Why was it so difficult to make the blue LED when red and green had already existed since the 196...
2:27
YouTubeAngelo Rizzo ticonsiglia
Why was it so difficult to make the blue LED when red and green had already existed since the 196...
Perché ci sono voluti 30 anni per inventare un LED blu, se il rosso e il verde esistevano già dagli anni Sessanta? Perché il blu non è solo un colore diverso. È un problema di fisica completamente diverso. Partiamo dall'inizio. Un LED emette luce quando un elettrone cade da un livello energetico alto a uno basso, rilasciando quell'energia ...
8.4K views2 weeks ago
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