A study on Site Preferences of Eu3+ Dopants in La3+, Ca2+ sites of La2CaB8O16 crystal

Wang, Yu; Li, Luo; Guo, Rui; Xiong, Zhihua; Gao, Mingyuan

doi:10.1016/j.jlumin.2019.116923

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…The influence of Dy 3+ by the crystal structure depends on the position occupied by Dy 3+ in the host lattice and the crystal symmetry. The crystal field around Dy 3+ strengthens after the substitution of Ln 3+ for Ca 2+ , and the symmetry around Dy 3+ decreases with the increase in substitution amount; thus, the luminescence intensity is enhanced. , However, Ln 3+ occupying the Ca 2+ position will cause local charge imbalance within the host and produce lattice defects (holes) . Meanwhile, due to the different ionic radii of Ln 3+ and Ca 2+ , excessive substitution can form numerous lattice distortions.…”

Section: Resultsmentioning

confidence: 99%

Effect of Partial Ca²⁺ Substitution with Ln³⁺ (Ln = Y, La) on Luminescence Enhancement of Ca_18.62Zn₂(PO₄)₁₄:0.38Dy³⁺ White-Emitting Phosphor for White Light-Emitting Diodes

Huang

Wang

Zhang

et al. 2021

ACS Appl. Electron. Mater.

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A sequence of white-emitting Ca18.62–x Ln x Zn2(PO4)14:0.38Dy3+ (Ln = Y, La) phosphors were synthesized by a high-temperature solid-phase method. The luminescence enhancement of Ca18.62–x Ln x Zn2(PO4)14:0.38Dy3+ phosphors via Ln3+ partial substitution was investigated. Since Ln3+ and Ca2+ ions have similar ionic radii, XRD results showed that Ln3+ could enter into the lattice without changing the host structure and the luminescence performance was further enhanced by affecting the lattice environment around the luminescence center. When the substitution amounts of Y3+ and La3+ were respectively x = 0.57 and 0.76 in the Ca18.62–x Ln x Zn2(PO4)14:0.38Dy3+ phosphor, the optimal luminescence performance could be acquired, and the luminescence intensity could be increased to 1.43 and 1.55 times the original intensity, respectively. Meanwhile, the cation substitution can greatly improve the thermal stability and enhance the activation energy of phosphor. Finally, the w-LEDs with neutral white light emitting were obtained by coating the as-prepared phosphor on an n-UV chip, and the color rendering index and correlated color temperature were measured as 85.8 and 5071 K, respectively. All the results indicated that the Ca18.62–x Ln x Zn2(PO4)14:0.38Dy3+ phosphor is an excellent candidate as a single-component white-emitting phosphor.

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Section: Resultsmentioning

confidence: 99%

Effect of Partial Ca²⁺ Substitution with Ln³⁺ (Ln = Y, La) on Luminescence Enhancement of Ca_18.62Zn₂(PO₄)₁₄:0.38Dy³⁺ White-Emitting Phosphor for White Light-Emitting Diodes

Huang

Wang

Zhang

et al. 2021

ACS Appl. Electron. Mater.

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“…We noticed that the triclinic La 2 CaB 8 O 16 (LCB 8 ) was reported as La 2 O 3 ·CaO·4B 2 O 3 for the first time in 1977 . The luminescent properties of rare-earth-ion-doped LCB 8 powders were studied during 2003–2020. − Its alkaline earth analogue La 2 SrB 8 O 16 was reported in 2021 . We performed crystal growth experiments and successfully obtained Nd 3+ -doped LCB 8 crystals with sufficient size and relatively high optical quality.…”

Section: Introductionmentioning

confidence: 99%

Universal Method for Determining the Principal Optical Indicatrix Axes in Triclinic Crystals

Feng

Bai

Zhang

2023

Crystal Growth & Design

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Determining the orientations of principal optical indicatrix axes is a key prerequisite for the applications of optical crystals, which is still an intriguing challenge for triclinic optical crystals due to the lowest symmetry. The prism method is one of the important ways to determine these directions, but no actual examples are available owing to the complexity and scarcity of the triclinic crystals so far. To solve this remaining problem among seven crystal systems, we proposed a universal method, the so-called “multiple prisms method,” to determine the orientations of principal optical indicatrix axes X, Y, and Z as well as the principal refractive index values n x , n y , and n z in triclinic crystals based on four prisms and demonstrated this method by employing triclinic Nd3+-doped La2CaB8O16 crystals, which is of great significance to the studies and applications of triclinic optical crystals in the future.

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“…Its cell parameters and space group were reported in 2003, but the powder diffraction data and complete structure information are still absent in the PDF and ICSD databases to date. During 2009–2020, luminescent properties of RE 3+ -doped LCB 8 (RE 3+ = Nd 3+ , Eu 3+ , and Tb 3+ ) powders were widely investigated, but their single crystals with large size and high quality have not been obtained, − which is not conducive to the further systematic studies on its laser performances. In this work, pure and Nd 3+ -doped LCB 8 crystals with sufficient size and relatively high optical quality have been successfully grown.…”

Section: Introductionmentioning

confidence: 99%

Nd³⁺-Doped La₂CaB₈O₁₆ Crystals for Orthogonally Polarized Dual-Wavelength Near-Infrared Lasers

et al. 2023

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The Nd3+-based laser crystal is one of the key gain media for all-solid-state laser technology. Herein, by investigating the relationship between structure and optical properties, we found that a La-containing borate, La2CaB8O16, with a long rare-earth ion distance more than 4.27 Å, allows a high doping concentration and exhibits a weak fluorescence quenching effect. For the first time, Nd3+-doped La2CaB8O16 crystals with different concentrations were grown by the top seeded solution growth method with large size and high optical quality. Its spectral characters were measured, suggesting a strong absorption band at 800 nm and a fluorescence band at 1055 nm. Furthermore, a diode-pumped orthogonally polarized dual-wavelength laser operation at 1052 and 1055 nm was realized, with a slope efficiency of 16.3% and output power of 859 mW. These results suggest that the Nd3+-doped La2CaB8O16 crystal is a promising laser gain medium for 1 μm lasers and possible generation of terahertz radiation.

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A study on Site Preferences of Eu3+ Dopants in La3+, Ca2+ sites of La2CaB8O16 crystal

Cited by 7 publications

References 27 publications

Effect of Partial Ca²⁺ Substitution with Ln³⁺ (Ln = Y, La) on Luminescence Enhancement of Ca_18.62Zn₂(PO₄)₁₄:0.38Dy³⁺ White-Emitting Phosphor for White Light-Emitting Diodes

Effect of Partial Ca²⁺ Substitution with Ln³⁺ (Ln = Y, La) on Luminescence Enhancement of Ca_18.62Zn₂(PO₄)₁₄:0.38Dy³⁺ White-Emitting Phosphor for White Light-Emitting Diodes

Universal Method for Determining the Principal Optical Indicatrix Axes in Triclinic Crystals

Nd³⁺-Doped La₂CaB₈O₁₆ Crystals for Orthogonally Polarized Dual-Wavelength Near-Infrared Lasers

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A study on Site Preferences of Eu3+ Dopants in La3+, Ca2+ sites of La2CaB8O16 crystal

Cited by 7 publications

References 27 publications

Effect of Partial Ca2+ Substitution with Ln3+ (Ln = Y, La) on Luminescence Enhancement of Ca18.62Zn2(PO4)14:0.38Dy3+ White-Emitting Phosphor for White Light-Emitting Diodes

Effect of Partial Ca2+ Substitution with Ln3+ (Ln = Y, La) on Luminescence Enhancement of Ca18.62Zn2(PO4)14:0.38Dy3+ White-Emitting Phosphor for White Light-Emitting Diodes

Universal Method for Determining the Principal Optical Indicatrix Axes in Triclinic Crystals

Nd3+-Doped La2CaB8O16 Crystals for Orthogonally Polarized Dual-Wavelength Near-Infrared Lasers

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Product

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About

Effect of Partial Ca²⁺ Substitution with Ln³⁺ (Ln = Y, La) on Luminescence Enhancement of Ca_18.62Zn₂(PO₄)₁₄:0.38Dy³⁺ White-Emitting Phosphor for White Light-Emitting Diodes

Effect of Partial Ca²⁺ Substitution with Ln³⁺ (Ln = Y, La) on Luminescence Enhancement of Ca_18.62Zn₂(PO₄)₁₄:0.38Dy³⁺ White-Emitting Phosphor for White Light-Emitting Diodes

Nd³⁺-Doped La₂CaB₈O₁₆ Crystals for Orthogonally Polarized Dual-Wavelength Near-Infrared Lasers