Check it out:

Physicists in Japan have made a diode that emits light at the shortest wavelength ever. The device, made by Yoshitaka Taniyasu and colleagues at NTT Basic Research Laboratories in Atsugi, is made from aluminium nitride and emits deep in the ultraviolet part of the spectrum at 210 nanometres (Nature 441 325).

Finally, I get LED-lined clothes that tan me as I wear them.