Structure, luminescence and thermal quenching properties of Eu doped Sr2−xBaxSi5N8 red phosphors

Liu, Y.H.; Chen, L.; Zhou, Xiaofang; Liu, R.H.; Zhuang, Weidong

doi:10.1016/j.jssc.2016.11.009

Cited by 13 publications

(3 citation statements)

References 21 publications

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“…When Ba is incorporated into Sr 2 Si 5 N 8 :Eu 2+ , a blueshift of emission from 610 nm ( x = 1) to 585 nm ( x = 2) in Sr 2– x Ba x Si 5 N 8 :Eu 2+ is observed. The Ba substitution leads to the enlargement of the coordination polyhedra as the result of lattice expansion, and thus the blueshift occurs …”

Section: Structure-related Luminescence and Spectral Tuning Of Down-c...mentioning

confidence: 99%

Down-Conversion Nitride Materials for Solid State Lighting: Recent Advances and Perspectives

et al. 2018

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Advances in solid state white lighting technologies witness the explosive development of phosphor materials (down-conversion luminescent materials). A large amount of evidence has demonstrated the revolutionary role of the emerging nitride phosphors in producing superior white light-emitting diodes for lighting and display applications. The structural and compositional versatility together with the unique local coordination environments enable nitride materials to have compelling luminescent properties such as abundant emission colors, controllable photoluminescence spectra, high conversion efficiency, and small thermal quenching/degradation. Here, we summarize the state-of-art progress on this novel family of luminescent materials and discuss the topics of materials discovery, crystal chemistry, structure-related luminescence, temperature-dependent luminescence, and spectral tailoring. We also overview different types of nitride phosphors and their applications in solid state lighting, including general illumination, backlighting, and laser-driven lighting. Finally, the challenges and outlooks in this type of promising down-conversion materials are highlighted.

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Section: Structure-related Luminescence and Spectral Tuning Of Down-c...mentioning

confidence: 99%

Down-Conversion Nitride Materials for Solid State Lighting: Recent Advances and Perspectives

et al. 2018

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“…Red fluorescent materials are essential parts of improving the color rendering index in phosphor-converted WLEDs (pc-WLEDs) and have high application value. With rareearth ions as activating ions, as a representative of the matrix of red phosphors, Sr 2 Si 5 N 8 alkaline earth metal silicon nitride has been extensively studied in recent years [1][2][3]. When Eu 2+ is used as the activating ion, the luminous intensity is the highest.…”

Section: Introductionmentioning

confidence: 99%

Research on Molecular Structure and Electronic Properties of Ln3+ (Ce3+, Tb3+, Pr3+)/Li+ and Eu2+ Co-Doped Sr2Si5N8 via DFT Calculation

Yin

Zhang

et al. 2021

Molecules

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We use density functional theory (DFT) to study the molecular structure and electronic band structure of Sr2Si5N8:Eu2+ doped with trivalent lanthanides (Ln3+ = Ce3+, Tb3+, Pr3+). Li+ was used as a charge compensator for the charge imbalance caused by the partial replacement of Sr2+ by Ln3+. The doping of Ln lanthanide atom causes the structure of Sr2Si5N8 lattice to shrink due to the smaller atomic radius of Ln3+ and Li+ compared to Sr2+. The doped structure’s formation energy indicates that the formation energy of Li+, which is used to compensate for the charge imbalance, is the lowest when the Sr2 site is doped. Thus, a suitable Li+ doping site for double-doped lanthanide ions can be provided. In Sr2Si5N8:Eu2+, the doped Ce3+ can occupy partly the site of Sr12+ ([SrN8]), while Eu2+ accounts for Sr12+ and Sr22+ ([SrN10]). When the Pr3+ ion is selected as the dopant in Sr2Si5N8:Eu2+, Pr3+ and Eu2+ would replace Sr22+ simultaneously. In this theoretical model, the replacement of Sr2+ by Tb3+ cannot exist reasonably. For the electronic structure, the energy level of Sr2Si5N8:Eu2+/Li+ doped with Ce3+ and Pr3+ appears at the bottom of the conduction band or in the forbidden band, which reduces the energy bandgap of Sr2Si5N8. We use DFT+U to adjust the lanthanide ion 4f energy level. The adjusted 4f-CBM of CeSr1LiSr1-Sr2Si5N8 is from 2.42 to 2.85 eV. The energy range of 4f-CBM in PrSr1LiSr1-Sr2Si5N8 is 2.75–2.99 eV and its peak is 2.90 eV; the addition of Ce3+ in EuSr1CeSr1LiSr1 made the 4f energy level of Eu2+ blue shift. The addition of Pr3+ in EuSr2PrSr2LiSr1 makes part of the Eu2+ 4f energy level blue shift. Eu2+ 4f energy level in EuSr2CeSr1LiSr1 is not in the forbidden band, so Eu2+ is not used as the emission center.

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“…[13][14][15] At present, phosphors with a wavelength of 660 nm have been extensively studied. [16][17][18][19][20] Therefore, the blue-green phosphor in the 490nm band is a key issue in the research and preparation of full-spectrum LEDs. Currently, some blue-green phosphors, for example silicate (M 2 SiO 4 : Eu 2+ , M = Ca, Ba, Sr), sulfide (M 2 BS 4 : Eu 2+ , M = Ba, Sr, Ca, B = Al, Ga, In) aluminate (MSrAl 37 : Eu 2+ , M = Y, La, Gd), have been developed.…”

Section: Introductionmentioning

confidence: 99%

Effect of sintering temperature on luminescence properties of borosilicate matrix blue–green emitting color conversion glass ceramics*

Zheng¹,

Yang²,

Wu³

et al. 2019

Chinese Phys. B

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The color conversion glass ceramics which were made of borosilicate matrix co-doped (SrBaSm)Si2O2N2: (Eu3+Ce3+) blue–green phosphors were prepared by two-step method in co-sintering. The change in luminescence properties and the drift of chromaticity coordinates (CIE) of the (SrBaSm)Si2O2N2: (Eu3+Ce3+) blue–green phosphors and the color conversion glass ceramics were studied in the sintering temperature range from 600 °C to 800 °C. The luminous intensity and internal quantum yield (QY) of the blue–green phosphors and glass ceramics decreased with the sintering temperature increasing. When the sintering temperature increased beyond 750 °C, the phosphors and the color conversion glass ceramics almost had no peak in photoluminescence (PL) and excitation (PLE) spectra. The results showed that the blue–green phosphors had poor thermal stability at higher temperature. The lattice structure of the phosphors was destroyed by the glass matrix and the Ce3+ in the phosphors was oxidized to Ce4+, which further caused a decrease in luminescent properties of the color conversion glass ceramics.

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Structure, luminescence and thermal quenching properties of Eu doped Sr2−xBaxSi5N8 red phosphors

Cited by 13 publications

References 21 publications

Down-Conversion Nitride Materials for Solid State Lighting: Recent Advances and Perspectives

Down-Conversion Nitride Materials for Solid State Lighting: Recent Advances and Perspectives

Research on Molecular Structure and Electronic Properties of Ln3+ (Ce3+, Tb3+, Pr3+)/Li+ and Eu2+ Co-Doped Sr2Si5N8 via DFT Calculation

Effect of sintering temperature on luminescence properties of borosilicate matrix blue–green emitting color conversion glass ceramics*

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