Table 2 Quenching temperature T_½ (K) and ⁴A₂ → ⁴T₂ energy (cm⁻¹) for Mn⁴⁺-doped oxide materials

Host lattice	⁴A₂ → ⁴T₂ energy (cm⁻¹)	T_½ (K)	References
Mg₄GeO₆	23,697	730	55
Mg₂₈Ge_7.5O₃₈F₁₀	23,923	700	26,55,56
K₂Ge₄O₉	21,739	373	62
K₂Ge₄O₉ (site 1)	19,231	160	63
K₂Ge4O₉ (site 2)	21,700	379	63
Rb₂Ge₄O₉ (site 1)	19,231	162	63
Rb₂Ge₄O₉ (site 2)	20,850	346	63
Y₂Mg₃Ge₃O₁₂	23,753	850	64
La₃GaGe₅O₁₆	21,413	420	65
La₂ZnTiO₆	19,608	230	66
La₂MgTiO₆	20,000	250	66
CaZrO₃	18,500	300	25,26
Mg₆As₂O₁₁	23,810	680	57
Y₃Al₅O₁₂	20,619	300	67
Y₃Al₅O₁₂	20,833	300	68
Sr₄Al₁₄O₂₅	22,222	423	69
SrLaAlO₄	19,231	300	53
LiGa₅O₈	20,000	350	70

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