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Samples for single-emitter spectroscopy are usually prepared by spin-coatinga dilute solution of emitters on a microscope cover slip of silicate basedglass (such as quartz). Here, we show that both borosilicate glass and quartzcontain intrinsic defect colour centres that fluoresce when excited at 532 nm.In a microscope image the defect emission is indistinguishable from spin-coatedemitters. The emission spectrum is characterised by multiple peaks, most likelydue to coupling to a silica vibration with an energy of 160-180 meV. Thedefects are single-photon emitters, do not blink, and have photoluminescencelifetimes of a few nanoseconds. Photoluminescence from such defects maypreviously have been misinterpreted as originating from single nanocrystalquantum dots.

Non-blinking single-photon emitters in silica