Enhancement of luminescence emission from GdVO4:Er3+/Yb3+ phosphor by Li+ co-doping

The present paper reports a theoretical investigation based on first-principles density functional theory calculations to predict the external morphology of the tetragonal GdVO4 crystal from its internal structure. The Bravais–Friedel–Donnay–Harker (BFDH) method, attachment energy (AE) method and surface energy (SE) method were used in this study. Slice energies (cohesive, attachment and specific surface) of the three main crystal faces having (110), (101) and (200) orientation and their d hkl thicknesses were computed using CRYSTAL17 code, in the frame of a 2D periodic slab model. The relative growth rate (R hkl ) and the morphological importance (MI hkl ) for each unrelaxed and relaxed (hkl) face of interest were determined. Consequently, the crystal shapes predicted based upon BFDH, AE and SE methods were represented by the Wulff construction. The results of the morphology crystal predictions, based on the above methods, were compared both against each other and against the experimentally observed morphologies. A quite satisfactory agreement between the predicted and observed crystal morphologies is noticed.

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“…3(b) is confirmed by the experimentally observed crystal shape in Fig. 4(b) (Gavrilović et al, 2014).…”

Section: Figuresupporting

confidence: 75%

Morphology of the GdVO₄crystal: first-principles studies

Eftimie¹,

Avram²,

Jelsch³

et al. 2020

Acta Crystallogr Sect B

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“…from LiSrPO 4 and Li 2 CaAl 4 (PO 4 ) 4 F 4 , respectively. This may be due to the EDS detector being less sensitive to Li . Figure (inset) gives the weight percent of all the elements detected by the EDS.…”

Section: Resultsmentioning

confidence: 99%

Tunable emission from LiBaBO₃:Eu³⁺;Bi³⁺ phosphor for solid‐state lighting

et al. 2017

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Europium (Eu ) and bismuth (Bi ) co-activated LiBaBO powder phosphors were synthesized by a solid-state reaction and the structure, particle morphology, optical and photoluminescent properties were investigated. X-Ray diffraction patterns of the LiBaBO phosphors crystallized in a pure monoclinic phase, i.e. there were no secondary phases due to either incidental impurities or undecomposed starting materials. Scanning electron microscopy images showed that the powders were made up of fluffy needle-like particles that were randomly aligned. The band-gap of the LiBaBO host was estimated to be 3.33 eV from the UV/vis absorption data. Blue emission was observed from the LiBaBO host, which is ascribed to self-activation of the host matrix. In addition, greenish-blue (493 nm) and red (613 nm) emissions were observed from europium-doped samples and were attributed to the emissions of Eu and Eu , respectively. Furthermore, after codoping with Bi , the emission intensity of Eu located at 613 nm was significantly enhanced. From the Commission Internationale de I'Eclairage (CIE) color coordinates, white emission was observed from LiBa BO :xEu (x = 0.020 and 0.025) phosphor powders with color coordinates of x = 0.368, y = 0.378 and x = 0.376, y = 0.366, respectively.

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“…It may transfer its excitation energy to the resonant energy levels of other REs (e.g. Er 3+ , Tm 3+ , Pr 3+ , Tb 3+ and Ho 3+ ) and act as a sensitizer [19][20][21]. Thus, Yb 3+ ions are used as co-dopant with other REs for efficient UC luminescence.…”

Section: Introductionmentioning

confidence: 99%

Development of inorganic-organic hybrid nanostructured material for H₂O₂ sensing application

Kumar

Shahi

Bahadur

et al. 2020

Mater. Res. Express

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An organic-inorganic hybrid nanoparticle (HNPs) composed of Sm(TTA) 3 Phen, a coordination compound, and NaY 0.78 Er 0.02 Yb 0.20 F 4, an upconversion nanoparticles (UCNPs), has been developed and used for H 2 O 2 sensing application. Herein, Sm(TTA) 3 Phen absorbs ultraviolet (UV) light and gives fluorescence in yellow-red-near infrared (NIR) region. Whereas, the UCNPs absorb NIR radiations (980 nm) and consequently emit in green-red region through photon upconversion process. Two important optical phenomena are observed when HNPs are simultaneously excited with UV (266 nm) and NIR (980 nm) laser radiation-(i) an energy transfer from Sm 3+ to Er 3+ ions, and (ii) color tunable emission from red to green, if the power of 980 nm laser is varied. Further, the material is highly competent to sense H 2 O 2 through fluorescence quenching of Sm 3+ emission in presence of H 2 O 2 . The nature of quenching is conspicuously different for different concentration/ volume range of H 2 O 2 . For lower volume range, the rate of decrease of emission/excitation intensity is linear, while for higher volume range the decay in intensity is exponential. The attained minimum detection limit for H 2 O 2 is 2 μl, which is significant for sensing applications.

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Enhancement of luminescence emission from GdVO4:Er3+/Yb3+ phosphor by Li+ co-doping

Cited by 36 publications

References 42 publications

Morphology of the GdVO₄crystal: first-principles studies

Morphology of the GdVO₄crystal: first-principles studies

Tunable emission from LiBaBO₃:Eu³⁺;Bi³⁺ phosphor for solid‐state lighting

Development of inorganic-organic hybrid nanostructured material for H₂O₂ sensing application

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Enhancement of luminescence emission from GdVO4:Er3+/Yb3+ phosphor by Li+ co-doping

Cited by 36 publications

References 42 publications

Morphology of the GdVO4crystal: first-principles studies

Morphology of the GdVO4crystal: first-principles studies

Tunable emission from LiBaBO3:Eu3+;Bi3+ phosphor for solid‐state lighting

Development of inorganic-organic hybrid nanostructured material for H2O2 sensing application

Contact Info

Product

Resources

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Morphology of the GdVO₄crystal: first-principles studies

Morphology of the GdVO₄crystal: first-principles studies

Tunable emission from LiBaBO₃:Eu³⁺;Bi³⁺ phosphor for solid‐state lighting

Development of inorganic-organic hybrid nanostructured material for H₂O₂ sensing application