The nonradiative changeover premiums follow the components WNR = W (0) exp(-alphap), wherever p is the number of phonons matching the Electricity hole. The nonradiative transition costs of Er3+ show temperature dependence in step with the multiphonon leisure principle. In Tm3+ the temperature dependence of nonradiative peace premiums is complex https://er-yb-yab-crystal69013.theideasblog.com/35309825/details-fiction-and-er-yb-yab-crystal