Highly Stable Red‐Emitting Sr2Si5N8:Eu2+ Phosphor with a Hydrophobic Surface

Zhang, Bi; Wang, Junwei; Hao, Lü; Xu, Xin; Agathopoulos, Simeon; Yin, Liang; Wang, Cheng Ming; Hintzen, H. T.

doi:10.1111/jace.14560

Cited by 37 publications

(20 citation statements)

References 42 publications

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“…Renowned (oxy)nitrides in which Ce 3+ can extend the absorption band to blue/green include La 3 Si 6 N 11 , Ca‐α‐Sialon, CaAlSiN 3 , SrAlSi 4 N 7 , etc . Generally, the synthesis of (oxy)nitrides/carbides need harsh environment (i.e., high temperature/pressure) while sulfides suffer from hydrolysis degradation. In silicate, aluminate, and oxyhalide hosts, ε c of Ce 3+ becomes smaller and thus a large ε cfs is necessary to enable efficient excitation by violet‐to‐blue light .…”

Section: Introductionmentioning

confidence: 99%

Local coordination, electronic structure, and thermal quenching of Ce³⁺ in isostructural Sr₂GdAlO₅ and Sr₃AlO₄F phosphors

Asami

et al. 2018

J Am Ceram Soc

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Sr2GdAlO5:Ce and Sr3AlO4F:Ce are isostructural phosphors in which the Ce3+ 4f‐5d1 transition can be efficiently excited by a photon with energy lower than 3.1 eV. Herein, we analyze the crystal chemistry of the Ce3+ local coordination, compare the thermal quenching behavior and construct the electronic structure of Ce3+ in them. The Rietveld refinement on two occupancy models suggests that Gd3+ only occupies the 8h site in Sr2GdAlO5; this provides a hint on the preferred occupancy of dopant Ce3+ in this site. The large crystal filed splitting of Ce8h is mainly due to the fact that the 8h site is bonded to two oxygen with relatively short dSr/Gd‐O and forms a quasi‐square antiprism which experiences a large distortion. The Ce3+ 5d‐4f luminescence in Sr3AlO4F is much more stable against thermal quenching than that in Sr2GdAlO5, as evidenced by the temperature‐dependent luminescence intensity and luminescence decay studies. The energy of the O2−‐Eu3+/2+ and O2−‐Ce4+/3+ charge transfer as well as bandgap were estimated and the electronic structure of Ce3+ were constructed. A larger energy barrier ΔEdC between the Ce3+ 5d1 level and the conduction band bottom in Sr3AlO4F is seen from the Vacuum Referred Binding Energy (VRBE) diagrams which explains the higher thermal quenching temperature by thermal ionization model.

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Section: Introductionmentioning

confidence: 99%

Local coordination, electronic structure, and thermal quenching of Ce³⁺ in isostructural Sr₂GdAlO₅ and Sr₃AlO₄F phosphors

Asami

et al. 2018

J Am Ceram Soc

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“…While in the second method it is one of three constituents for a white color generation. To fulfill the main desire of red color deficiency, many studies devoted which developed various phosphors hosts for red color emission 17,22,23 …”

Section: Introductionmentioning

confidence: 99%

Single phase multi color emitting Ca₂LuTaO₆: Dy³⁺/Eu³⁺ double perovskite oxide phosphors

Khan

Sohail

et al. 2021

J Am Ceram Soc

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The trivalent rare‐earth (RE3+) doped phosphors show tremendous achievement in narrow band multicolor line emission for various applications. However, the 4f–4f absorption transition of these ions is forbidden in UV and blue light excitation. Usually, a sensitizer having spin allowed transition was used as a co‐dopant to excite these ions via the energy transfer phenomenon. Another approach promisingly using to excite these ions by efficient energy transfer from the intrinsic emission of the Ca2LuTaO6 double perovskite phosphors host lattice. Phosphors of Ca2LuTaO6 with double perovskite structure were synthesized by using a high‐temperature solid‐state reaction method. The produced Ca2LuTaO6 double perovskite phosphors show an intrinsic broad band emission centered at 424 nm under the excitation of 313 nm UV light. The origin of this broad band blue emission was deeply investigated by using computation and experimental approaches. The trivalent activator Dy3+ and Eu3+ were doped is a single and co‐dopant in the produced Ca2LuTaO6 phosphors to check their excitation in UV and near‐UV spectral region. X‐ray diffraction and scanning electron microscopy were used to investigate the structure and phase analysis. Various characterizations such as photoluminescence excitation, emission, and CIE chromaticity coordinates were measured which illustrate the potential of Dy3+ and Eu3+ activated Ca2LuTaO6 double perovskite phosphors for narrow band multicolor line emission for various applications.

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“…[9][10][11][12][13][14][15] Moisture-induced degradation of Sr2Si5N8:Eu 2+ phosphors has been minimised by adding a hydrophobic nanolayer formed by hydrolysis and polymerization of tetraethylorthosilicate and polydimethylsiloxane. 16 Another approach was to add a passivating SrSiO3 layer through thermally treatment in a N2-H2 atmosphere. These approaches are effective in reducing the thermaland moisture-induced degradation of PL properties in the red nitridosilicate phosphor.…”

Section: ■ Introductionmentioning

confidence: 99%

Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors

et al. 2017

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Optimizing properties of phosphors for use in white-light-emitting diodes (WLEDs) is an important materials challenge. Most phosphors have a low level of lattice disorder due to mismatch between the host and activator cations. Here we show that deliberate introduction of high levels of cation disorder leads to significant improvements in quantum efficiency, stability to thermal quenching, and emission lifetime in Sr(CaBa)SiN:Eu (x = 0-1.5) phosphors. Replacing Sr by a (CaBa) mixture with the same average radius increases cation size variance, resulting in photoluminescence emission increases of 20-26% for the x = 1.5 sample relative to the x = 0 parent across the 25-200 °C range that spans WLED working temperatures. Cation disorder suppresses nonradiative processes through disruption of lattice vibrations and creates deep traps that release electrons to compensate for thermal quenching. Introduction of high levels of cation disorder may thus be a very useful general approach for improving the efficiency of luminescent materials.

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Highly Stable Red‐Emitting Sr₂Si₅N₈:Eu²⁺ Phosphor with a Hydrophobic Surface

Cited by 37 publications

References 42 publications

Local coordination, electronic structure, and thermal quenching of Ce³⁺ in isostructural Sr₂GdAlO₅ and Sr₃AlO₄F phosphors

Local coordination, electronic structure, and thermal quenching of Ce³⁺ in isostructural Sr₂GdAlO₅ and Sr₃AlO₄F phosphors

Single phase multi color emitting Ca₂LuTaO₆: Dy³⁺/Eu³⁺ double perovskite oxide phosphors

Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors

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Highly Stable Red‐Emitting Sr2Si5N8:Eu2+ Phosphor with a Hydrophobic Surface

Cited by 37 publications

References 42 publications

Local coordination, electronic structure, and thermal quenching of Ce3+ in isostructural Sr2GdAlO5 and Sr3AlO4F phosphors

Local coordination, electronic structure, and thermal quenching of Ce3+ in isostructural Sr2GdAlO5 and Sr3AlO4F phosphors

Single phase multi color emitting Ca2LuTaO6: Dy3+/Eu3+ double perovskite oxide phosphors

Enhanced Photoluminescence Emission and Thermal Stability from Introduced Cation Disorder in Phosphors

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Highly Stable Red‐Emitting Sr₂Si₅N₈:Eu²⁺ Phosphor with a Hydrophobic Surface

Local coordination, electronic structure, and thermal quenching of Ce³⁺ in isostructural Sr₂GdAlO₅ and Sr₃AlO₄F phosphors

Local coordination, electronic structure, and thermal quenching of Ce³⁺ in isostructural Sr₂GdAlO₅ and Sr₃AlO₄F phosphors

Single phase multi color emitting Ca₂LuTaO₆: Dy³⁺/Eu³⁺ double perovskite oxide phosphors