Effect of phase transition on photoluminescence of Er-doped KNN ceramics

Wu, Xiaomao; Lau, Chi Man; Kwok, Kin Wing

doi:10.1016/j.jlumin.2014.07.005

Cited by 33 publications

(23 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar phenomenon has been observed in Er 3? -doped KNN ceramics [16]. For the ceramic with x = 0, the crystal structure is orthorhombictetragonal coexistence phase, which has been confirmed by our previous work [15].…”

Section: Introductionsupporting

confidence: 80%

See 1 more Smart Citation

Phase transition, electrical and luminescent properties of Dy-doped K0.5Na0.5NbO3-based lead-free ceramics

Wen

Zhou

Zou

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Dy-modified K 0.5 Na 0.5 NbO 3 -based lead-free piezoelectric ceramics of (K 0.48 Na 0.48 Li 0.04 ) 1-x Dy x/3 (Nb 0.90 Ta 0.04 Sb 0.06 )O 3 lead-free piezoelectric ceramics were prepared by a conventional ceramics technique and the effects of Dy 3? doping on the crystal structure, microstructure, dielectric, piezoelectric and luminescent properties of the ceramics were investigated. The ceramics with low Dy levels (x B 0.015) show a pure perovskite structure, while a small amount of secondary phase DyNbO 4 can be detected in the ceramics with x C 0.02. The increase in the level of Dy 3? doping leads to the shift of crystal structure of the ceramics from the coexistence of orthorhombic-tetragonal phases to pseudo-cubic phase. The addition of Dy 3? inhibits the grain growth of the ceramics and induces the diffusive phase transition in the ceramics with high levels of Dy 3? ions. The piezoelectric constant d 33 of the ceramics decreases from 198 to 52 pC/ N with x increasing from 0 to 0.03 because of the shift of the crystal structure of the ceramics from the coexistence of orthorhombic-tetragonal phase to pseudo-cubic phase. The Dy-doped ceramics excited at 453 nm have excellent luminescent properties. Two strong emission spectral bands centered at 476 and 573 nm are observed, corresponding to the transition of the 4 F 9/2 ? 6 H 15/2 and 4 F 9/2 ? 6 H 13/2 levels of Dy 3? , respectively. Our study shows that the ceramic with x = 0.015 possesses simultaneously strong ferroelectricity, good piezoelectricity and excellent luminescence, suggesting that the Dy-doped ceramics may have potential application in multifunctional devices.

show abstract

Section: Introductionsupporting

confidence: 80%

“…. This inhibition of grain [16][17][18]. For the KNLNST-Dy-x ceramics, A-site vacancies of metal ions caused by Dy 3?…”

Section: Introductionmentioning

confidence: 99%

Phase transition, electrical and luminescent properties of Dy-doped K0.5Na0.5NbO3-based lead-free ceramics

Wen

Zhou

Zou

et al. 2015

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…Previous reports have shown that, additionally to the improvement of the piezoelectric properties, luminescent response can be achieved by doping KN and KNN with rare-earths, such as Pr 3+ , Er 3+ and Eu 3+ [16,17,18,19]. Rare-earth doped materials have been of great scientific interest in developing photonic devices and for the next flat-panel display generation.…”

Section: Introductionmentioning

confidence: 99%

“…Eu 3+ -doped materials have been extensively studied because of their transitions from 5 D 0 to 7 F J (J = 0, 1, 2, 3, 4) levels. Mainly, the transition 5 D 0 to 7 F 2 , involved in wavelength peaks around 610–630 nm, shows bright red luminescence and laser action in a variety of glasses and single crystals [16,17,18]. …”

Section: Introductionmentioning

confidence: 99%

Optical and Piezoelectric Study of KNN Solid Solutions Co-Doped with La-Mn and Eu-Fe

et al. 2016

View full text Add to dashboard Cite

The solid-state method was used to synthesize single phase potassium-sodium niobate (KNN) co-doped with the La3+–Mn4+ and Eu3+–Fe3+ ion pairs. Structural determination of all studied solid solutions was accomplished by XRD and Rietveld refinement method. Electron paramagnetic resonance (EPR) studies were performed to determine the oxidation state of paramagnetic centers. Optical spectroscopy measurements, excitation, emission and decay lifetime were carried out for each solid solution. The present study reveals that doping KNN with La3+–Mn4+ and Eu3+–Fe3+ at concentrations of 0.5 mol % and 1 mol %, respectively, improves the ferroelectric and piezoelectric behavior and induce the generation of optical properties in the material for potential applications.

show abstract

“…K 0.5 Na 0.5 NbO 3 (KNN) ceramic, a lead-free ferroelectric material [17], is a good candidate owing to its high chemical, mechanical and physical stability, relatively low lattice phonon energies (~ 860 cm -1 ) and slow multi-phonon relaxation rate [18]. The PL properties of Ln 3+ (Ln = Pr, Eu and Er) have been studied in Ln-doped KNN ceramics [19][20][21][22] together with the ferroelectric properties of the host.…”

Section: Introductionmentioning

confidence: 99%

Enhanced visible and mid-IR emissions in Er/Yb-codoped K0.5Na0.5NbO3 ferroelectric ceramics

Chung

Kwok

2015

Ceramics International

Self Cite

View full text Add to dashboard Cite

Effect of phase transition on photoluminescence of Er-doped KNN ceramics

Cited by 33 publications

References 36 publications

Phase transition, electrical and luminescent properties of Dy-doped K0.5Na0.5NbO3-based lead-free ceramics

Phase transition, electrical and luminescent properties of Dy-doped K0.5Na0.5NbO3-based lead-free ceramics

Optical and Piezoelectric Study of KNN Solid Solutions Co-Doped with La-Mn and Eu-Fe

Enhanced visible and mid-IR emissions in Er/Yb-codoped K0.5Na0.5NbO3 ferroelectric ceramics

Contact Info

Product

Resources

About