Publication Date:
2014-07-30
Description:
A mutual enhancement action between the ferro-/piezoelectric polarization and the photoluminescent performance of rare earth Pr 3+ doped (K 0.5 Na 0.5 )NbO 3 (KNN) lead-free ceramics is reported. After Pr 3+ doping, the KNN ceramics exhibit the maximum enhancement of ∼1.2 times in the ferroelectric remanent polarization strength and ∼1.25 times in the piezoelectric coefficient d 33 , respectively. Furthermore, after undergoing a ferro-/piezoelectric polarization treatment, the maximum enhancement of ∼1.3 times in photoluminescence (PL) was observed in the poled 0.3% Pr 3+ doped sample. After the trivalent Pr 3+ unequivalently substituting the univalent (K 0.5 Na 0.5 ) + , A-sites ionic vacancies will occur to maintain charge neutrality, which may reduce the inner stress and ease the domain wall motions, yielding to the enhancement in ferro-/piezoelectric performance. The polarization-induced enhancement in PL is attributed to the decrease of crystal symmetry abound the Pr 3+ ions after polarization. The dual-enhancement of the ferro-/piezoelectric and photoluminescent performance makes the Pr 3+ doped KNN ceramic hopeful for piezoelectric/luminescent multifunctional devices.
Print ISSN:
0003-6951
Electronic ISSN:
1077-3118
Topics:
Physics
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