Baochen Wang,Shifeng Sun,Zeqi Li,Zongwang Li,Weiwei Lin,Chao Zeng,Yan-gai Liu,Ruiyu Mi
Rare earth co-doped phosphor for fluorescence intensity ratio (FIR) thermometer has gained increasing attention in recent years. Herein, the novel Tb 3+ and Eu 3+ co-doped K 3 SrBi(P 2 O 7 ) 2 (KSBP) phosphate phosphors were reported. The crystal structure of the title phosphor was determined using Rietveld refinement and proved to have a three-dimensional structure. The time-resolved spectroscopy reveals that there is almost no energy transfer between Tb 3+ and Eu 3+ . More importantly, Tb 3+ and Eu 3+ emissions show different thermal quenching behaviors, which claims the potential of this material for application in optical thermometer. The FIR of the typical KSBP:0.02Tb3+,0.04Eu3+ sample demonstrates a polynomial relationship as a function of temperature and the absolute and relative sensitivity are 0.025 K –1 and 0.59%/K, respectively. In general, our study reports a novel and potential KSBP:Tb 3+ ,Eu 3+ phosphate phosphor that is promising for use in high-sensitive FIR thermometers.
Ultraviolet nonlinear optical (UV NLO) crystals are the key and basic materials for solid-state lasers. Phosphates as UV NLO crystals are limited in practical applications due to their weak second-harmonic generation (SHG) response. In this work, two non-centrosymmetric pyro-phosphates of K3SrBi(P2O7)2 and Rb3SrBi(P2O7)2 have been synthesized by a high-temperature solution method. Systematic property measurements show that they both have short UV cut-off edges (∼240 nm) and large SHG responses (4 × KDP for K3SrBi(P2O7)2 and 2.1 × KDP for Rb3SrBi(P2O7)2). Thus, they are both promising UV NLO candidates. In particular, K3SrBi(P2O7)2 shows the strongest SHG response in the family of A3BBi(P2O7)2 (A = K, Rb, B = Sr; A = Rb, Cs, B = Ba, Pb), which is about twice higher than that of isomorphic Rb3SrBi(P2O7)2. The study of the structure–property relationship shows that the synergistic effect of P2O7 dimers and BiO6 polyhedra is the main contribution to their excellent NLO properties. And better orientations of P2O7 dimers and larger distortion of BiO6 units play important roles in enhancing the SHG response of K3SrBi(P2O7)2.
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