. 2019 Dec 13;9:19031. doi: 10.1038/s41598-019-55246-z

Table 1.

The various centres in Er doped Si identified by EPR, PL and Zeeman measurements.

Centre label	Experimental method	Symmetry	Coordination	Ref.
OEr-1, OEr1′, OEr-3	EPR	Monoclinic C_1h	O	^8–10
OEr-2, OEr-2′, OEr-4	EPR	Trigonal C_3v	O	^7–10
Er-1	Zeeman	Orthorhombic C_2v	O, Si	^5,6
Er-C	PL	Cubic	Si	^4,11
Er-O1, Er-O2	PL	Low	O	⁴