Optical Properties of Rare Earth Doped SrS Phosphor: A Review

Khare, Ayush; Mishra, Sakshi; Kshatri, D.S.; Tiwari, Sanjay

doi:10.1007/s11664-016-4988-1

Cited by 15 publications

(7 citation statements)

References 89 publications

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“…Samples of La2Mo2O9 and La1.98Bi0.02Mo2O9 (1), and La2MoO6 and La1.98Bi0.02MoO9 (2) were prepared from stoichiometric amounts of La(OH)3, MoO3 and Bi2O3 previously decarbonated at 600°C in air. The reactants were thoroughly mixed and ground together, placed in an alumina crucible and fired at 600°C during 12h.…”

Section: Synthesis Of Samplesmentioning

confidence: 99%

“…The reactants were thoroughly mixed and ground together, placed in an alumina crucible and fired at 600°C during 12h. Then, the samples were heated at 1000°C during 12h for (1) and 700°C during 12h for (2), respectively. The purity of all samples was further checked by powder X-Ray diffraction (PXRD).…”

Section: Synthesis Of Samplesmentioning

confidence: 99%

“…Most commercialized WLEDs consist today of (In,Ga)N based blue LED chip combined with a yellow phosphor (typically (Y,Gd)3Al5O12:Ce) blended with a red-emitting phosphor (typically Eu 2+ -doped nitrides or sulfides) to reach the appropriate values of color rendering index for the domestic market. [1][2][3] However, the controversies associated with the possible harmfulness of the blue component, often too intense, that may trigger photochemical damages to the retina and the crystalline lens, are pushing the lighting industry to develop alternatives. Among them, technologies based on the use of a UV-LED chip such as (In,Ga)(P,N) in association with three phosphors (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, many studies focus on LEDs (light-emitting diodes) and especially on white LEDs (WLEDs) to produce at low price a comfortable light (i.e.,, a warm light). Most commercialized WLEDs consist of an (In,Ga)N-based blue LED chip combined with a yellow phosphor (typically (Y,Gd) 3 Al 5 O 12 :Ce) blended with a red-emitting phosphor (typically Eu 2+ -doped nitrides or sulfides) to reach the appropriate values of the color-rendering index for the domestic market. − However, the controversies associated with the possible harmfulness of the blue component, often too intense, that may trigger photochemical damage to the retina and the crystalline lens are pushing the lighting industry to develop alternatives. Among them, technologies based on the use of a UV-LED chip such as (In,Ga)(P,N) in association with three phosphors (e.g., Y 2 O 2 S:Eu or SrS:Eu or Sr 2 Si 5 N 8 :Eu, SrGa 2 S 4 :Eu and BaMgAl 10 O 17 :Eu for red, green, and blue, respectively) look particularly attractive .…”

Section: Introductionmentioning

confidence: 99%

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Origin of Luminescence in La₂MoO₆ and La₂Mo₂O₉ and Their Bi-Doped Variants

et al. 2020

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In this paper, lanthanum molybdenum oxides (La2MoO6 and La2Mo2O9) and their Bi-doped derivatives were investigated as potential rare-earth-free phosphors. An X-Ray diffraction analysis coupled with an EDX study confirmed the purity of the samples and the insertion of bismuth in 1 molar % amount. Kubelka-Munk transformed reflectance spectra clearly indicated that the insertion of Bi induces a shortening of the optical gap in La2MoO6 but has no impact on the one of La2Mo2O9. Moreover, excitation and emission spectra evidenced a strong temperature quenching effect in all materials. Also the CIEx,y parameters at 77K are almost identical with or without Bi-doping for the two host lattices. Clearly, it was shown, combining experimental data, abinitio calculations and empirical positioning of absorption bands that luminescence of Bi-doped La2MoO6 sample is mainly related to the host lattice itself and distortions induced by La/Bi substitution. The role of the Bi 3+ dopant is indirect and the luminescence is mainly due to a MoO charge transfer rather than an on-site Bi 3+ 3 P1,0  1 S0 transition. Concerning La2Mo2O9, there is no effect following the insertion of Bi implying that the role of Bi is insignificant.  ASSOCIATED CONTENT Supporting Information The Supporting Information is available free of charge on the ACS Publications website xxxx at DOI: xxxx. Materials preparation, characterization methods, computational details, Rietveld refinements and EDS analysis.

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Section: Synthesis Of Samplesmentioning

confidence: 99%

Section: Synthesis Of Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Origin of Luminescence in La₂MoO₆ and La₂Mo₂O₉ and Their Bi-Doped Variants

et al. 2020

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“…REM (such as, ceria and lanthana)-based compounds are receiving increasing attention due to their automotive exhaust catalyst applications, high oxygen storage capacity and larger ionic size [1][2][3], which result in a significant enhancement of the catalyst performances. A major application of REMs is remarked in the luminescent materials, such as phosphors [4][5][6][7]. REMs can also be used as additives in cast metals to improve their microstructures and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Gadolinium on the Microstructures and Charpy Impact Properties of Super Duplex Stainless Steels

Moon

Lee

Kim

et al. 2018

Metals

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Super duplex stainless steels (SDSSs), exhibiting excellent strength and corrosion resistance, serve as the attractive materials in a variety of industries. However, improvements in their ductility and impact-toughness are required in extreme environments. In this study, the effects of gadolinium on the microstructures and Charpy impact properties of super duplex stainless steels were investigated. A base super duplex stainless steel (BDSS) and a gadolinium-added super duplex stainless steel (GDSS) were successfully fabricated using an air casting method. The oxygen content and grain size of SDSSs were found to decrease because of high reactivity of gadolinium with oxygen. Moreover, the average inclusion size and area of GDSS also decreased even with a slight decrease in the average distance between inclusions. Both the BDSS and GDSS exhibited typical Charpy impact transition behavior from −196 • C to 200 • C. Moreover, the GDSS impact energies using Charpy test were higher than those of BDSS over the entire temperature range. Moreover, the ductile-to-brittle transition temperature (DBTT) of SDSSs calculated from the fracture appearance transition temperature (FATT) significantly decreased by over 20 • C with the addition of gadolinium.

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