The nonradiative transition costs follow the system WNR = W (0) exp(-alphap), where p is the number of phonons matching the Power gap. The nonradiative changeover prices of Er3+ show temperature dependence in line with the multiphonon leisure concept. In Tm3+ the temperature dependence of nonradiative relaxation prices is intricate https://erybyabcrystal97072.total-blog.com/the-smart-trick-of-er-yb-yab-crystal-that-no-one-is-discussing-58374136