Crystal growth, upconversion, and infrared emission properties of Er3+-doped KPb2Br5

The optical properties of Er3+ doped NaY(MoO4)2 crystal for laser applications around 1.5μm

“…The measured radiative lifetime of the 4 H 13/2 → 4 H 15/2 transition was significantly longer compared with the calculated lifetime, which could be due to radiation trapping in the first excited state of Er 3+ [19].…”

Growth and optical characteristics of Er3+:LiLa(MoO4)2 crystal

“…The fluorescence lifetime of the 4 I 13/2 → 4 I 15/2 transition of Er 3+ in LiLa(MoO 4 ) 2 crystal at room temperature was measured to be 7.20 ms, which is longer than the radiative lifetime (4.88 ms). This phenomenon has also existed in some other Er 3+ -doped hosts such as Er 3+ :NaGd(WO 4 ) 2 [9], Er 3+ :NaY(MoO 4 ) 2 [12], Er 3+ :LiNbO 3 [24], Er 3+ :SrWO 4 [25], Er 3+ :KPb 2 Cl 5 [26], and Er 3+ :KPb 2 Br 5 [27]. This may be resulted from excitation trapping and emission reabsorption [15,28,29].…”

Downconversion for solar cells in NaYF4:Er,Yb

“…The energy difference between the 4 F 7/2 level and the 2 H 11/2 level is typically around 1300 cm −1 . [19][20][21] The maximum phonon energy in the NaYF 4 lattice is some 400 cm −1 which means that the energy gap can be bridged by ϳ3 phonons. Based on the energy gap law and experimental results a rule of thumb predicts that radiative decay and multiphonon relaxation can compete when the gap is five times the phonon energy.…”