Crystal structure and photo-luminescence of Gd3Ga2(Al3-Si )(O12-N ):Ce3+ phosphors for AC-warm LEDS

Mao, Aijun; Zhao, Zhengyan; Wang, Jiantao; Yang, Changxing; Ren, Jiejun; Wang, Yuhua

doi:10.1016/j.cej.2019.02.185

Cited by 21 publications

(11 citation statements)

References 44 publications

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“…As the concentration of Sr 2+ solid solution increases, the emission is gradually blue-shifted because the substitution of Ca 2+ by Sr 2+ is a large ionic radius substitution, which gives birth to lattice expansion, weakening of the crystal field, an increase in the band gap and reduction in energy level cleavage. 37 At the same time, DRS and density functional theory were used to calculate the band gap of the series of samples. The calculated values from DRS and density functional theory (DFT) are exhibited in Fig.…”

Section: Photoluminescence Propertiesmentioning

confidence: 99%

Enhancing the luminescence performance of Ca_2−xSr_xBO₃Cl:Eu²⁺,Dy³⁺ by substitution of Sr²⁺ for Ca²⁺

et al. 2022

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Section: Photoluminescence Propertiesmentioning

confidence: 99%

Enhancing the luminescence performance of Ca_2−xSr_xBO₃Cl:Eu²⁺,Dy³⁺ by substitution of Sr²⁺ for Ca²⁺

et al. 2022

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“…The aforementioned emission color allows for various applications, such as in electronics, warning signs, LED displays, or medicine. Furthermore, the Pr ion is very often used as an admixture in various compound groups such as perovskites, phosphates, , or garnets. , Even now, lots of new research are being carried out in this area, and as such recently a new concept for the improvement of orange-red emission based on the Pr 3+ /Ce 3+ combination has been presented . From all of the aforementioned compound groups, garnets in particular have attracted the attention of researchers due to their chemical stability, high quantum efficiency of rare-earth (RE)-doped structures, and possibility of tuning optical properties by cationic substitution .…”

Section: Introductionmentioning

confidence: 99%

Insights into the Relationship between Crystallite Size, Sintering Pressure, Temperature Sensitivity, and Persistent Luminescence Color of Gd_2.97Pr_0.03Ga₃Al₂O₁₂ Powders and Ceramics

et al. 2022

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In order to obtain Gd 2.97 Pr 0.03 Ga 3 Al 2 O 12 powders with different crystallite sizes, a modified Pechini (sol−gel) method was used. Powders were then used for the preparation of ceramics by a high-pressure low-temperature sintering method. The impact of crystallite size and pressure applied during the sintering procedure on conventional and persistent luminescence was investigated and analyzed. It was found that the emission color is strictly dependent on the crystallite size, as such phenomenon may be used in the field of advanced anti-counterfeiting. The spectroscopic properties of Gd 2.97 Pr 0.03 Ga 3 Al 2 O 12 were characterized by means of photoluminescence measurements. The kinetics of luminescence were measured in order to analyze the energy transfer between 3 P 0 and 1 D 2 excited states that also take an active role in the persistent luminescence process. It was found that an increase in the crystallite size led to a higher energy transfer from the 3 P 0 to 1 D 2 level and a change in the emission color. As such, it was studied for potential application in ratiometric optical thermometry. The effect was also investigated in terms of persistent luminescence. It was also found that the sintering pressure causes changes in the crystallographic parameters of the powders and, in consequence, has a great impact on the optical properties of ceramics. The conducted research gives insights into the mechanism of persistent luminescence and expands the application field of optical storage materials.

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“…As the typical illumination source, phosphor-converted white light-emitting diodes (abbreviated as pc-WLEDs) have been extensively explored due to their obvious advantages of high luminous efficiency, long lifetime, energy saving, and eco-friendly features in comparison with the commercial products of fluorescent lamps. − Commercially, the traditional treatment for pc-WLEDs is to integrate blue-emitting LED chip with a yellow YAG/Ce 3+ -based active material . However, the intrinsic deficiency of red emission in overall emission leads to a low color rendering index (Ra, <75) and high correlated color temperature (CCT, >4500 K), which seriously hinders its further practical application in indoor and medical lighting. , To circumvent the abovementioned problems, the desired white light should be tuned by mixing ratios of red/green/blue (RGB) emissions irradiated by a near-UV ( n -UV, 350–420 nm) LED chip. − Therefore, it is necessary to search for a novel tricolor sample that can be illuminated by the n -UV radiation.…”

Section: Introductionmentioning

confidence: 99%

Extension of Spectral Shift Controls from Equivalent Substitution to an Energy Migration Model Based on Eu²⁺/Tb³⁺-Activated Ba_4–xSr_xGd_3–xLu_xNa₃(PO₄)₆F₂ Phosphors

Mei

et al. 2021

Inorg. Chem.

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Single-phase phosphors with tunable emission colors are crucial to develop high-performance white light-emitting diodes since they are valuable to improve the energy efficiency, color rendering index, and correlated color temperature. Most of the studies have been conducted to control the spectral shifts via a polyhedral distortion or chemical unit cosubstitution strategy. The combination of host optimization and dopant activator design in a single-phase phosphor system is very rare. Herein, a partial substitution strategy of [Ba 2+ − Gd 3+ ] by [Sr 2+ −Lu 3+ ] has been employed in Ba 4−x Sr x Gd 3−x−y Lu x Na 3 (PO 4 ) 6 F 2 / 5% Eu 2+ (x = 0−0.40) phosphors. Also, the energy migration from Eu 2+ to Tb 3+ ions has been investigated in as-prepared samples. Consequently, the emitted signal is observed to shift from 470 to 575 nm derived from equivalent substitutions, which is attributed to specific performance by the emission profile of Eu 2+ , and such results are closely related to splitting of the crystal field and energy transfer among various luminescent centers. Moreover, the tunable yellowish-green emitting material has been assembled by incorporating ion pairs (Eu 2+ → Tb 3+ ) into the Ba 3.85 Sr 0.15 Gd 2.85 Lu 0.15 Na 3 (PO 4 ) 6 F 2 , and their relative ratios are varied. The corresponding Eu 2+ → Tb 3+ energy migration process is assigned to be the dipole−quadrupole interaction by the Inokuti−Hirayama model. This work provides rational guidance for the design and discovery of new products with tunable emission colors, originating from the cosubstitution strategy and energy conversion model.

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Crystal structure and photo-luminescence of Gd3Ga2(Al3-Si )(O12-N ):Ce3+ phosphors for AC-warm LEDS

Cited by 21 publications

References 44 publications

Enhancing the luminescence performance of Ca_2−xSr_xBO₃Cl:Eu²⁺,Dy³⁺ by substitution of Sr²⁺ for Ca²⁺

Enhancing the luminescence performance of Ca_2−xSr_xBO₃Cl:Eu²⁺,Dy³⁺ by substitution of Sr²⁺ for Ca²⁺

Insights into the Relationship between Crystallite Size, Sintering Pressure, Temperature Sensitivity, and Persistent Luminescence Color of Gd_2.97Pr_0.03Ga₃Al₂O₁₂ Powders and Ceramics

Extension of Spectral Shift Controls from Equivalent Substitution to an Energy Migration Model Based on Eu²⁺/Tb³⁺-Activated Ba_4–xSr_xGd_3–xLu_xNa₃(PO₄)₆F₂ Phosphors

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Crystal structure and photo-luminescence of Gd3Ga2(Al3-Si )(O12-N ):Ce3+ phosphors for AC-warm LEDS

Cited by 21 publications

References 44 publications

Enhancing the luminescence performance of Ca2−xSrxBO3Cl:Eu2+,Dy3+ by substitution of Sr2+ for Ca2+

Enhancing the luminescence performance of Ca2−xSrxBO3Cl:Eu2+,Dy3+ by substitution of Sr2+ for Ca2+

Insights into the Relationship between Crystallite Size, Sintering Pressure, Temperature Sensitivity, and Persistent Luminescence Color of Gd2.97Pr0.03Ga3Al2O12 Powders and Ceramics

Extension of Spectral Shift Controls from Equivalent Substitution to an Energy Migration Model Based on Eu2+/Tb3+-Activated Ba4–xSrxGd3–xLuxNa3(PO4)6F2 Phosphors

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Enhancing the luminescence performance of Ca_2−xSr_xBO₃Cl:Eu²⁺,Dy³⁺ by substitution of Sr²⁺ for Ca²⁺

Enhancing the luminescence performance of Ca_2−xSr_xBO₃Cl:Eu²⁺,Dy³⁺ by substitution of Sr²⁺ for Ca²⁺

Insights into the Relationship between Crystallite Size, Sintering Pressure, Temperature Sensitivity, and Persistent Luminescence Color of Gd_2.97Pr_0.03Ga₃Al₂O₁₂ Powders and Ceramics

Extension of Spectral Shift Controls from Equivalent Substitution to an Energy Migration Model Based on Eu²⁺/Tb³⁺-Activated Ba_4–xSr_xGd_3–xLu_xNa₃(PO₄)₆F₂ Phosphors