Exchange broadened, optically detected ESR spectra for luminescent donor-acceptor pairs in Li doped ZnO

Abstract Application of optically detected ESR to the yellow photoluminescence of Li doped ZnO gives ESR spectra for shallow donor - lithium acceptor pairs, showing that at least a fraction of the yellow emission is donor-acceptor (D-A) luminescence. The distribution of separations rDA gives a spectrum of D-A exchange interactions J which broaden the ESR lines, particularly at high microwave power, where pairs with long excited state lifetimes, that is large rDA, are power saturated.

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