Table 5. Parameters of Fits Obtained from the Temperature Dependence of the PL Decay Time (Equation 5) for Mn⁴⁺ Emission in (Al_1–xGa_x)₂O₃.

sample composition (x value)	τ1, ms	τ2, ms	Ep, meV	D,a meV	τ3, μs	ΔE1, meV	τ4, ms	ΔE2, meV
0	0.78 ± 0.02	1.13 ± 0.02	56.7 ± 1	10.0	0.1	225 ± 21	5 × 10–13	929 ± 46
0.05	0.74 ± 0.02	1.09 ± 0.02	54.4 ± 1	10.0	0.1	289 ± 20	2 × 10–11	784 ± 42
0.1	0.64 ± 0.02	0.80 ± 0.02	52.9 ± 2	10.0	0.1	189 ± 15	6 × 10–9	554 ± 15
0.15	0.64 ± 0.02	0.83 ± 0.02	56.9 ± 2	10.0	0.1	137 ± 5	2 × 10–9	557 ± 19
0.2	1.15 ± 0.01	1.24 ± 0.02	55.3 ± 2	2	0.7	32 ± 1	2 × 10–5	238 ± 5
0.25	0.98 ± 0.01	1.04 ± 0.02	50.9 ± 3	2	0.6	34 ± 1	2 × 10–5	245 ± 9
0.5	0.74 ± 0.01	0.79 ± 0.01	38.6 ± 3	2	0.57	35 ± 1	1 × 10–5	180 ± 20
0.75	0.56 ± 0.01	0.57 ± 0.01	35.0 ± 4	2	0.35	25 ± 2	4 × 10–4	124 ± 7
1.0	0.74 ± 0.01		27.1 ± 1			10 ± 4	1 × 10–8	178 ± 27

^aThe value of D is fixed to be equal to the energy splitting of the ²E level (as per the spectroscopic data).