Abstract
Intense blue persistent luminescence (PersL) with sufficiently long duration time was firstly observed in SiO2 particles after calcination with carbon. In indicates that the intense PersL of the optimal SiO2 sample calcinated with carbon (1:2) at 600°C can be recorded for about 1h (0.32mcd/m2) and is actually visible for even more than 3h by the dark-adapted vision in darkness. It reveals that the defects formatted during the calcination with carbon should be associated with oxygen vacancies and they play very important roles as emitters and traps, contributing to the PersL. The depth of the dominant traps in the optimal SiO2 sample is calculated to be about 0.71eV, which is in a suitable range for PersL (0.5–0.8eV).
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