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Achieving efficient red-emitting Sr2Ca1−δLnδWO6 : Mn4+ (Ln = La, Gd, Y, Lu, δ = 0.10) phosphors with extraordinary luminescence thermal stability for potential UV-LEDs application via facile ion substitution in luminescence-ignorable Sr2CaWO6:Mn4+

Kai Li (UGent) , Jiaren Du (UGent) , Dirk Poelman (UGent) , Henk Vrielinck (UGent) , Dimitrije Mara (UGent) and Rik Van Deun (UGent)
(2020) ACS MATERIALS LETTERS. 2(7). p.771-778
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Abstract
In this work, we adopt a facile rare earth ions Ln3+ (Ln = La, Gd, Y, Lu) substitution strategy to achieve the efficient red luminescence Sr2Ca1−δLnδWO6:Mn4+ (δ = 0.10), which extremely improves the luminescence properties of luminescence-ignorable Sr2CaWO6:Mn4+. It is demonstrated that the substitution of Ln3+ for Ca2+ can stabilize the Mn in tetravalent state, which would like to occupy W6+ site and generate the luminescence. It is also found that the emission profile of original Sr2CaWO6:Mn4+ changes manifestly after different Ln3+ ions substitution, which is mainly attributed to the synergistic effect of lattice distortion, Mn4+ transition 2Eg → 4A2g and lattice vibration. Most fascinatingly, the Sr2Ca0.9Ln0.1WO6:0.005Mn4+ (SC0.9Ln0.1WO:0.005Mn4+, Ln = La, Gd) show extraordinary luminescence thermal stability, whose integrated emission intensity still maintains about 95% (Gd, 96.8%; La, 94.8%) at 478 K of its original value at room temperature (298 K), much better than those in most reported Mn4+-activated oxide phosphors so far. It is confirmed that the traps may play an important role for this phenomenon. Best of all, this work gives us a facile strategy to achieve efficient Mn4+-activated red-emitting materials with extraordinary luminescence thermal stabilities derived from luminescence-ignorable ones.
Keywords
PHOTOLUMINESCENCE PROPERTIES, ELECTRONIC-STRUCTURE, CRYSTAL-STRUCTURE, MN4+

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MLA
Li, Kai, et al. “Achieving Efficient Red-Emitting Sr2Ca1−δLnδWO6 : Mn4+ (Ln = La, Gd, Y, Lu, δ = 0.10) Phosphors with Extraordinary Luminescence Thermal Stability for Potential UV-LEDs Application via Facile Ion Substitution in Luminescence-Ignorable Sr2CaWO6:Mn4+.” ACS MATERIALS LETTERS, vol. 2, no. 7, 2020, pp. 771–78, doi:10.1021/acsmaterialslett.0c00212.
APA
Li, K., Du, J., Poelman, D., Vrielinck, H., Mara, D., & Van Deun, R. (2020). Achieving efficient red-emitting Sr2Ca1−δLnδWO6 : Mn4+ (Ln = La, Gd, Y, Lu, δ = 0.10) phosphors with extraordinary luminescence thermal stability for potential UV-LEDs application via facile ion substitution in luminescence-ignorable Sr2CaWO6:Mn4+. ACS MATERIALS LETTERS, 2(7), 771–778. https://doi.org/10.1021/acsmaterialslett.0c00212
Chicago author-date
Li, Kai, Jiaren Du, Dirk Poelman, Henk Vrielinck, Dimitrije Mara, and Rik Van Deun. 2020. “Achieving Efficient Red-Emitting Sr2Ca1−δLnδWO6 : Mn4+ (Ln = La, Gd, Y, Lu, δ = 0.10) Phosphors with Extraordinary Luminescence Thermal Stability for Potential UV-LEDs Application via Facile Ion Substitution in Luminescence-Ignorable Sr2CaWO6:Mn4+.” ACS MATERIALS LETTERS 2 (7): 771–78. https://doi.org/10.1021/acsmaterialslett.0c00212.
Chicago author-date (all authors)
Li, Kai, Jiaren Du, Dirk Poelman, Henk Vrielinck, Dimitrije Mara, and Rik Van Deun. 2020. “Achieving Efficient Red-Emitting Sr2Ca1−δLnδWO6 : Mn4+ (Ln = La, Gd, Y, Lu, δ = 0.10) Phosphors with Extraordinary Luminescence Thermal Stability for Potential UV-LEDs Application via Facile Ion Substitution in Luminescence-Ignorable Sr2CaWO6:Mn4+.” ACS MATERIALS LETTERS 2 (7): 771–778. doi:10.1021/acsmaterialslett.0c00212.
Vancouver
1.
Li K, Du J, Poelman D, Vrielinck H, Mara D, Van Deun R. Achieving efficient red-emitting Sr2Ca1−δLnδWO6 : Mn4+ (Ln = La, Gd, Y, Lu, δ = 0.10) phosphors with extraordinary luminescence thermal stability for potential UV-LEDs application via facile ion substitution in luminescence-ignorable Sr2CaWO6:Mn4+. ACS MATERIALS LETTERS. 2020;2(7):771–8.
IEEE
[1]
K. Li, J. Du, D. Poelman, H. Vrielinck, D. Mara, and R. Van Deun, “Achieving efficient red-emitting Sr2Ca1−δLnδWO6 : Mn4+ (Ln = La, Gd, Y, Lu, δ = 0.10) phosphors with extraordinary luminescence thermal stability for potential UV-LEDs application via facile ion substitution in luminescence-ignorable Sr2CaWO6:Mn4+,” ACS MATERIALS LETTERS, vol. 2, no. 7, pp. 771–778, 2020.
@article{8664591,
  abstract     = {In this work, we adopt a facile rare earth ions Ln3+ (Ln = La, Gd, Y, Lu) substitution strategy to achieve the efficient red luminescence Sr2Ca1−δLnδWO6:Mn4+ (δ = 0.10), which extremely improves the luminescence properties of luminescence-ignorable Sr2CaWO6:Mn4+. It is demonstrated that the substitution of Ln3+ for Ca2+ can stabilize the Mn in tetravalent state, which would like to occupy W6+ site and generate the luminescence. It is also found that the emission profile of original Sr2CaWO6:Mn4+ changes manifestly after different Ln3+ ions substitution, which is mainly attributed to the synergistic effect of lattice distortion, Mn4+ transition 2Eg → 4A2g and lattice vibration. Most fascinatingly, the Sr2Ca0.9Ln0.1WO6:0.005Mn4+ (SC0.9Ln0.1WO:0.005Mn4+, Ln = La, Gd) show extraordinary luminescence thermal stability, whose integrated emission intensity still maintains about 95% (Gd, 96.8%; La, 94.8%) at 478 K of its original value at room temperature (298 K), much better than those in most reported Mn4+-activated oxide phosphors so far. It is confirmed that the traps may play an important role for this phenomenon. Best of all, this work gives us a facile strategy to achieve efficient Mn4+-activated red-emitting materials with extraordinary luminescence thermal stabilities derived from luminescence-ignorable ones.},
  author       = {Li, Kai and Du, Jiaren and Poelman, Dirk and Vrielinck, Henk and Mara, Dimitrije and Van Deun, Rik},
  issn         = {2639-4979},
  journal      = {ACS MATERIALS LETTERS},
  keywords     = {PHOTOLUMINESCENCE PROPERTIES,ELECTRONIC-STRUCTURE,CRYSTAL-STRUCTURE,MN4+},
  language     = {eng},
  number       = {7},
  pages        = {771--778},
  title        = {Achieving efficient red-emitting Sr2Ca1−δLnδWO6 : Mn4+ (Ln = La, Gd, Y, Lu, δ = 0.10) phosphors with extraordinary luminescence thermal stability for potential UV-LEDs application via facile ion substitution in luminescence-ignorable Sr2CaWO6:Mn4+},
  url          = {http://dx.doi.org/10.1021/acsmaterialslett.0c00212},
  volume       = {2},
  year         = {2020},
}

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