The nonradiative transition rates Keep to the formula WNR = W (0) exp(-alphap), where by p is the number of phonons matching the Power gap. The nonradiative transition prices of Er3+ show temperature dependence per the multiphonon relaxation idea. In Tm3+ the temperature dependence of nonradiative peace prices is complicated https://er-yb-yab-crystal49405.blog-ezine.com/33222613/not-known-details-about-er-yb-yab-crystal