Color centers in diamond are very promising candidates among the possible realizations for practical singlephoton
sources because of their long-time stable emission at room temperature. The popular nitrogen-vacancy
center shows single-photon emission, but within a large, phonon-broadened spectrum (≈ 100 nm), which strongly
limits its applicability for quantum communication. By contrast, Ni-related centers exhibit narrow emission lines
at room temperature. We present investigations on single color centers consisting of Ni and Si created by ion
implantation into single crystalline IIa diamond. We use systematic variations of ion doses between 108 cm-2 and
1014 cm-2 and energies between 30 keV and 1.8MeV. The Ni-related centers show emission in the near infrared
spectral range (≈ 770 nm to 787 nm) with a small line-width (≈ 3 nm FWHM). A measurement of the intensity
correlation function proves single-photon emission. Saturation measurements yield a rather high saturation count
rate of 77.9kcounts/s. Polarization dependent measurements indicate the presence of two orthogonal dipoles.
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