cathodoluminescence

/K AE1 TH OW0 D AH0 L UW0 M AH0 N EH1 S AH0 N S/
noun
  1. 1

    A form of luminescence produced by the bombardment of a metal or a phosphor by electrons (as in a traditional television).

Source: https://en.wiktionary.org/wiki/cathodoluminescence