Physicist whose discovery that matter had wave properties (wave-particle duality) was crucial to quantum physics and led to him winning the Nobel Prize in Physics in 1929. In 1942, he became the secretary of the Academie des sciences, a centuries-old French scientific society.
During World War I, he worked on developing radio communication for the army.
In 1961 he received the title of Knight of the Grand Cross in the Légion d'honneur.
He had an older brother, Maurice de Broglie.
He based his theory of electron waves off of Albert Einstein's work on light.