Physics of holiday lights

• Jennifer J. Birriel ^[1]
  1. [1] Morehead State University

     Morehead State University

     Estados Unidos

     
• Localización: The Physics Teacher, ISSN 0031-921X, Vol. 62, Nº. 2, 2024, págs. 152-152
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • While “goofing” around with my 365-nm LED flashlight, I happened to accidentally light upon my Christmas tree LED light strand. The incident UV light caused the core of the bulb to glow a bright whitish color, as seen in Fig. 1. Why should that be? It turns out that many “white” LEDs are produced by using a blue LED bulb coated with a yellow phosphor, which produces white light by phosphorescence.1