A Comparative Study of Er³⁺, Er³⁺-Eu³⁺, Er³⁺-Tb³⁺, and Er³⁺-Eu³⁺-Tb³⁺ Codoped Y₂O₃ Nanoparticles as Optical Heaters

Table 1

Parameters and linear fit of (2) for all Y₂O₃ samples.

Sample	(cm^−1)	Linear fit
Y2O3:Er^3+	825.58	= 2.80 + (−1187.89)/
Y2O3:Er^3+-Eu^3+-Tb^3+	826.24	= 2.79 + (−1188.84)/
Y2O3:Er^3+-Tb^3+	801.77	= 2.57 + (−1153.63)/
Y2O3:Er^3+-Eu^3+	737.62	= 2.46 + (−1061.33)/