Fig. 4: Electrical and optical properties of single and stack of two BD LEDs. | Nature Communications

Fig. 4: Electrical and optical properties of single and stack of two BD LEDs.

From: Bidirectional light-emitting diode as a visible light source driven by alternating current

Fig. 4

a Current-voltage and b optical power characteristics of single and stack of two BD LEDs. Optical spectra of c, d single and e, f stack of two BD LEDs under negative and positive bias measured in steps of 0.2 kAcm−2 up to ±1 kAcm−2, respectively. Insets show real color pictures showing emission at a current density of ±1 kAcm−2 obtained from devices with a size of 100 × 100 μm2.

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