Spectroscopic studies of Mn^3+ and Mn^2+ ions in YAlO_3

The spectroscopic properties of

{Mn}^{3 +}

and

{Mn}^{2 +}

ions have been studied in

Mn : {YAlO}_{3}

codoped with Ce and singly Mn-doped

{YAlO}_{3} .

{Mn}^{3 +}

absorption at the

^{5} E \to^{5} T_{2}

transition, the transition between the Jahn–Teller split components of the ground state

^{5} E,

and Fano antiresonance mixing between the

^{3} E

and

^{5} T_{2}

states have been investigated. The weak absorption at 0.41 µm was attributed to the

^{6} A_{1} \to^{4} A_{1},^{4} E

transition of

{Mn}^{2 +} .

Green emission peaking at 530 nm excited with x rays was attributed to the

^{4} T_{1} \to^{6} A_{1}

transition of

{Mn}^{2 +} .

The reduction of

{Mn}^{2 +}

concentration in photoexposed samples may imply the presence of

{Mn}^{+}

ions in

{YAlO}_{3} .