The nonradiative changeover premiums Adhere to the formulation WNR = W (0) exp(-alphap), where by p is the volume of phonons matching the energy gap. The nonradiative changeover rates of Er3+ exhibit temperature dependence per the multiphonon relaxation concept. In Tm3+ the temperature dependence of nonradiative relaxation charges is difficult https://jareddfdbx.suomiblog.com/what-does-er-yb-yab-crystal-mean-48693492