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Among a variety of layered materials used as building blocks in van der Waalsheterostructures, hexagonal boron nitride (hBN) appears as an ideal platformfor hosting optically-active defects owing to its large bandgap ($\sim 6$ eV).Here we study the optical response of a high-purity hBN crystal under greenlaser illumination. By means of photon correlation measurements, we identifyindividual defects emitting a highly photostable fluorescence under ambientconditions. A detailed analysis of the photophysical properties reveals a highquantum efficiency of the radiative transition, leading to a single photonsource with very high brightness. These results illustrate how the wide rangeof applications offered by hBN could be further extended to photonic-basedquantum information science and metrology.

Efficient single photon emission from a high-purity hexagonal boron nitride crystal