The nonradiative changeover costs Keep to the system WNR = W (0) exp(-alphap), where by p is the quantity of phonons matching the Power gap. The nonradiative transition charges of Er3+ exhibit temperature dependence consistent with the multiphonon peace principle. In Tm3+ the temperature dependence of nonradiative peace premiums is https://brooksndrdo.blogocial.com/er-yb-yab-crystal-an-overview-70533095