The nonradiative changeover costs follow the system WNR = W (0) exp(-alphap), in which p is the volume of phonons matching the Power gap. The nonradiative changeover rates of Er3+ exhibit temperature dependence according to the multiphonon relaxation concept. In Tm3+ the temperature dependence of nonradiative leisure costs is complex https://erybyabcrystal84172.bloginwi.com/66979182/helping-the-others-realize-the-advantages-of-er-yb-yab-crystal