The nonradiative transition charges follow the system WNR = W (0) exp(-alphap), wherever p is the number of phonons matching the Strength gap. The nonradiative changeover prices of Er3+ exhibit temperature dependence in line with the multiphonon relaxation principle. In Tm3+ the temperature dependence of nonradiative rest charges is challenging https://erybyabcrystal18406.dailyhitblog.com/38541266/what-does-er-yb-yab-crystal-mean