The nonradiative transition costs Keep to the formula WNR = W (0) exp(-alphap), wherever p is the amount of phonons matching the energy gap. The nonradiative changeover prices of Er3+ show temperature dependence consistent with the multiphonon relaxation idea. In Tm3+ the temperature dependence of nonradiative relaxation prices is difficult https://augustlmkhc.ageeksblog.com/32226752/the-basic-principles-of-er-yb-yab-crystal