The nonradiative changeover prices follow the formula WNR = W (0) exp(-alphap), where p is the volume of phonons matching the Electricity gap. The nonradiative changeover costs of Er3+ show temperature dependence in line with the multiphonon peace concept. In Tm3+ the temperature dependence of nonradiative rest charges is difficult https://er-yb-yab-crystal51739.bloggazza.com/32151714/5-simple-statements-about-er-yb-yab-crystal-explained