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Quantum emitters in hexagonal boron nitride (hBN) have recently emerged aspromising bright single photon sources. In this letter we investigate indetails their optical properties at cryogenic temperatures. In particular, weperform temperature resolved photoluminescence studies and measure photoncoherence times from the hBN emitters. The obtained value of 81(1) pstranslates to a width of $\sim$12 GHz which is higher than the Fouriertransform limited value of $\sim$32 MHz. To account for the photodynamics ofthe emitter, we perform ultrafast spectral diffusion measurements thatpartially account for the coherence times. Our results provide importantinsight into the relaxation processes in quantum emitters in hBN which ismandatory to evaluate their applicability for quantum information processing.

Photodynamics of quantum emitters in hexagonal boron nitride revealed by low temperature spectroscopy