Olena Borshch, Alexander Shefer

Keywords

S-shaped current-voltage characteristic, UV LED

Abstract

For InGaN/AlGaN/GaN ultraviolet (λ = 365 nm) light emitting diodes, the S-shaped current-voltage characteristic was observed at liquid nitrogen temperature due to the transition from single injection (electrons) to double (electrons and holes) injection. Initially only electron injection into the active region takes place and as the current is increased, the injection of holes starts. It has been found that at the voltage of the minimum of the negative differential resistance region, oscillations of the current, accompanied by increasing electroluminescence intensity arise, and the repetition rate of the oscillations increases with the direct current rise. The intensity of the main ultraviolet and yellow electroluminescence bands sharply increases with increasing current at negative differential resistance region due to the rise of holes injection.

Vol. 49
Issue 1
Article No: 11
pp. 125-133

0.49 MB
OPTICA APPLICATA - a quarterly of the Wrocław University of Science and Technology, Faculty of Fundamental Problems of Technology