A facile approach to the synthesis of Er3+–Yb3+–Mo6+ co-doped TiO2/Yb2Ti2O7 electrospun nanofibers and high thermal sensitivity

• Published in: Journal of sol-gel science and technology Vol. 99; no. 3; pp. 557 - 564
• Main Authors: Liu, Kuichao, Ma, Ke, Tao, Hualong, Cui, Yan, Tian, Xingjian, Liu, Shimin, He, Ming, Dong, Bin, Song, Bo, Zhang, Zhihua
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.09.2021; Springer Nature B.V
• Subjects: Anatase; Annealing; Ceramics; Chemistry and Materials Science; colloids; Composites; Dimers; Electrospinning; Energy transfer; Erbium; etc.; fibers; Fluorescence; Glass; High temperature; Inorganic Chemistry; Luminous intensity; Materials Science; Morphology; Nanofibers; Nanotechnology; Natural Materials; Optical and Electronic Materials; Original Paper: Nano-structured materials (particles; Phosphors; Sensitivity; Synthesis; Titanium dioxide; Upconversion; Ytterbium; Optical temperature sensing; Mo; Up-conversion emission; Ti; Fluorescence intensity ratio; Yb; co-doped TiO; Nanofibers; Er; O
• ISSN: 0928-0707; 1573-4846
• DOI: 10.1007/s10971-021-05598-8

Er 3+ –Yb 3+ –Mo 6+ co-doped TiO 2 /Yb 2 Ti 2 O 7 up-conversion luminescent nanofibers have been successfully synthesized using the electrospinning technology followed by thermolysis. The effects of the precursor ratio and annealing process on up-conversion luminescent character were investigated. The phase of TiO 2 was determined to be either anatase or rutile. And the cubic Yb 2 Ti 2 O 7 in Er 3+ –Yb 3+ –Mo 6+ co-doped TiO 2 phosphor was confirmed. After annealing at high temperature, the up-conversion luminescent intensity of the studied system increased obviously. The fluorescence intensity ratio (FIR) used to be made on the basis of green up-conversion emissions. It was studied as a function of temperature. The maximum rate of sensitivity was ~0.01 K −1 in the range of 300–600 K. The results indicate that Er 3+ –Yb 3+ –Mo 6+ co-doped TiO 2 /Yb 2 Ti 2 O 7 phosphor is a brand-new material that meets the requirement of the optical temperature sensing. Highlights Er 3+ –Yb 3+ –Mo 6+ co-doped TiO 2 /Yb 2 Ti 2 O 7 nanofibers have been synthesized by electrospinning technique and the followed thermolysis. The morphology of nanofibers was significantly changed after annealing at high temperature. The green up-conversion emission of Er 3+ was enhanced by a high excited state energy transfer (HESET) with Yb 3+ –MoO 4 2− dimer in Er 3+ –Yb 3+ –Mo 6+ TiO 2 /Yb 2 Ti 2 O 7 nanofibers. The maximum sensitivity of Er 3+ –Yb 3+ –Mo 6+ co-doped TiO 2 /Yb 2 Ti 2 O 7 nanofibers was determined to be 0.01039 K 1 at 397 K, was better than other Er 3+ –Yb 3+ –Mo 6+ co-doped materials.