High pressure spectroscopy of Pr3+ in LiNbO3

Impurity-trapped excitons: Experimental evidence and theoretical concept

“…The energetic pressure shift of the trapped exciton state has been estimated to exceed 25 cm À1 /kbar [15]. The same effect has been obtained for LiTaO 3 :Pr 3+ [28], but in this case the trapped exciton state's initial energy is higher and has no influence on Fig. 3(a)).…”

“…The influence of the energy of trapped exciton states on the luminescence and luminescence kinetics of Pr 3+ ions has motivated us to study the Pr 3+ emission in LiTaO 3 :Pr 3+ [28] and LiNbO 3 : Pr 3+ [20] under high hydrostatic pressure. Selected luminescence spectra are presented in Figs.…”

High pressure photoluminescence study of Pr 3+ doped LiNbO 3 crystal

“…Details of crystals growing, samples preparation and experimental setup are described in our previous paper [12]. Typical emission spectra of the above 78 kbar, apart of the sharp lines the broad band emission appears.…”

“…It is is smaller than unity. Analysis of the excitation spectra presented in paper [12] yields that energy eff ∆ at ambient pressure is between 3000 cm -1 and 6000 cm -1…”

“…High pressure spectroscopy, with pressure applied in diamond anvil cells has been considered as an effective tool for investigation of the energetic structure and crystal filed splitting of transition metal and rare earth ions in solids [14]. The first approach to the high pressure spectroscopy of LiNbO 3 :Pr 3+ has been done in our previous paper [12], where we have focus on analysis of pressure induced changes of structure of the sharp lines emission related to 1 D 2 → 3 H 4 transitions. This contribution is devoted to influence of pressure on broad band emission and energy of trapped exciton.…”