The nonradiative transition charges Keep to the method WNR = W (0) exp(-alphap), wherever p is the number of phonons matching the Power gap. The nonradiative transition premiums of Er3+ show temperature dependence per the multiphonon leisure principle. In Tm3+ the temperature dependence of nonradiative leisure costs is complex via https://erybyabcrystal93728.amoblog.com/5-simple-statements-about-er-yb-yab-crystal-explained-55102879