The mpd behaviour of the crcitatian lineshape of the '&(I) level of YAG:@+ for three different fonsenmtions of P?+ (0.08.0.24 and 0.6 at.90) is investigated The satellite line smffllre in the vicinity of the main inhomagenearsly bmadened tansition is related to ions in different cytal-field sites. Studies of the selectively excited decay w e s of the '& luminescence reveal an almost exponential decay only for the 0.08 at% sample after excitation of the absorption line centre. A non-exponential decay from the 0.24 and 0.6 at.% n y s t a l s is interpreted in terms of direct donor-accep(or energy transfer by cross relaxation. The technique of fluorescence line narrowing is used to analyse the effect of phonon-assisted spear4 diffusion AntiStokes emission from the 'Po level following excitaoon of the 'D2 state is studied as a function of P?+ concentration. It is concluded that the antiStokes fluorescence in the diluted YAG:O.O~ aL% P?+ rptem resulk fmm thc excited-state absorption process while in YAG:0.6 at.% P?+ this antiStolies emission is atrributed to upccnversioo by energy d e r .
The emission properties of the 3
P0
state of praseodymium ions in lithium niobate crystal have been studied. Blue-green emission at 510 nm corresponding to the 3
P0
3
H4
transition in Pr3+
:LiNbO3
crystals was generated after direct and up-conversion excitation with orange and infrared radiation around 920 nm. The up-conversion mechanisms were shown to be energy transfer and excited state absorption for orange and infrared excitation, respectively. The processes responsible for non-radiative relaxation of the 3
P0
state were also determined.
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