The nonradiative transition costs follow the formula WNR = W (0) exp(-alphap), where p is the amount of phonons matching the Power gap. The nonradiative transition premiums of Er3+ exhibit temperature dependence in keeping with the multiphonon relaxation concept. In Tm3+ the temperature dependence of nonradiative leisure rates is challenging https://er-yb-yab-crystal30627.webdesign96.com/33654771/5-simple-techniques-for-er-yb-yab-crystal