First principles analysis of the MgAl2O4:Ni2+ absorption spectrum

Brik, M.G.

doi:10.1016/j.jlumin.2006.02.004

Cited by 10 publications

(2 citation statements)

References 22 publications

(32 reference statements)

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“…They remain of particular interest for the study of fundamental and application aspects in the nanostructured topography approach. In the spectroscopic investigations of the complex alloys, including the crystals [5][6][7], particular interest is present on Ni ions due to substantially different configuration of the localised d-orbitals. By and large, galvanostatic method is the more common deposition technique for this kind of film's growth study particularly when there is a change of thickness parameter.…”

Section: Introductionmentioning

confidence: 99%

Role of substrate on topography features of nickel deposited nanostructures

Nzoghe-Mendome

Ebothé

Al-Oufy

et al. 2008

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Role of substrate on topography features of nickel deposited nanostructures

Nzoghe-Mendome

Ebothé

Al-Oufy

et al. 2008

Journal of Alloys and Compounds

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“…The spinel crystals ͑MgAl 2 O 4 ͒ doped with transition metal ions such as Ni 2+ , Cr 3+ , Co 3+ , and Mn 2+ have been studied by various groups. [3][4][5][6] Meanwhile, MgAl 2 O 4 phosphors doped with rare-earth metal ions have also emerged as materials with great potential. 7 For example, Ce-doped MgAl 2 O 4 phosphors were prepared at 1350°C by the solid-state reaction method, using MgO, Al 2 O 3 , and Ce 2 ͑CO 3 ͒ 3 ·5H 2 O as the raw materials.…”

mentioning

confidence: 99%

Characterization and Luminescence Properties of Blue Emitting Phosphor (Mg,Sr)Al[sub 2]O[sub 4]:Eu[sup 2+] for White LEDs

Cui

Jiang

et al. 2010

J. Electrochem. Soc.

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Mg 1−x−y Sr y Al 2 O 4 :Eu x 2+ blue phosphor particles for white light-emitting diodes ͑LEDs͒ were prepared by a solid-state reaction method, and their luminescent properties were investigated with the change in the concentration of the activator and the composition of the host matrix. The phosphor particles were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, and fluorescence spectrophotometer. The luminescence of Eu 2+ -activated MgAl 2 O 4 has shown a strong blue emission dominant peak around 460 nm, and the highest intensity was observed when the content of Eu 2+ was 2 mol %. The substitution of 1-10% Sr 2+ ions instead of the Mg 2+ greatly enhanced the 460 nm blue emissions, especially for samples excited by UV in the range of 350-400 nm. The optimized phosphor Mg 0.92 Sr 0.06 Al 2 O 4 :Eu 0.02 2+ has shown 10 times emission intensity compared with that of the Mg 0.98 Al 2 O 4 :Eu 0.02 2+ phosphor when they were excited by a 365 nm UV light. The luminescent properties of Mg 1−x−y Sr y Al 2 O 4 :Eu x 2+ were investigated by changing the ratio of Sr 2+ to Mg 2+ . For Sr 2+ -doped MgAl 2 O 4 :Eu 2+, the photoluminescence increased by about 6%. The mechanism for the improvement was discussed. No obvious degradation problem of the synthesized Sr 2+ -doped samples due to the moisture in the laboratory atmosphere could be found.White light-emitting diodes ͑LEDs͒, the next-generation solidstate lighting, have attracted much attention due to their superior features such as quite a low power consumption, high efficiency, small volume, low maintenance, and being mercury-free. White LEDs have been widely used as backlights for electronic devices and are anticipated to replace traditional fluorescent lamps for general illumination as their efficiency and color-rendering properties are significantly improved. The most common white LED is obtained by combining a blue InGaN chip with a yellow cerium-doped yttrium aluminum garnet. 1 However, this type of white light has a low color-rendering index and no full range of visible light. This drawback limits the expansion of the LED application. Thus, phosphor materials with improved properties are greatly in demand.In recent years, MgAl 2 O 4 phosphors have brought great promise for their potential applications due to their mechanical strength, high resistance to chemical attacks, and excellent dielectric and optical properties. 2 Consequently, considerable efforts have been made to fabricate the MgAl 2 O 4 phosphors doped with transition-metal ions. The spinel crystals ͑MgAl 2 O 4 ͒ doped with transition metal ions such as Ni 2+ , Cr 3+ , Co 3+ , and Mn 2+ have been studied by various groups. 3-6 Meanwhile, MgAl 2 O 4 phosphors doped with rare-earth metal ions have also emerged as materials with great potential. 7 For example, Ce-doped MgAl 2 O 4 phosphors were prepared at 1350°C by the solid-state reaction method, using MgO, Al 2 O 3 , and Ce 2 ͑CO 3 ͒ 3 ·5H 2 O as the raw materials. 8 Red-emitting MgAl 2 O 4 :Eu 3+ phosphor...

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Analysis of optical spectra of V²⁺ centres in ZnS and ZnSe single crystals

Brik

Kityk

2008

Physica Status Solidi (b)

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A systematic spectroscopic study of V2+‐doped ZnS and ZnSe single crystals (which includes crystal growth, absorption spectra measurements and combined application of the crystal field calculations and first‐principles analysis of V2+ energy levels and absorption spectra) is reported. Detailed comparison between the calculated energy levels and experimental absorption spectra enabled the assignment of the absorption peaks. The dependence of the crystal field and covalent effects on the interionic distance is analysed qualitatively. Several existing discrepancies between various literature data concerning the order of the V2+ energy levels (in particular, the positions of the 2E and 4T1 (4P) levels) are resolved. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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First principles analysis of the MgAl2O4:Ni2+ absorption spectrum

Cited by 10 publications

References 22 publications

Role of substrate on topography features of nickel deposited nanostructures

Role of substrate on topography features of nickel deposited nanostructures

Characterization and Luminescence Properties of Blue Emitting Phosphor (Mg,Sr)Al[sub 2]O[sub 4]:Eu[sup 2+] for White LEDs

Analysis of optical spectra of V²⁺ centres in ZnS and ZnSe single crystals

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First principles analysis of the MgAl2O4:Ni2+ absorption spectrum

Cited by 10 publications

References 22 publications

Role of substrate on topography features of nickel deposited nanostructures

Role of substrate on topography features of nickel deposited nanostructures

Characterization and Luminescence Properties of Blue Emitting Phosphor (Mg,Sr)Al[sub 2]O[sub 4]:Eu[sup 2+] for White LEDs

Analysis of optical spectra of V2+ centres in ZnS and ZnSe single crystals

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Product

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Analysis of optical spectra of V²⁺ centres in ZnS and ZnSe single crystals