The nonradiative changeover charges follow the system WNR = W (0) exp(-alphap), in which p is the volume of phonons matching the Electrical power gap. The nonradiative transition costs of Er3+ show temperature dependence in line with the multiphonon peace principle. In Tm3+ the temperature dependence of nonradiative relaxation charges https://er-yb-yab-crystal41739.techionblog.com/33187355/helping-the-others-realize-the-advantages-of-er-yb-yab-crystal