Garnet-structured Li6CaLa2Nb2O12:Yb/Er new phosphor showing superior performance of optical thermometry. (August 2020)

• Record Type: Journal Article
• Authors: Du, Panpan; Sun, Xudong; Zhu, Qi; Li, Ji-Guang
• Is Part Of: Scripta materialia. Number 185(2020)
• Page Start: 140
• Page End: 145
• Publication Date: 2020-08
• Subjects: Li-garnet -- Upconversion luminescence -- Optical thermometry; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.04.039
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: A series of garnet-structured Li6 Ca(La0.99- x Yb x Er0.01 )2 Nb2 O12 (0≤ x ≤0.05) phosphors were originally synthesized and examined for upconversion (UC) luminescence and optical temperature sensing under 978 nm laser excitation. It was identified that the optimal content of Yb 3+ sensitizer is x =0.04 for Er 3+ emission and the non-thermally coupled 2 H11/2 / 4 F9/2 energy levels of Er 3+ possess a superior capability of optical thermometry, whose maximum absolute sensitivity (~15.20 × 10 −3 K −1 at 523 K) is generally ~1.7-6.1 times the values reported to date for most of other UC systems. Graphical Abstract: The optimal Yb 3+ content of Li6 Ca(La0.99- x Yb x Er0.01 )2 Nb2 O12 is x =0.04 for Er 3+ emission and the non-thermally coupled 2 H11/2 / 4 F9/2 Er 3+ levels were identified to be superior for optical thermometry, whose maximum absolute sensitivity is generally ~1.7-6.1 times those reported for most of other Yb 3+ /Er 3+ codoped systems. Image, graphical abstract