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Abstract
AbstractOptical and electrical properties of 1%Er3+ and different Yb3+ content (1ExY) codoped Ba0.8Sr0.2TiO3 (BST) ferroelectric ceramics fabricated by the solid‐phase reaction were investigated. Under 980 nm pump condition, two green emission bands at 525 and 549 nm wavelength corresponding to, 2H11/2→4I15/2 and 2S3/2→4I15/2 transitions, and two red emission bands at 655 and 668 nm wavelength attributed to 4F9/2→4I15/2 transition are observed. The temperature‐sensing behaviors, calculated by the intensity ratio I525/I549 suggested that, the maximum sensitivity of the green emission of the 1E8Y‐BST ceramics is 1.07×10−2 K‐1 at 293 K. Furthermore, the maximum sensitivity of 1E6Y‐BST and 1E11Y‐BST ceramics were obtained around the Curie temperature. The fluorescence lifetime of 1E8Y‐BST ceramics for 2H11/2 level and 2S3/2 level shortened with the increase in the temperatures. Moreover, the upconversion (UC) luminescence intensity of 1E8Y‐BST decreased with the increase in the external electric field and had a mutation at the coercive electric field (Ec) of about 1.24 kV/cm, which revealed that the electric field had influence on the UC luminescence.
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