The nonradiative changeover charges Keep to the method WNR = W (0) exp(-alphap), exactly where p is the volume of phonons matching the energy gap. The nonradiative changeover fees of Er3+ show temperature dependence per the multiphonon relaxation concept. In Tm3+ the temperature dependence of nonradiative leisure fees is difficult https://erybyabcrystal06305.qodsblog.com/33137926/considerations-to-know-about-er-yb-yab-crystal