A study of the phosphorescence mechanism of polycrystalline diamond films

A study of the phosphorescence mechanisms in polycrystalline diamond films was carried out through their thermoluminescent (TL) vanishing glow respons e. The polycrystalline diamond films phosphoresced when kept at room or hig her temperatures after bei ng excited with a UV light source. The observed behaviour of shallow and deep traps during the phosphorescence process can be explained with a simple time-dependent model. The diamond film phosphore scence was induced by exciting with a UV light source of 4W and 254 nm wave length. The TL vanishing glow curves were integrated from room temperature to 350 degrees C at a linear heating rate of 10 degrees C s(-1) in a N-2 at mosphere. The optical response of the diamond films was studied by means of its luminescence spectra, showing a broad emission band centered around 50 0 nm.