Fig. 1. (a) Top-down micrograph image representation of a micro-LED array, showing the eight concentric and individually addressable pixels. (b) UV-C pixel in operation.

Fig. 2. L-I-V curves of the devices at UV-A, UV-B, and UV-C wavelengths.

Fig. 3. EL spectra of the three devices at 10 mA.

Fig. 4. Frequency response of the UV-C μLED measured at 20 mA (black). The response at 1 MHz (indicated by the blue horizontal dotted line) is used as the low-frequency reference point to estimate the E-E −3  dB bandwidth (indicated by the red crosshair).

Fig. 5. Electrical-to-electrical bandwidth response versus current for the respective wavelengths.

Fig. 6. Spectra (red curves) of the dichroic mirrors used in the setup, and the spectra (blue data points) of the devices with each device operated at 10 mA.

Fig. 7. Schematic diagram of the optical and electrical setup used for the WDM transmission experiments.

Fig. 8. (a) Comparison of BER when filters are applied to single pixels. (b) SNR of the devices in the WDM setup. (c) BER of three devices in the WDM setup. The dashed horizontal line in (a) and (c) corresponds to a BER of 3.8×10−3.

Fig. 9. Maximum M-QAM constellation sizes achieved: (a) 32 QAM for UV-C, (b) 16-QAM for UV-B, and (c) 16-QAM for UV-A.