TABLE 3.

Solid-state lifetimes of Ln^III centers at multiple temperatures from the [Ln₂Ln’] complex series, averaged across variable excitation wavelengths ([Yb₂Tb] = orange, [Eu₂Tb] = green, [Yb₂Eu] = blue). Both Eu^III and Tb^III values are calculated average lifetimes from a bi-exponential fit.

Lifetime		YbIII τ (µs)		TbIII τavg (ms)		EuIII τavg (ms)
Complex		$\left[{\mathrm{Yb}}_2\mathrm{Tb}\right]$	$\left[{\mathrm{Yb}}_2\mathrm{Eu}\right]$	$\left[{\mathrm{Yb}}_2\mathrm{Tb}\right]$	$\left[{\mathrm{Eu}}_2\mathrm{Tb}\right]$	$\left[{\mathrm{Eu}}_2\mathrm{Tb}\right]$	$\left[{\mathrm{Yb}}_2\mathrm{Eu}\right]$
Temperature (K)	298	8.1	9.1	0.56	0.23	0.15	0.60
	150	8.4	9.7	0.57	0.35	0.21	0.65
	77	8.7	10	0.56	0.34	0.23	0.66
	20	9.2	11	0.51	0.38	0.24	0.62
Global τ		8.6 ± 0.4	9.8 ± 0.6	0.55 ± 0.03	0.33 ± 0.06	0.21 ± 0.02	0.63 ± 0.09