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We report on the UV laser-induced fluorescence of hexagonal boron nitride (h-BN) following nanosecond laser irradiation under vacuum and in different environments of nitrogen gas and ambient air. The observed fluorescence bands are tentatively ascribed to impurity and mono (V N ) or multiple (m-V N with m=2 or 3) nitrogen vacancies. A structured fluorescence band between 300 and 350nm...
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