Comparative study on luminescent properties of LiLa2BO5:Eu3+ phosphors synthesized with different methods

Haque, M. M.; Asraf, Md. Ali; Hossen, Md. Faruk; Hossan, Md. Shamim; Kim, Dong-Kuk; Lee, Hong-In

doi:10.1016/j.jallcom.2012.05.058

Cited by 25 publications

(4 citation statements)

References 39 publications

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“…Additionally, in other kinds of hosts especially phosphates, silicates, etc. for example, K 5 Y(P 2 O 7 ) 2 :Eu 3+ ,YBa 3 (PO 4 ) 3 :Eu 3+ , Na 3 MgZr(PO 4 ) 3 :Eu 3+ , RbBaPO 4 :Eu 3+ , KCaR(PO 4 ) 2 (R = Gd and Y):Eu 3+ , Ca 19 Mg 2 (PO 4 ) 14 :Eu 3+ , YPO 4 :Eu 3+ , Ca 2 Ga 2 SiO 7 :Eu 3+ , MgY 4 Si 3 O 13 :Eu 3+ , α-Y 2 Si 2 O 7 :Eu 3+ , Y 4.67 (SiO 4 ) 3 O: Eu 3+ , Ca 3 Te 2 (ZnO 4 ) 3 :Eu 3+ , europium oxalate [Eu 2 (C 2 O 4 ) 3 (H 2 O) 6 ]·4.34H 2 O} n , Sr 2 MgB 2 O 6 :Eu 3+ , La 2 CaB 8 O 16 :Eu 3+ , LiLa 2 BO 5 :Eu 3+ , LiCaBO 3 :Eu 3+ , and SrAl 2 B 2 O 7 :Eu 3+ , a similar kind of phenomenon has been reported. − In spite of so many reports, there have been only few attempts to rationalize this phenomenon. Xin and co-workers attributed this abnormality to induced effective positive charge on europium in YBa 3 (PO 4 ) 3 lattice.…”

Section: Introductionmentioning

confidence: 99%

Why Do Relative Intensities of Charge Transfer and Intra-4f Transitions of Eu³⁺ Ion Invert in Yttrium Germanate Hosts? Unravelling the Underlying Intricacies from Experimental and Theoretical Investigations

et al. 2020

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The dominant intensity of parity-forbidden intra-4f transitions of europium(III) over O → Eu charge-transfer band (CTB) intensity is against common perceptions, yet this trend is observed in many germanate hosts and has not been rationalized so far. In search of a plausible explanation for this unusual trend, present work reports an experimental and theoretical investigations in conjunction on two sibling germanate host, namely, Y 2 GeO 5 and Y 2 Ge 2 O 7 having dopant Eu 3+ in their respective YO 7 polyhedra. Whereas for Y 2 GeO 5 :Eu 3+ , the CTB is more intense than the intra-4f transitions in the excitation spectrum, in the case of Y 2 Ge 2 O 7 :Eu 3+ , the relative intensities of CTB and intra-4f transitions are reversed. Comparative structural analysis reveals that Eu 3+ present in YO 7 of Y 2 GeO 5 has a greater number of tetra-coordinated oxygen (O tetra ) and yttrium atom as first and second neighbors, respectively (Eu 3+ −O tetra −Y 3+ linkages). Conversely, in Y 2 Ge 2 O 7 host, the Eu 3+ ion mostly has tricoordinated oxygen (O tri ) as its nearest neighbor and germanium ions next to O tri (Eu 3+ −O tri −Ge 4+ linkage). Theoretical calculations reveal that while Y 2 GeO 5 :Eu has O tetra (4Y) dominating at the Fermi level and the 4f state of Eu 3+ remains inert toward mixing, in Y 2 Ge 2 O 7 :Eu, the Fermi level has major contribution from O tri (2Y + 1Ge) with significant mixing with 4f states of Eu. The dominant control of Eu 3+ −O tri −Ge 4+ linkages in geometrical and electronic structure of Y 2 Ge 2 O 7 :Eu owing to the GeO 4 surrounding has been attributed to relative poor intensity of O → Eu CTB. Siege of Eu 3+ by GeO 4 and subsequent occurrence of Eu 3+ −O tri −Ge 4+ linkages play a dual role: First, it induces electronic rigidity to hinder excitation of electron at bridging (O tri ) oxygen by highly charged small Ge 4+ cation; second, the covalent character in Eu−O bond is achieved by intermixing of Eu's 4f and O tri 2p orbital which facilitates relaxing of the parity-selection rule thus enhancing the probability of intra-4f transitions. The inferences drawn remain valid when extrapolated to other inorganic oxides having EuO x polyhedra surrounded by covalent units like PO 4 , SiO 4 , etc. and have a prevailing number of low-coordinated oxygen atoms and highly charged small cation in the first and second coordination shells, respectively. The optical basicity concept is also found to endorse our explanation. These remarkable generic inferences will pave the rational way for designing efficient phosphors for solidstate lighting.

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Section: Introductionmentioning

confidence: 99%

Why Do Relative Intensities of Charge Transfer and Intra-4f Transitions of Eu³⁺ Ion Invert in Yttrium Germanate Hosts? Unravelling the Underlying Intricacies from Experimental and Theoretical Investigations

et al. 2020

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“…Borates are always attracting a great interest among functional materials because of their rich varieties in crystal structure, large band gap, low synthesis temperature, and environmental benignity (Heller, 1986; Xue et al ., 2000; Gravereau et al ., 2002; Yang and Dolg, 2006; Zhao et al ., 2012; Lou et al ., 2015a, 2015b). There are lots of borates discovered with outstanding chemical and physical properties, such as, BBO ( β -BaB 2 O 4 ), LBO (LiB 3 O 5 ) (Kellner et al ., 1997), and CBO (CsB 3 O 5 ) (Wu et al ., 1993) for second-harmonic generation or Li 6 GdB 3 O 9 , Ca 3 Y(GaO) 3 (BO 3 ) 4 , KSr 4 B 3 O 9 , YCa 4 O(BO 3 ) 3 , LiLa 2 BO 5 , and GdB 5 O 9 for promising host of phosphor (Jubera et al ., 2003; Huang and Chen, 2011; Haque et al ., 2012; Wu et al ., 2012; Ingle et al ., 2014; Sun et al ., 2015), and the M 3 BO 5 (M = Co, Fe) ludwigite family as magnetic materials (Bordet and Suard, 2009; Norrestam et al ., 1989).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, crystal structure, and thermal stability of new borates Na₃REB₂O₆(RE = Pr, Sm, Eu)

Wang

Cai

et al. 2016

Powder Diffr.

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Subsolidus phase equilibrium of Na2O–Sm2O3–B2O3 system has been investigated mainly by solid-state reaction and powder X-ray diffraction method. There are nine definite three-phase regions and three ternary compounds determined under present experimental conditions. A novel compound Na3SmB2O6 was found and confirmed in this system, along with its two homogeneous compounds Na3REB2O6 (RE = Pr, Eu) synthesized for the first time. The indexing results showed that all three compounds crystallize in the monoclinic space group P21/c (No.14) with the same structure type as both Na3NdB2O6 and Na3GdB2O6. The lattice parameters (a, b, and c) of new borates Na3REB2O6 (RE = Pr, Sm, Eu) decrease linearly with a decreasing radius of RE ion, which obeys the Lanthanide-contraction rule. The existence of a trigonal BO3 group in the Na3REB2O6 (RE = Pr, Sm) compounds was confirmed by analysis of their infrared absorption spectra. Thermal stabilities of the three new borates have been investigated.

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“…Finally, it decayed to two ground‐level states ( 7 F 1 and 7 F 2 ) to yield orange and red photons, which corresponded to the Eu 3+ ions 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 transitions. [ 27–30 ]…”

Section: Resultsmentioning

confidence: 99%

Wet chemical synthesis of BiPO₄:Eu³⁺ phosphor for w‐LED application

Nandanwar¹,

Yerpude²,

Kokode³

et al. 2022

Luminescence

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The synthesis of BiPO 4 :Eu 3+ phosphors has been achieved via a wet chemical process. X-ray diffraction patterns show that the phase of the as-prepared samples matches very well with the standard BiPO 4 structure. At 395 nm, the highest excitation intensity was observed. Following 395 nm excitation, two characteristic emission peaks at 592 nm and 616 nm were shown. At 0.5 mol% of Eu 3+ ions, concentration quenching occurred. The particle size is within the micrometre range, according to the scanning electron microscope magnification. The chromaticity coordinates for wavelengths 592 nm and 616 nm are (x = 0.586, y = 0.412) and (x = 0.682, y = 0.317), respectively. The findings imply that the prepared phosphor may be used to create white light-emitting diodes.

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Comparative study on luminescent properties of LiLa2BO5:Eu3+ phosphors synthesized with different methods

Cited by 25 publications

References 39 publications

Why Do Relative Intensities of Charge Transfer and Intra-4f Transitions of Eu³⁺ Ion Invert in Yttrium Germanate Hosts? Unravelling the Underlying Intricacies from Experimental and Theoretical Investigations

Why Do Relative Intensities of Charge Transfer and Intra-4f Transitions of Eu³⁺ Ion Invert in Yttrium Germanate Hosts? Unravelling the Underlying Intricacies from Experimental and Theoretical Investigations

Synthesis, crystal structure, and thermal stability of new borates Na₃REB₂O₆(RE = Pr, Sm, Eu)

Wet chemical synthesis of BiPO₄:Eu³⁺ phosphor for w‐LED application

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Comparative study on luminescent properties of LiLa2BO5:Eu3+ phosphors synthesized with different methods

Cited by 25 publications

References 39 publications

Why Do Relative Intensities of Charge Transfer and Intra-4f Transitions of Eu3+ Ion Invert in Yttrium Germanate Hosts? Unravelling the Underlying Intricacies from Experimental and Theoretical Investigations

Why Do Relative Intensities of Charge Transfer and Intra-4f Transitions of Eu3+ Ion Invert in Yttrium Germanate Hosts? Unravelling the Underlying Intricacies from Experimental and Theoretical Investigations

Synthesis, crystal structure, and thermal stability of new borates Na3REB2O6(RE = Pr, Sm, Eu)

Wet chemical synthesis of BiPO4:Eu3+ phosphor for w‐LED application

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Why Do Relative Intensities of Charge Transfer and Intra-4f Transitions of Eu³⁺ Ion Invert in Yttrium Germanate Hosts? Unravelling the Underlying Intricacies from Experimental and Theoretical Investigations

Why Do Relative Intensities of Charge Transfer and Intra-4f Transitions of Eu³⁺ Ion Invert in Yttrium Germanate Hosts? Unravelling the Underlying Intricacies from Experimental and Theoretical Investigations

Synthesis, crystal structure, and thermal stability of new borates Na₃REB₂O₆(RE = Pr, Sm, Eu)

Wet chemical synthesis of BiPO₄:Eu³⁺ phosphor for w‐LED application