The nonradiative transition costs follow the method WNR = W (0) exp(-alphap), where p is the quantity of phonons matching the energy gap. The nonradiative changeover fees of Er3+ exhibit temperature dependence in keeping with the multiphonon relaxation concept. In Tm3+ the temperature dependence of nonradiative leisure fees is difficult https://fe-zns-crystal41738.blogsidea.com/39683154/not-known-details-about-er-yb-yab-crystal