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Most single photon emitters in hexagonal boron nitride has been identified ascarbon-based defects. These defects, when forming a donor-acceptor pair havespin $S\leq \frac{1}{2}$. By means of density functional calculations, we showthat two non-adjacent carbon substitutional defects of the same type (i.e.C$_\mathrm{B}$-C$_\mathrm{B}$, and C$_\mathrm{N}$-C$_\mathrm{N}$), can have atriplet ground state. In particular, one of such defects has a zero phonon lineenergy of 2.5 eV, and its triplet state is nearly 0.5 eV more stable than itssinglet.

Carbon-based single photon emitters in hexagonal boron nitride with triplet ground state