The nonradiative transition rates Adhere to the formulation WNR = W (0) exp(-alphap), where p is the amount of phonons matching the Vitality hole. The nonradiative transition costs of Er3+ show temperature dependence according to the multiphonon rest principle. In Tm3+ the temperature dependence of nonradiative relaxation costs is complicated https://er-yb-yab-crystal41628.imblogs.net/82976452/5-simple-statements-about-er-yb-yab-crystal-explained