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Strong Red Emissions in Pr 3+ ‐Doped (K 0.5 Na 0.5 )NbO 3 –CaTiO 3 Diphase Ceramics
Author(s) -
Sun Haiqin,
Zhang Qiwei,
Wang Xusheng,
Bulin Chaoke
Publication year - 2015
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.13362
Subject(s) - natural bond orbital , doping , analytical chemistry (journal) , materials science , photoluminescence , valence (chemistry) , atmospheric temperature range , ion , excitation , phase transition , mineralogy , chemistry , condensed matter physics , optoelectronics , physics , thermodynamics , organic chemistry , chromatography , quantum mechanics , density functional theory , computational chemistry
The photoluminescence and temperature sensing properties based on down‐shifting emission of Pr 3+ ‐doped (K 0.5 Na 0.5 )NbO 3 – y CaTiO 3 (KNN: y CT) diphasic materials were systematically investigated. Under 447‐nm excitation, Pr 3+ ‐doped KNN: y CT samples exhibited significantly enhanced red emission at 603 nm assigned to 1 D 2 → 3 H 4 transitions of Pr 3+ ions. The red emission intensities reached the optimum value with y = 0.05 near the polymorphic phase transition region. The origin of the enhanced red emission is mainly ascribed to the doping‐induced lattice symmetry change. The energy level transitions from the typical f – f transitions to the valence‐to‐conduction transitions were observed as CaTiO 3 concentration increases above a critical concentration of y = 0.05. Furthermore, the sample with y = 0.05 also possessed excellent temperature response properties in a wide temperature range 300–473 K and the maximum sensing sensitivity was 0.016 K −1 . The Pr 3+ ‐doped (K 0.5 Na 0.5 )NbO 3 – y CaTiO 3 red emission materials with admirable intrinsic piezoelectric properties may have important technological promise in novel multifunctional devices.