Modern device technology reveals increasing interest to materials with integrated functional possibilities. The potassium titanyl phosphate KTiOPO4 (KTP), for example, is a perspective material for similar application. Thus, it is possible to use nonlinear optical properties of the doped KTP crystal for light generation and as nonlinear material at the same device.
This paper presents results of spectral-luminescent investigation of the phosphate crystals doped with the RE ion impurities. The crystals were synthesized from melt of mixtures of the corresponded oxides taken in optimal proportions. Choice of activated ions was caused not only by the fact that RE ions are the main "laser" activator impurities. It was also taken into account that RE impurities stabilize the crystals structure.
Investigation of the spectral-kinetic (absorption, luminescence) properties of pure (inactivated) and doped single crystals and polycrystalline samples of the potassium titanyl phosphate KTP:RE3+ (RE = La, Eu, Nd) and sodium titanium phosphate NaTi2(PO4)3 (RE = Sm, Dy) was carried out in 4,2 - 300 K temperature region. Luminescence bands and decay kinetic of matrix emission and of inner emission of the RE ions were observed. It was shown on an example of the impurity europium ions (Eu3+) that RE ions can arrange two different positions in the phosphate matrices. This is explained by unisocharged arrangement of the rare earth ions on the sites of titanium ions with 4+ charge.