Abstract

The spectroscopic properties of ${\mathrm{Mn}}^{3+}$ and ${\mathrm{Mn}}^{2+}$ ions have been studied in $\mathrm{Mn}:{\mathrm{YAlO}}_3$ codoped with Ce and singly Mn-doped ${\mathrm{YAlO}}_3.$ ${\mathrm{Mn}}^{3+}$ 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 ${\mathrm{Mn}}^{2+}.$ Green emission peaking at 530 nm excited with x rays was attributed to the ${ }^4{T}_1{\to }^6{A}_1$ transition of ${\mathrm{Mn}}^{2+}.$ The reduction of ${\mathrm{Mn}}^{2+}$ concentration in photoexposed samples may imply the presence of ${\mathrm{Mn}}^{+}$ ions in ${\mathrm{YAlO}}_3.$

© 1999 Optical Society of America

Spectroscopic studies of Mn⁴⁺ ions in yttrium orthoaluminate

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