Fig. 1. (a) Schematics of the C-DUV LED and (b) the TJC-DUV LED.

Fig. 2. (a) LOPs as functions of the injection currents for the C-DUV LEDs with five QWs, 10 QWs, and the TJC-DUV LED, respectively. (b) The EL spectra of the three DUV LEDs. (c) The LOPs and IQEs as functions of the number of the QWs in the C-DUV LED at 60 mA. (d) The current-voltage characteristics of the three investigated samples.

Fig. 3. (a) Required input power of the C-DUV LEDs with five QWs, 10 QWs, and TJC-DUV LED, respectively, as a function of output power. (b) The corresponding WPE values of the three devices as functions of current.

Fig. 4. Energy band diagram for the TJC-DUV LED at 60 mA.

Fig. 5. e–h concentrations within active regions for (a1) the C-DUV LED with five QWs, (b1) the C-DUV LED with 10 QWs, and (c1) the TJC-DUV LED, respectively. The radiative recombination rates within the active regions for (a2) the C-DUV LED with five QWs, (b2) the C-DUV LED with 10 QWs, and (c2) the TJC-DUV LED. The non-radiative recombination rates within the active regions at 60 mA for (d) the C-DUV LED and (e) the TJC-DUV LED. (f) The IQE values of the two devices as functions of current.