Improved electroluminescence of ZnS:Mn thin films by codoping with potassium chloride

Waldrip, Karen Elizabeth; Lewis, Jay; Zhai, Q.; Puga-Lambers, M.; Davidson, Mark R.; Holloway, Paul H.; Sun, Sey‐Shing

doi:10.1063/1.1338988

Cited by 21 publications

(8 citation statements)

References 11 publications

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“…The sites offered for Eu 2+ will have more reduced symmetry, which will lift the parity selection rule and increase transition probability of electrons, and then result in an increase of the PL intensity. 31 In addition, the local distortion will be enhanced with the increase of the positive size mismatch between the codopant and the host cation. 32 On the other hand, Mg 2+ located in the interstitial sites and Eu 2+ were separated by Mg 2+ .…”

Section: Resultsmentioning

confidence: 99%

Enhancing the emission intensity and decreasing the full widths at half maximum of Ba₃Si₆O₁₂N₂:Eu²⁺ by Mg²⁺ doping

Wang

Zhao

et al. 2015

Dalton Trans.

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The promising green oxynitride phosphor, Ba3-xMgxSi6O12N2:Eu(2+) was synthesized by the solid-state reaction method. The effect of Mg(2+) doping on the structure and photoluminescence (PL) properties of Ba3Si6O12N2:Eu(2+) was investigated systematically. The results reveal that the phosphor retains the single phase of Ba3Si6O12N2, with the lattice expanding upon increasing the Mg(2+) concentration, in an appropriate range. This suggests that a large portion of Mg(2+) enters into the interstitial sites of the crystal lattice. At a certain concentration, Mg(2+) doping can greatly enhance the absorption and PL intensity and decrease the full widths at half maximum (FWHM) of Ba3Si6O12N2:Eu(2+) phosphors. The green phosphor Ba2.87Eu0.1Mg0.03Si6O12N2 exhibited a small thermal quenching, which remained 82% of the initial emission intensity when measured at 150 °C. The quantum efficiency measured at 400 nm excitation was 38.5%. All the results indicate that the solid solution Ba3-xMgxSi6O12N2:Eu(2+) can be a good candidate for phosphors applicable in n-UV LEDs for solid-state lighting.

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Section: Resultsmentioning

confidence: 99%

Enhancing the emission intensity and decreasing the full widths at half maximum of Ba₃Si₆O₁₂N₂:Eu²⁺ by Mg²⁺ doping

Wang

Zhao

et al. 2015

Dalton Trans.

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“…Thus, the crystal field surrounding the Eu 3+ ions would be altered. The sites offered for Eu 3+ ions will have more reduced symmetry which is able to lift the parity selection rule and increase transition possibility of electron, and then result in an increase of PL intensity [31]. Additionally the local distribution will be enhanced with the increase of the positive size co-dopant and the host cation [32].…”

Section: Resultsmentioning

confidence: 99%

Enhanced photoluminescence of Gd2O3:Eu3+ nanophosphors with alkali (M=Li+, Na+, K+) metal ion co-doping

Dhananjaya

Nagabhushana

et al. 2012

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Gd(1.95)Eu(0.04)M(0.01)O(3) (M=Li(+), Na(+), K(+)) nanophosphors have been synthesized by a low temperature solution combustion (LSC) method. Powder X-ray diffraction pattern (PXRD), scanning electron microscopy (SEM), UV-vis and photoluminescence (PL) measurements were carried out to characterize their structural and luminescent properties. The excitation and emission spectra indicated that the phosphor could be well excited by UV light (243 nm) and emit red light about 612 nm. The effect of alkali co-dopant on PL properties has been examined. The results showed that incorporation of Li(+), Na(+) and K(+) in to Gd(2)O(3):Eu(3+) phosphor would lead to a remarkable increase of photoluminescence. The PL intensity of Gd(2)O(3):Eu(3+) phosphor was improved evidently by co-doping with Li(+) ions whose radius is less than that of Gd(3+) and hardly with Na(+), K(+) whose radius is larger than that of Gd(3+). The effect of co-dopants on enhanced luminescence was mainly regarded as the result of a suitable local distortion of crystal field surrounding the Eu(3+) activator. These results will play an important role in seeking some more effective co-dopants.

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“…Hence, the local symmetry surrounding the Eu 3+ ions would be modified to offer a site with lower symmetry to activator ions. This lower symmetry is able to relax the parity selection rule and increase the transition possibility of electron and also 5 D 0 → 7 F 2 transitions, and hence the enhancement in PL emission intensity [48].…”

Section: Resultsmentioning

confidence: 99%

Alkali metal ion co-doped Eu3+ activated GdPO4 phosphors: Structure and photoluminescence properties

Halappa

Mathur

Delville

et al. 2018

Journal of Alloys and Compounds

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Series of alkali metal ion co-doped with Eu 3+ activated GdPO 4 phosphors were synthesized by the conventional solid state method. Structural parameters were confirmed by the X-ray Rietveld refinement method. All the compounds are crystallized in the monazite phase with space group (P12 1 /n 1 , No.14). Morphology and functional group analysis were performed on scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR).Room temperature photoluminescence (PL) spectroscopic results reveal that, on Eu 3+ ion doping in the GdPO 4 host matrix, the magnetic dipole transition ( 5 D 0 → 7 F 1 ) at 581 nm responsible for orange light, dominates the red emission with respect to the electric dipole transition ( 5 D 0 → 7 F 2 ) at 620 nm. It was found that the emission intensity increased up to 9 mol% of Eu 3+ and then quenched due to multipolar interactions. Further, co-doping with Li + , Na + and K + ion in to Eu 3+ activated GdPO 4 phosphor led to an enhancement in luminescence intensity by reducing the parity restriction of electric dipole transitions as a consequence of suitable local distortion of the crystal field surrounding the Eu 3+ activator ion. The results of Judd-Ofelt theory and radiative parameters suggest that these phosphors have a short lifetime, good quantum efficiency, excellent color purity compared to other reported Eu 3+ doped phosphors. These results illustrate the mechanistic effect of alkali metal ions doping on luminescent properties of rare earth ion doped GdPO 4 phosphors and help in optimization of their luminescent properties according to the practical requirements in optoelectronic and biomedical applications.

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Improved electroluminescence of ZnS:Mn thin films by codoping with potassium chloride

Cited by 21 publications

References 11 publications

Enhancing the emission intensity and decreasing the full widths at half maximum of Ba₃Si₆O₁₂N₂:Eu²⁺ by Mg²⁺ doping

Enhancing the emission intensity and decreasing the full widths at half maximum of Ba₃Si₆O₁₂N₂:Eu²⁺ by Mg²⁺ doping

Enhanced photoluminescence of Gd2O3:Eu3+ nanophosphors with alkali (M=Li+, Na+, K+) metal ion co-doping

Alkali metal ion co-doped Eu3+ activated GdPO4 phosphors: Structure and photoluminescence properties

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Improved electroluminescence of ZnS:Mn thin films by codoping with potassium chloride

Cited by 21 publications

References 11 publications

Enhancing the emission intensity and decreasing the full widths at half maximum of Ba3Si6O12N2:Eu2+ by Mg2+ doping

Enhancing the emission intensity and decreasing the full widths at half maximum of Ba3Si6O12N2:Eu2+ by Mg2+ doping

Enhanced photoluminescence of Gd2O3:Eu3+ nanophosphors with alkali (M=Li+, Na+, K+) metal ion co-doping

Alkali metal ion co-doped Eu3+ activated GdPO4 phosphors: Structure and photoluminescence properties

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Enhancing the emission intensity and decreasing the full widths at half maximum of Ba₃Si₆O₁₂N₂:Eu²⁺ by Mg²⁺ doping

Enhancing the emission intensity and decreasing the full widths at half maximum of Ba₃Si₆O₁₂N₂:Eu²⁺ by Mg²⁺ doping