Influences of Mg2+ion on dopant occupancy and upconversion luminescence of Ho3+ion in LiNbO3crystal

Dai, Li; Xu, Chao; Zhang, Ying; Li, Dayong; Xu, Yuheng

doi:10.1088/1674-1056/22/9/094201

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…The dependence of the green and red emissions on the excitation power was calculated according to Auzel's method, I ∝ P n , where P is the pumping laser power, and n is the number of laser photons required in populating the upper emitting state. [35] The slope n, which is nearly 2, indicates the following results: 1) both the red and green UC emissions are two photon absorption routes; [36] 2) the Mg 2+ doping does not affect the UC mechanism.…”

Section: Resultsmentioning

confidence: 92%

Shape controllable synthesis and enhanced upconversion photoluminescence of ${{\beta }}$-NaGdF ₄ :Yb ³⁺ , Er ³⁺ nanocrystals by introducing Mg ²⁺

Yang

Zhao

et al. 2017

Chinese Phys. B

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Different concentrations of Mg 2+ -doped hexagonal phase NaGdF 4 :Yb 3+ , Er 3+ nanocrystals (NCs) were synthesized by a modified solvothermal method. Successful codoping of Mg 2+ ions in upconversion nanoparticles (UCNPs) was supported by XRD, SEM, EDS, and PL analyses. The effects of Mg 2+ doping on the morphology and the intensity of the upconversion (UC) emission were discussed in detail. It turned out that with the concentration of Mg 2+ increasing, the morphology of the nanoparticles turn to change gradually and the UC emission was increasing gradually as well. Notably the UC fluorescence intensities of Er 3+ were gradually improved owing to the codoped Mg 2+ and then achieved a maximum level as the concentration of Mg 2+ ions was 60 mol% from the amendment of the crystal structure of β -NaGdF 4 :Yb 3+ , Er 3+ nanoparticles. Moreover, the UC luminescence properties of the rare-earth (Yb 3+ , Er 3+ ) ions codoped NaGdF 4 nanocrystals were investigated in detail under 980-nm excitation.

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Section: Resultsmentioning

confidence: 92%

Shape controllable synthesis and enhanced upconversion photoluminescence of ${{\beta }}$-NaGdF ₄ :Yb ³⁺ , Er ³⁺ nanocrystals by introducing Mg ²⁺

Yang

Zhao

et al. 2017

Chinese Phys. B

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“…By now, several schemes have been proposed to experimentally realize the UC luminescence enhancement, suppression, and tuning. For example, a common method is to adjust the material property by varying its dopant-host combination, [13][14][15] nanoparticle size, [16,17] and dopant concentration [18,19] in the synthesis process, and the other common method is to control the laser parameter by varying the excitation wavelength, [20] power density, [21] pulse duration, [22] spectral phase [23,24] or polarization. [25,26] In addition, applying an electric or magnetic field has also been proved to be an available method to control the UC luminescence.…”

Section: Introductionmentioning

confidence: 99%

Up-conversion luminescence polarization control in Er ³⁺ -doped NaYF ₄ nanocrystals

et al. 2016

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We propose a femtosecond laser polarization modulation scheme to control the up-conversion (UC) luminescence in Er3+-doped NaYF4 nanocrystals dispersed in the silicate glass. We show that the UC luminescence can be suppressed when the laser polarization is changed from linear through elliptical to circular, and the higher repetition rate will yield the lower control efficiency. We theoretically analyze the physical control mechanism of the UC luminescence polarization modulation by considering on- and near-resonant two-photon absorption, energy transfer up-conversion, and excited state absorption, and show that the polarization control mainly comes from the contribution of near-resonant two-photon absorption. Furthermore, we propose a method to improve the polarization control efficiency of UC luminescence in rare-earth ions by applying a two-color femtosecond laser field.

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Improved piezoelectric and bright up-conversion photoluminescent properties in Ho-doped Bi0.5Na0.5TiO3–BaTiO3 lead-free ceramics

Zhou

Zou

Tian

et al. 2015

J Mater Sci: Mater Electron

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Lead-free ceramics of 0.94(Bi 1-x Ho x Na) 0.5 TiO 3 -0.06BaTiO 3 have been prepared by a conventional solid reaction method and their piezoelectric, ferroelectric and photoluminescent properties have been studied. After the partial substitution of Ho 3? for Bi 3? , a new Bi 0.5 Na 0.5 TiO 3 -based solid solution with a pure perovskite structure is formed. The doping of Ho 3? has no obvious influence on the crystal structure of the ceramics. After the addition of a small amount of Ho 3? (x = 0.015), the piezoelectricity (d 33 = 187 pC/N, k p = 41.1 %, respectively) and ferroelectricity (P r = 25.2 lC/cm 2 ) of ceramics are enhanced. The down-conversion and up-conversion photoluminescence of the ceramics are observed. A green down-conversion emission band at 548 nm is observed which is from the 5 S 2 ? 5 I 8 transition of Ho 3? ; the main down-conversion excitation bands located at 410-500 nm is due to the 5 I 8 ? 5 G 5, 6 transitions, and the maximum brightness of down-conversion photoluminescence are obtained at x = 0.015. The ceramic with x = 0.01 exhibits the maximum value of the up-conversion emission at 475 nm, which is attributed to the 5 F 3 ? 5 I 8 transition. Our study shows that the ceramics with x = 0.01-0.02 exhibit simultaneously good piezoelectricity, strong ferroelectricity and excellent photoluminescence, suggesting a potential application in the electro-optic devices.

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Influences of Mg²⁺ion on dopant occupancy and upconversion luminescence of Ho³⁺ion in LiNbO₃crystal

Cited by 5 publications

References 25 publications

Shape controllable synthesis and enhanced upconversion photoluminescence of ${{\beta }}$-NaGdF ₄ :Yb ³⁺ , Er ³⁺ nanocrystals by introducing Mg ²⁺

Shape controllable synthesis and enhanced upconversion photoluminescence of ${{\beta }}$-NaGdF ₄ :Yb ³⁺ , Er ³⁺ nanocrystals by introducing Mg ²⁺

Up-conversion luminescence polarization control in Er ³⁺ -doped NaYF ₄ nanocrystals

Improved piezoelectric and bright up-conversion photoluminescent properties in Ho-doped Bi0.5Na0.5TiO3–BaTiO3 lead-free ceramics

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Influences of Mg2+ion on dopant occupancy and upconversion luminescence of Ho3+ion in LiNbO3crystal

Cited by 5 publications

References 25 publications

Shape controllable synthesis and enhanced upconversion photoluminescence of ${{\beta }}$-NaGdF 4 :Yb 3+ , Er 3+ nanocrystals by introducing Mg 2+

Shape controllable synthesis and enhanced upconversion photoluminescence of ${{\beta }}$-NaGdF 4 :Yb 3+ , Er 3+ nanocrystals by introducing Mg 2+

Up-conversion luminescence polarization control in Er 3+ -doped NaYF 4 nanocrystals

Improved piezoelectric and bright up-conversion photoluminescent properties in Ho-doped Bi0.5Na0.5TiO3–BaTiO3 lead-free ceramics

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Influences of Mg²⁺ion on dopant occupancy and upconversion luminescence of Ho³⁺ion in LiNbO₃crystal

Shape controllable synthesis and enhanced upconversion photoluminescence of ${{\beta }}$-NaGdF ₄ :Yb ³⁺ , Er ³⁺ nanocrystals by introducing Mg ²⁺

Shape controllable synthesis and enhanced upconversion photoluminescence of ${{\beta }}$-NaGdF ₄ :Yb ³⁺ , Er ³⁺ nanocrystals by introducing Mg ²⁺

Up-conversion luminescence polarization control in Er ³⁺ -doped NaYF ₄ nanocrystals