Publication Date:
2014-11-26
Description:
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.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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