The nonradiative changeover rates Stick to the formula WNR = W (0) exp(-alphap), wherever p is the amount of phonons matching the energy hole. The nonradiative transition charges of Er3+ show temperature dependence consistent with the multiphonon relaxation idea. In Tm3+ the temperature dependence of nonradiative leisure rates is difficult https://erybyabcrystal60504.mpeblog.com/58123861/er-yb-yab-crystal-an-overview