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Outstanding optical temperature sensitivity and dual‐mode temperature‐dependent photoluminescence in Ho 3+ ‐doped (K,Na)NbO 3 –SrTiO 3 transparent ceramics
Author(s) -
Lin Jinfeng,
Lu Qiling,
Xu Jie,
Wu Xiao,
Lin Cong,
Lin Tengfei,
Chen Chao,
Luo Laihui
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16336
Subject(s) - materials science , photoluminescence , transparent ceramics , natural bond orbital , ceramic , doping , phosphor , microstructure , transmittance , optoelectronics , analytical chemistry (journal) , mineralogy , composite material , chemistry , chromatography , density functional theory , computational chemistry
High optical temperature sensing properties based on rare‐earth‐doped (K,Na)NbO 3 ‐based ferro‐/piezoelectrics have attracted much attention due to their potential application in novel optoelectronic devices. Here, we fabricated Ho 3+ ‐doped (K 0.5 Na 0.5 )NbO 3 –SrTiO 3 transparent ceramics by conventional pressureless sintering. Their microstructures, transmittances, up‐conversion photoluminescence, and optical temperature sensing properties have been characterized in details. Because of the cubic‐like phase, dense, and fine‐grained structure as well as relaxor‐like feature, the ceramics exhibit high transmittance (~70%) in the near‐infrared region. Owing to Ho 3+ , green and red up‐conversion emissions have been observed, which can be easily modulated by temperature. The ceramics have stable emission colors (<200°C) and superior temperature‐modulating emission color‐tunable performance (>200°C). Furthermore, the temperature sensing behavior based on the thermally coupled levels ( 5 F 4 , 5 S 2 ) of Ho 3+ has been analyzed by a fluorescence intensity ratio technique. The transparent ceramics possess outstanding optical temperature sensitivity (~0.0096/K at 550 K), higher than most rare‐earth‐doped materials (e.g., ceramics, glasses, and phosphors).