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Tailoring optical temperature sensing performance of K7MgSc2B15O30:Mn2+ via structure modulation

Ruoyu Fu,Ying Fu,Feng Zhang,Liuhan Yi,Chao Li,Mengzhu Long

Due to its relatively low cost and remote detection characteristics, optical temperature sensing technology based on FIR has received widespread attention. At present, there is a lack of theoretical guidance on how to purposefully improve or guide the development of high-performance temperature sensing materials. Herein, the structure of a novel material K 7 MgSc 2 B 15 O 30 has been confirmed by the XRD analysis. Furthermore, the effect of Zn on the crystal structure and the photoluminescence (PL) properties of K 7 MgSc 2 B 15 O 30 :Mn 2+ has been studied. The PL spectra analysis of a series of Mn 2+ doped K 7 MgSc 2 B 15 O 30 luminescence materials indicates that two kinds of Mn 2+ emitting centers (Mn(1) and Mn(2)) exist due to the two possible substitution sites Mg 2+ and Sc 3+ . With the increasing of Zn 2+ , the intensity ratio of Mn(2) to Mn(1) improves from 1.01 to 1.88 at room temperature. Especially, the thermal stability of Mn(1) and Mn(2) gradually decrease with the increasing of Zn 2+ contents, which can be due to the lengthening of Zn/Mg–O bonds and the lattice distortion of ScO 6 , respectively. Finally, their temperature sensing sensitivity has been enhanced by the doping of Zn 2+ , which has a close relation to the different effect of the thermal stability of Mn(1) and Mn(2). This work is expected to provide new ideas for the development of high-performance temperature sensing materials based on FIR, and is helpful to understand the relationship between the crystal structure and luminescence properties.