Answer
Neutrino oscillations, the phenomenon where neutrinos change flavor as they travel, is not associated with de Broglie's work. De Broglie's contributions primarily centered around the wave-particle duality of matter, proposing that particles, such as electrons, could also exhibit wave-like behavior. His theory laid the groundwork for quantum mechanics and the understanding of wave-particle duality, distinct from the realm of neutrino oscillations.