Fig. 2: Observed temperature dependence of photoluminescence from multiple Stark–Stark transitions of Er3+ in Er2O3.
From: Phonon-mediated temperature dependence of Er3+ optical transitions in Er2O3
a Er3+ level diagram showing the splitting of 4S3/22,H11/24,I13/2 and 4I15/2 due to the crystal field of Er2O3. Also shown are representative transitions. The transition lines are color-coded to the data shown in b and c. Normalized temperature-dependent intensity of peaks originating from several excited Stark-split levels in 4S3/2 (b) and 2H11/2 (c). Once normalized, the temperature-dependent behavior was identical for photoluminescence peaks originating from the same Stark-split level.
