A highly efficient, orange light-emitting (K0.5Na0.5)NbO3:Sm3+/Zr4+lead-free piezoelectric material with superior water resistance behavior

Zhang, Qiwei; Chen, Ke; Wang, Leilei; Sun, Haiqin; Wang, Xusheng; Hao, Xihong

doi:10.1039/c4tc02995j

Cited by 55 publications

(28 citation statements)

References 54 publications

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“…As we know, the volatilization of alkali elements (K, Na) in the fabricated KNN‐based ceramics by normal sintering is generally unavoidable . Our previous work has also confirmed the volatilization behaviors by the induced coupled plasma (ICP) . In present case, the presence of Li, Na, and K elements in KNLHN: x Yb ceramics sintered over 1000°C would evaporate at different degree, as observed in some results reported by Park et al and Zhang et al As a consequence, the volatilization of K, Na, or Li elements induces plenty of vacancy‐related defects.…”

Section: Resultssupporting

confidence: 80%

Reversible upconversion switching for Ho/Yb codoped (K,Na)NbO₃ ceramics with excellent luminescence readout capability

et al. 2018

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Luminescent readout capability for photochromic materials plays a critical role in 3D optical data storage applications, especially for inorganic photochromic materials in the solid‐state form. In our previous studies, we found that the luminescent readout capability can be improved using two or multiple‐photon excited luminescent mode (upconversion), which can effectively decrease the destruction degree of the excitation energies to the stored information during the luminescent “reading” process. However, the luminescent readout performance is unsatisfactory owing to the absence of nondestructive luminescence readout capability. Herein, we report a new solid‐state photochromic material with excellent upconversion readout capability: Ho3+/Yb3+ codoped (K,Na)NbO3. Upon 407 nm light irradiation, the luminescent switching contrast (ΔRt) is up to 78%. Particularly, the materials almost have no any re‐absorption to 980 nm light, exhibiting extremely low destruction to information recording points. The luminescent readout intensity retains 96% after constant 980 nm irradiation for 4 minutes at a high pumping power of 1W, which is superior to our previously reported results (Er/Yb codoped Bi2.5Na0.5Nb2O9 materials). This work would help to further develop new inorganic photochromic materials with high performance to satisfy the requirements for optical storage devices.

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Section: Resultssupporting

confidence: 80%

Reversible upconversion switching for Ho/Yb codoped (K,Na)NbO₃ ceramics with excellent luminescence readout capability

et al. 2018

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“…Figure E demonstrates the Commission Internationale de L'Eclairage (CIE) chromaticity coordinates of NaSrLa(MoO 4 )O 3 : x Er 3+ phosphors, which obtained from PL emission spectra. The color coordinates of the phosphors situated in the edge of the green area, approaching the color coordinates of the idea green light (0.210, 0.710) proposed by the National Television System Committee . To analyze the luminescence mechanism of Er 3+ ions in NaSrLa(MoO 4 )O 3 host lattices, a simplified energy level diagram is exhibited in Figure F.…”

Section: Resultsmentioning

confidence: 96%

NUV light induced visible emission in Er³⁺‐activated NaSrLa(MoO₄)O₃ phosphors for green LEDs and thermometer

et al. 2019

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Er3+‐activated NaSrLa(MoO4)O3 phosphors were synthesized by a traditional solid‐state reaction technique, which exhibited bright green emissions ascribing to the (2H11/2, 4S3/2) → 4I15/2 transitions of Er3+ ions under 377 nm excitation. The luminescence intensity increased with increasing the Er3+ ion concentration and achieved its maximum value when the doping concentration was 4 mol%. Moreover, the critical distance was estimated to be 25.32 Å, and the dipole‐dipole interaction played a significant role in NR energy transfer between Er3+ ions in NaSrLa(MoO4)O3 host lattices. At a forward bias current of 100 mA, the Light Emitting Diode (LED) device emitted a bright green emission with the color coordinate of (0.2547, 0.5996) that can be observed by the naked eye. Besides, based on the thermally coupled levels of 2H11/2 and 4S3/2, the temperature sensing performances of the prepared phosphors in the temperature range of 303‐483 K were studied using the fluorescence intensity ratio technique. The maximum sensor sensitivity was about 0.0150 K−1 when the temperature was 483 K, and the Er3+ ion concentration largely influenced the sensor sensitivity of studied samples. Furthermore, the prepared phosphors exhibited excellent water resistance and thermal stability behavior. These characteristics demonstrated that the Er3+ activated NaSrLa(MoO4)O3 phosphors were dual‐functional materials for solid‐state illumination and non‐contact temperature measurement.

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“…In general, the ED transition is dominant when the Sm 3+ ions occupy the lattice sites without an inversion symmetry center. Otherwise, the MD transition will be dominant in the PL emission spectrum when the Sm 3+ ions are located at high symmetry sites within the inversion symmetry center . Note that, in present work, the emission intensity of the 4 G 5/2 → 6 H 9/2 transition was much stronger than that of the 4 G 5/2 → 6 H 5/2 transition (see Figure ), demonstrating that the Sm 3+ ions occupied the low symmetry center sites in the Sr 3 La(VO 4 ) 3 host lattices.…”

Section: Resultsmentioning

confidence: 44%

Photoluminescence, cathodoluminescence and thermal stability of Sm³⁺‐activated Sr₃La(VO₄)₃ red‐emitting phosphors

2017

Luminescence

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A series of Sm -activated Sr La(VO ) phosphors were synthesized by a facile sol-gel method. X-ray diffraction patterns and photoluminescence (PL)/cathodoluminescence (CL) spectra as well as PL decay curves were employed to characterize the obtained samples. Upon 402 nm light excitation, the characteristic emissions of Sm ions corresponding to G → H transitions were observed in all the as-prepared products. The PL emission intensity was increased with increase in Sm ion concentration, while concentration quenching occurred when the doping concentration was over 4 mol%. The non-radiative energy transfer mechanism for concentration quenching of Sm ions was dominated by dipole-dipole interaction and the critical distance was around 21.59 Å. Furthermore, temperature-dependent PL emission spectra revealed that the obtained phosphors possessed good thermal stability with an activation energy of 0.19 eV. In addition, the CL spectra of the samples were almost the same as the PL spectra, and the CL emission intensity showed a tendency to increase with increase in accelerating voltage and filament current. These results suggest that the Sm -activated Sr La(VO ) phosphors with good color coordinates, high color purity and superior thermal stability may be a potential candidate for applications in white light-emitting diodes and field-emission displays as red-emitting phosphors.

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A highly efficient, orange light-emitting (K_0.5Na_0.5)NbO₃:Sm³⁺/Zr⁴⁺lead-free piezoelectric material with superior water resistance behavior

Abstract: Multifunctional luminescent materials based on rare earth doped ferro-/piezoelectrics have attracted much attention due to their potential applications in novel multifunctional devices.

Cited by 55 publications

References 54 publications

Reversible upconversion switching for Ho/Yb codoped (K,Na)NbO₃ ceramics with excellent luminescence readout capability

Reversible upconversion switching for Ho/Yb codoped (K,Na)NbO₃ ceramics with excellent luminescence readout capability

NUV light induced visible emission in Er³⁺‐activated NaSrLa(MoO₄)O₃ phosphors for green LEDs and thermometer

Photoluminescence, cathodoluminescence and thermal stability of Sm³⁺‐activated Sr₃La(VO₄)₃ red‐emitting phosphors

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A highly efficient, orange light-emitting (K0.5Na0.5)NbO3:Sm3+/Zr4+lead-free piezoelectric material with superior water resistance behavior

Abstract: Multifunctional luminescent materials based on rare earth doped ferro-/piezoelectrics have attracted much attention due to their potential applications in novel multifunctional devices.

Cited by 55 publications

References 54 publications

Reversible upconversion switching for Ho/Yb codoped (K,Na)NbO3 ceramics with excellent luminescence readout capability

Reversible upconversion switching for Ho/Yb codoped (K,Na)NbO3 ceramics with excellent luminescence readout capability

NUV light induced visible emission in Er3+‐activated NaSrLa(MoO4)O3 phosphors for green LEDs and thermometer

Photoluminescence, cathodoluminescence and thermal stability of Sm3+‐activated Sr3La(VO4)3 red‐emitting phosphors

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A highly efficient, orange light-emitting (K_0.5Na_0.5)NbO₃:Sm³⁺/Zr⁴⁺lead-free piezoelectric material with superior water resistance behavior

Reversible upconversion switching for Ho/Yb codoped (K,Na)NbO₃ ceramics with excellent luminescence readout capability

Reversible upconversion switching for Ho/Yb codoped (K,Na)NbO₃ ceramics with excellent luminescence readout capability

NUV light induced visible emission in Er³⁺‐activated NaSrLa(MoO₄)O₃ phosphors for green LEDs and thermometer

Photoluminescence, cathodoluminescence and thermal stability of Sm³⁺‐activated Sr₃La(VO₄)₃ red‐emitting phosphors