On the formation of paramagnetic defects in ion-implanted fluoroaluminate glasses

Strong green and red emission of a newly developed calcium fluoroaluminate: Eu3+ phosphor

“…This is shown in Fig. [30][31][32] It seems evident therefore, that (F 2n ) − type holes detected in the ESR spectrum are the charge-compensating species of the extra positive charges that enter into the thermally grown aluminate phase as a result of substitution of some of the calcium ions by the europium ions. The strong ESR absorption lines in the field region, 135-325 mT, of the spectrum has a mean g ∼ 2.15 and four-line nuclear hyperfine structures both in its parallel and perpendicular components.…”

“…While the host material does not give any ESR signal, the heat-treated phosphor shows a signal that has a series of ESR absorption lines. [30][31][32] In the case of a hole center of multinuclear fluorine cluster, a number of hyperfine lines with a relatively smaller separation are expected in its ESR spectrum because of a mutually interacted hyperfine effect of the different fluorine nuclei (I ‫ס‬ 1/2). 5.…”