Synthesis and optical properties of Dy3+, Li+ doped CaMoO4 phosphor

Guan, Li; Jia, Guoqi; Yang, Binsheng; Xu, Li; Jin, Lei; Yang, Zhiping; Fu, Guangsheng

doi:10.1016/s1002-0721(10)60494-2

Cited by 28 publications

(5 citation statements)

References 19 publications

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“…Ran et al have investigated the effect of monovalent alkali-metal ions such as Li, Na, and K on energy transfer efficiency from Bi 3+ to Eu 3+ in ZnMoO 4 :Eu 3+ :Bi 3+ . Li et al have also studied the effect of Li + ions in the scheelite host CaMoO 4 , but they used Dy 3+ as the activator ion instead of Eu 3+ . Further, in another work, Li et al extended their observation of the effect of Li + , Na + , and K + on the PL enhancement of Tb 3+ -codoped CaMoO 4 phosphors.…”

Section: Introductionmentioning

confidence: 99%

Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

et al. 2018

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Studies have been carried out to understand the specific role of the alkali charge compensator on the luminescence properties of an alkali ion (Li, Na, and K) codoped SrWO:Eu phosphor. The oxidation state of the europium ion was found to be +3 on the basis of X-ray absorption near edge structure (XANES) measurements. This is the first report of its kind where opposite effects of Li ion and Na/K ions on photoluminescence intensity have been observed. Li ion codoping enhanced the photoluminescence intensity from SrWO:Eu phosphor while Na/K ion codoping did not. On the other hand, the luminescence lifetime is maximum for the Na ion codoped sample and minimum for the Li ion codoped sample. The results could be explained successfully using time-resolved luminescence, positron annihilation lifetime spectroscopy (PALS), and extended X-ray absorption fine structure (EXAFS) spectroscopy measurements. Changes in the Eu-O bond length and Debye-Waller Factor (σ) upon Li/Na/K codoping were monitored through EXAFS measurements. PALS also highlighted the fact that Li codoping is not contributing to reduction in the cation vacancies and might be occupying interstitial sites rather than lattice positions due to its very small size. On europium doping there is lowering in symmetry of SrO polyhedra from S to C, which is reflected in an intense electric dipole transition in comparison to the magnetic dipole transition. This is also corroborated using trends in Judd-Ofelt parameters. The results have shown that the luminescence lifetime is better when the vacancy concentration is lower as induced by Na and K codoping, while the emission intensity is higher in the samples when distortion around Eu is reduced as induced by Li codoping.

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Section: Introductionmentioning

confidence: 99%

Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

et al. 2018

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“…Importantly, for the single-doped 0.03D y 3+ phosphors, the decay curve exhibits a double exponential nature due to the different sites of D y 3+ ions (figure 7 a ), whereas for the D y 3+ /Tb 3+ co-doped samples, the decay curves displayed a non-exponential nature (figure 7 b ) [46,51]. Hence, the decay of PL [Ifalse(tfalse)] could be fitted according to the below equation,Ifalse(tfalse)=I0+A1normale−t/τ1+A2normale−t/τ2,where I0, A1 and A2 are simply constants, whereas τ1 andτ2 are decay constants [52]. In addition, the average lifetime ⟨τ⟩ is expressed as false(A1τ12+A2τ22false)/false(A1τ1+A2τ2false).…”

Section: Resultsmentioning

confidence: 99%

“…where I 0 , A 1 and A 2 are simply constants, whereas t 1 andt 2 are decay constants [52]. In addition, the average lifetime t h i is expressed as…”

Section: Photoluminescence Processes In Dymentioning

confidence: 99%

Photoluminescence processes in τ -phase Ba _1.3 Ca _{0.7-
x
-
y} SiO ₄ : x D y ³⁺ / y Tb ³⁺ phosphors for solid-state lighting

et al. 2022

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The τ -phase Ba 1.3 Ca 0.7- x - y SiO 4 : x D y 3+ / y Tb 3+ phosphors co-doped with D y 3+ ( x = 0.03) and Tb 3+ ( y = 0.01–0.05) trivalent rare-earth ions were prepared by the gel-combustion method. The structure–property relation of the samples was examined by X-ray diffraction, scanning electron microscopy and spectrophotometer. Here, the effect of Tb 3+ 's concentration on the spectroscopic properties of Ba 1.3 Ca 0.7- x - y SiO 4 : x D y 3+ / y Tb 3+ phosphors was explored by using the photoluminescence excitation, emission and decay curves. Importantly, the photonic energy transfer from (D y 3+ : 4 F 9/2 + Tb 3+ : 7 F 6 ) to (D y 3+ : 6 H 15/2 + Tb 3+ : 5 D 4 ) was observed, in which the D y 3+ ions act as a light-emitting donor whereas the Tb 3+ ions as a light-absorbing acceptor, resulting in an enhanced emission from the co-doped Ba 1.3 Ca 0.7- x - y SiO 4 : x D y 3+ / y Tb 3+ ( x = 0.03 and y = 0.01–0.05) phosphors. Finally, the chromaticity coordinates were determined from the measured emission spectra, locating at the green and white light regions. This observation indicates that the characteristic emission colour could be tuned from white to green by varying Tb 3+ concentrations under ultraviolet light.

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“…This approach has been employed in several phosphors, like CaMO : Dy ( M = W, Mo ), Y Zr O : Dy , YBO : Eu , YPO : Eu , etc. [160][161][162][163]. The co-doping of monovalent alkali metal ions reduces the charge unbalancing problem originated by doping of trivalent rare-earth ions at divalent alkaline earth metal ions ( Ca , Sr , Br ).…”

Section: Optical Propertiesmentioning

confidence: 99%

Ruddlesden-Popper phase A2BO4 oxides: Recent studies on structure, electrical, dielectric, and optical properties

2020

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In the last two decades, structure and properties of Ruddlesden-Popper phase (RP) A 2 BO 4 oxides with K 2 NiF 4 structure, have been widely investigated. But to the best of our knowledge, no review article is available in the literature on recent studies on these oxides. Therefore, in this article, recent studies on structure, electrical, dielectric, and optical properties of these oxides have been reviewed. Special attention is put on to highlight the effect of doping and oxygen stoichiometry on the structure and properties of these oxides. Further, important applications of these oxides have also been mentioned in this article.

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Synthesis and optical properties of Dy3+, Li+ doped CaMoO4 phosphor

Cited by 28 publications

References 19 publications

Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Photoluminescence processes in τ -phase Ba _1.3 Ca _{0.7-
x
-
y} SiO ₄ : x D y ³⁺ / y Tb ³⁺ phosphors for solid-state lighting

Ruddlesden-Popper phase A2BO4 oxides: Recent studies on structure, electrical, dielectric, and optical properties

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Synthesis and optical properties of Dy3+, Li+ doped CaMoO4 phosphor

Cited by 28 publications

References 19 publications

Deciphering the Role of Charge Compensator in Optical Properties of SrWO4:Eu3+:A (A = Li+, Na+, K+): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Deciphering the Role of Charge Compensator in Optical Properties of SrWO4:Eu3+:A (A = Li+, Na+, K+): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Photoluminescence processes in τ -phase Ba 1.3 Ca 0.7- x - y SiO 4 : x D y 3+ / y Tb 3+ phosphors for solid-state lighting

Ruddlesden-Popper phase A2BO4 oxides: Recent studies on structure, electrical, dielectric, and optical properties

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Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Deciphering the Role of Charge Compensator in Optical Properties of SrWO₄:Eu³⁺:A (A = Li⁺, Na⁺, K⁺): Spectroscopic Insight Using Photoluminescence, Positron Annihilation, and X-ray Absorption

Photoluminescence processes in τ -phase Ba _1.3 Ca _{0.7-
x
-
y} SiO ₄ : x D y ³⁺ / y Tb ³⁺ phosphors for solid-state lighting