首页|Spectroscopic and temperature sensing properties of Sm3+in self-activated CsLu(WO4)2 phosphors
Spectroscopic and temperature sensing properties of Sm3+in self-activated CsLu(WO4)2 phosphors
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In this research,a series of Sm3+doped CsLu(WO4)2 phosphors was prepared via high temperature solid phase technique to design new red phosphors and optical thermometric materials.Their structures,morphology,band gap and luminescence properties were characterized by X-ray diffraction,scanning electron microscopy,diffuse reflection and luminescence spectra,respectively.Under UV excitation,CsLu(WO4)2 gives rise to a blue broad emission band between 350 and 700 nm,which stems from the 3T1u→ 1A1g transition of WO66-groups.When Sm3+is introduced into CsLu(WO4)2,energy transfer between WO66-groups and Sm3+ions takes place in CsLu(WO4)2∶Sm3+phosphors,and color-tunable luminescence from blue to red is realized by controlling the Sm3+doping concentration.The energy transfer efficiency between WO66-groups and Sm3+ions was analyzed,and the energy transfer mechanism was determined to be dipole-dipole interactions.According to the temperature-dependent luminescence spectra,WO66-groups and Sm3+ions exhibit large discrepancy in thermal quenching rates,and thus the temperature sensing properties of CsLu(WO4)2∶Sm3+in the temperature range of 283-403 K were analyzed.Based on the framework of fluorescence intensity ratio theory,the basic optical thermometry parameters including absolute and relative sensitivity of CsLu(WO4)2∶Sm3+were calculated and the results show that it has great potential for application in optical thermometry.
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