Domination of Second-Sphere Shrinkage Effect To Improve Photoluminescence of Red Nitride Phosphors

Huang, Wan-Yu; Yoshimura, Fumitaka; Ueda, Kyota; Pang, Wei Kong; Su, Bing‐Jian; Jang, Ling‐Yun; Chiang, Cheng-Yen; Zhou, Wuzong; Duy, Nguyen Hoang; Liu, Ru‐Shi

doi:10.1021/ic5017752

Cited by 24 publications

(26 citation statements)

References 33 publications

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“…The increased thermal stability is attributable to the partial substitution of Eu–O (Eu–N) bonds by more covalent Eu–B ones that leads to a higher structural rigidity, which has already been observed in carbon-doped nitride phosphors [40,41,42]. Therefore, using nano-EuB 6 as a raw material in nitride luminescence materials can improve the luminescence performance as well as the thermal stability.…”

Section: Resultsmentioning

confidence: 97%

The Enhanced Red Emission and Improved Thermal Stability of CaAlSiN3:Eu2+ Phosphors by Using Nano-EuB6 as Raw Material

Liu

Chang

et al. 2018

Nanomaterials

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Synthesizing phosphors with high performance is still a necessary work for phosphor-converted white light-emitting diodes (W-LEDs). In this paper, three series of CaAlSiN3:Eu2+ (denoted as CASN:Eu2+) phosphors using Eu2O3, EuN and EuB6 as raw materials respectively are fabricated by under the alloy precursor normal pressure nitridation synthesis condition. We demonstrate that CASN:Eu2+ using nano-EuB6 as raw material shows higher emission intensity than others, which is ascribed to the increment of Eu2+ ionic content entering into the crystal lattice. An improved thermal stability can also be obtained by using nano-EuB6 due to the structurally stable status, which is assigned to the partial substitution of Eu–O (Eu–N) bonds by more covalent Eu–B ones that leads to a higher structural rigidity. In addition, the W-LEDs lamp was fabricated to explore its possible application in W-LEDs based on blue LEDs. Our results indicate that using EuB6 as raw materials can provide an effective way of enhancing the red emission and improving the thermal stability of the CASN:Eu2+ red phosphor.

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Section: Resultsmentioning

confidence: 97%

The Enhanced Red Emission and Improved Thermal Stability of CaAlSiN3:Eu2+ Phosphors by Using Nano-EuB6 as Raw Material

Liu

Chang

et al. 2018

Nanomaterials

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“…Huang et al used the substitution of smaller Si 4+ for larger Al 3+ of the CaAlSiN 3 :Eu 2+ phosphor lattice to achieve an excellent thermal stability, owing to the second-sphere shrinkage. 16 Moreover, the solid solution strategy is a usual method to modify the luminescence properties of phosphors. Li et al introduced isostructural Si 2 N 2 O into CaAlSiN 3 lattice to form solid solutions of Ca 1-x Al 1 − x Si 1 + x N 3 − x O x .…”

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confidence: 99%

Enhanced thermal quenching characteristic via carbon doping in red‐emitting CaAlSiN₃:Eu²⁺ phosphors

et al. 2019

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Enhancing thermal quenching characteristic of phosphor for use in high power white‐light‐emitting diodes (wLEDs) is a significant materials challenge. To achieve this goal, a series of red‐emitting carbidonitride phosphors Ca0.992AlSiN3 − 4/3xCx:0.008Eu2+ have been synthesized by high‐temperature solid‐state reaction method. Crystal structure, luminescence properties, and thermal quenching process are investigated. The location of carbon in the lattice is proved by the Raman spectra. The preferential crystallographic site of carbon is validated by the first‐principles density functional theory calculations combining the Rietveld refinement. With carbon doping from x = 0 to x = 0.24, the emission spectra are blue‐shifted from 656.8 to 650.2 nm, and the fitted lifetime of Eu2+ decreases from 775.3 to 721.7 ns. Replacing nitrogen by carbon enhances thermal quenching characteristic by 8.9% at 300°C. Carbon doping enlarges the thermal ionization energy barriers (EdC) which is calculated at great length, and suppresses thermal ionization process. A wLED fabricated by the combination of a blue chip with the as‐synthesized red phosphor and LuAG: Ce3+ green phosphor shows a high color rendering indexes (Ra = 95.9 and R9 = 92). The promising application of Ca0.992AlSiN3 − 4/3xCx:0.008Eu2+ phosphor for wLEDs is proved by all results above.

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“…White light LED lighting is expected to become the major lighting technique in the next generation due to its advantages such as energy efficiency, long lifetime, compactness, environment friendliness and designable features [1,2]. Currently, white LED lighting devices are mostly fabricated based on the combination of an InGaN-based blue-LED chip and a yellow-emitting phosphor, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…It is known that Eu 2+ doped CaAlSiN 3 phosphor (simply referred to as CASIN hereafter), Eu 2+ is incorporated into the host lattice at the Ca 2+ sites ( i.e ., by substituting for Ca 2+ ) [1,2]. Suehiro et al .…”

Section: Introductionmentioning

confidence: 99%

Effects of Ca Content on Formation and Photoluminescence Properties of CaAlSiN3:Eu2+ Phosphor by Combustion Synthesis

Chung

Huang

2016

Materials

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Effects of Ca content (in the reactant mixture) on the formation and the photoluminescence properties of CaAlSiN3:Eu2+ phosphor (CASIN) were investigated by a combustion synthesis method. Ca, Al, Si, Eu2O3, NaN3, NH4Cl and Si3N4 powders were used as the starting materials and they were mixed and pressed into a compact which was then wrapped up with an igniting agent (i.e., Mg + Fe3O4). The compact was ignited by electrical heating under a N2 pressure of ≤1.0 MPa. By keeping the molar ratios of Al and Si (including the Si powder and the Si in Si3N4 powder) both at 1.00 and that of Eu2O3 at 0.02, XRD (X-ray diffraction) coupled with TEM-EDS (transmission electron microscope equipped with an energy-dispersive X-ray spectroscope) and SAED (selected area electron diffraction) measurements show that AlN:Eu2+ and Ca-α-SiAlON:Eu2+ are formed as the major phosphor products when the Ca molar ratio (denoted by Y) is equal to 0.25 and AlN:Eu2+ and Ca-α-SiAlON:Eu2+ could not be detected at Y ≥ 0.75 and ≥1.00, respectively. CASIN (i.e., CaAlSiN3:Eu2+) becomes the only phosphor product as Y is increased to 1.00 and higher. The extent of formation of CASIN increases with increasing Y up to 1.50 and begins to decrease as Y is further increased to 1.68. While the excitation wavelength regions are similar at various Y, the emission wavelength regions vary significantly as Y is increased from 0.25 to 1.00 due to different combinations of phosphor phases formed at different Y. The emission intensity of CASIN was found to vary with Y in a similar trend to its extent of formation. The Ca and Eu contents (expressed as molar ratios) in the synthesized products were found to increase roughly with increasing Y but were both lower than the respective Ca and Eu contents in the reactant mixtures.

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Domination of Second-Sphere Shrinkage Effect To Improve Photoluminescence of Red Nitride Phosphors

Cited by 24 publications

References 33 publications

The Enhanced Red Emission and Improved Thermal Stability of CaAlSiN3:Eu2+ Phosphors by Using Nano-EuB6 as Raw Material

The Enhanced Red Emission and Improved Thermal Stability of CaAlSiN3:Eu2+ Phosphors by Using Nano-EuB6 as Raw Material

Enhanced thermal quenching characteristic via carbon doping in red‐emitting CaAlSiN₃:Eu²⁺ phosphors

Effects of Ca Content on Formation and Photoluminescence Properties of CaAlSiN3:Eu2+ Phosphor by Combustion Synthesis

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Domination of Second-Sphere Shrinkage Effect To Improve Photoluminescence of Red Nitride Phosphors

Cited by 24 publications

References 33 publications

The Enhanced Red Emission and Improved Thermal Stability of CaAlSiN3:Eu2+ Phosphors by Using Nano-EuB6 as Raw Material

The Enhanced Red Emission and Improved Thermal Stability of CaAlSiN3:Eu2+ Phosphors by Using Nano-EuB6 as Raw Material

Enhanced thermal quenching characteristic via carbon doping in red‐emitting CaAlSiN3:Eu2+ phosphors

Effects of Ca Content on Formation and Photoluminescence Properties of CaAlSiN3:Eu2+ Phosphor by Combustion Synthesis

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Enhanced thermal quenching characteristic via carbon doping in red‐emitting CaAlSiN₃:Eu²⁺ phosphors