The structure of oxygen-related luminescence centres in nominally undoped and Y₂O₃ doped AlN ceramics was investigated by electron paramagnetic resonance (EPR), electron nuclear double resonance (ENDOR) and optically-detected EPR. The photoluminescence-detected EPR lines having g-values of 1.990 and 2.008 were assigned to a recombination between neighbouring donor and acceptor pairs. The two EPR lines at g = 1.987 and 2.003 detected via the recombination luminescence in the afterglow are thought to be due to a recombination between the same, but distant donor and acceptor pairs. The donor was previously speculated to be an electron trapped on an oxygen impurity which substitutes for a nitrogen on a regular lattice site. The defect structure of the acceptor was established by ENDOR to be a hole trapped on an O_N–v_Al complex (O_N oxygen on a regular N site, v_Al Al vacancy). The measured superhyperfine interaction is caused by two equivalent ²⁷Al nuclei both with a = ±27.0 MHz.

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Volume219, Issue1

May 2000

Pages 171-180

Investigation of Oxygen-Related Luminescence Centres in AlN Ceramics

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