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Photoluminescence and energy transfer properties of a novel molybdate KBaY(MoO4)3:Ln3+ (Ln3+ = Tb3+, Eu3+, Sm3+, Tb3+/Eu3+, Tb3+/Sm3+) as a multi-color emitting phosphor for UV w-LEDs

Kai Li (UGent) and Rik Van Deun (UGent)
(2018) DALTON TRANSACTIONS. 47(20). p.6995-7004
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Abstract
In this article, we report the preparation and luminescence properties of a series of novel rare-earth doped KBaY(MoO4)(3) phosphors. The XRD patterns for the as-prepared samples have been assigned to the pure KBaY(MoO4)(3) phase. The Tb3+, Eu3+ and Sm3+ singly-doped phosphors all show good luminescence properties with their characteristic excitations and emissions. We have optimized the rare-earth ion doping concentrations, yielding the compositions KBaY0.60(MoO4):0.40Tb(3+), KBaY0.50(MoO4):0.50Eu(3+) and KBaY0.96(MoO4):0.04Sm(3+) with corresponding quantum yields of 15.80% (lambda(ex) = 376 nm), 40.67% (lambda(ex) = 392 nm) and 16.79% (lambda(ex) = 402 nm), respectively. In addition, we have chosen co-doping of Tb3+/Eu3+ and Tb3+/Sm3+ into the host to realize tunable emission colors. We have observed energy transfer from Tb3+ to Eu(3+ )and from Tb3+ to Sm3+ ions in the as-prepared samples, which resulted in tunable emission colors from green to red and to orange-red under UV excitation, respectively. Moreover, investigation of the excitation and emission spectra, and decay lifetimes with increasing doping concentrations confirmed efficient energy transfer from Tb3+ to Eu3+ and from Tb3+ to Sm3+ ions in the co-doped samples. We also analyzed the energy transfer mechanisms between Tb3+ and Eu3+ and between Tb-3(+) and Sm3+ and both were determined to be dipole-dipole interactions. These results show that the as-prepared materials could serve as candidate phosphors for use in UV-pumped w-LEDs.
Keywords
LANTHANIDE AQUO IONS, LUMINESCENCE PROPERTIES, TUNABLE LUMINESCENCE, WHITE LEDS, EMISSION ENHANCEMENT, EXCITATION-ENERGY, OXIDIC PHOSPHORS, RED PHOSPHORS, DIODES, TM3+

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Chicago
Li, Kai, and Rik Van Deun. 2018. “Photoluminescence and Energy Transfer Properties of a Novel Molybdate KBaY(MoO4)3:Ln3+ (Ln3+ = Tb3+, Eu3+, Sm3+, Tb3+/Eu3+, Tb3+/Sm3+) as a Multi-color Emitting Phosphor for UV w-LEDs.” Dalton Transactions 47 (20): 6995–7004.
APA
Li, Kai, & Van Deun, R. (2018). Photoluminescence and energy transfer properties of a novel molybdate KBaY(MoO4)3:Ln3+ (Ln3+ = Tb3+, Eu3+, Sm3+, Tb3+/Eu3+, Tb3+/Sm3+) as a multi-color emitting phosphor for UV w-LEDs. DALTON TRANSACTIONS, 47(20), 6995–7004.
Vancouver
1.
Li K, Van Deun R. Photoluminescence and energy transfer properties of a novel molybdate KBaY(MoO4)3:Ln3+ (Ln3+ = Tb3+, Eu3+, Sm3+, Tb3+/Eu3+, Tb3+/Sm3+) as a multi-color emitting phosphor for UV w-LEDs. DALTON TRANSACTIONS. 2018;47(20):6995–7004.
MLA
Li, Kai, and Rik Van Deun. “Photoluminescence and Energy Transfer Properties of a Novel Molybdate KBaY(MoO4)3:Ln3+ (Ln3+ = Tb3+, Eu3+, Sm3+, Tb3+/Eu3+, Tb3+/Sm3+) as a Multi-color Emitting Phosphor for UV w-LEDs.” DALTON TRANSACTIONS 47.20 (2018): 6995–7004. Print.
@article{8562542,
  abstract     = {In this article, we report the preparation and luminescence properties of a series of novel rare-earth doped KBaY(MoO4)(3) phosphors. The XRD patterns for the as-prepared samples have been assigned to the pure KBaY(MoO4)(3) phase. The Tb3+, Eu3+ and Sm3+ singly-doped phosphors all show good luminescence properties with their characteristic excitations and emissions. We have optimized the rare-earth ion doping concentrations, yielding the compositions KBaY0.60(MoO4):0.40Tb(3+), KBaY0.50(MoO4):0.50Eu(3+) and KBaY0.96(MoO4):0.04Sm(3+) with corresponding quantum yields of 15.80\% (lambda(ex) = 376 nm), 40.67\% (lambda(ex) = 392 nm) and 16.79\% (lambda(ex) = 402 nm), respectively. In addition, we have chosen co-doping of Tb3+/Eu3+ and Tb3+/Sm3+ into the host to realize tunable emission colors. We have observed energy transfer from Tb3+ to Eu(3+ )and from Tb3+ to Sm3+ ions in the as-prepared samples, which resulted in tunable emission colors from green to red and to orange-red under UV excitation, respectively. Moreover, investigation of the excitation and emission spectra, and decay lifetimes with increasing doping concentrations confirmed efficient energy transfer from Tb3+ to Eu3+ and from Tb3+ to Sm3+ ions in the co-doped samples. We also analyzed the energy transfer mechanisms between Tb3+ and Eu3+ and between Tb-3(+) and Sm3+ and both were determined to be dipole-dipole interactions. These results show that the as-prepared materials could serve as candidate phosphors for use in UV-pumped w-LEDs.},
  author       = {Li, Kai and Van Deun, Rik},
  issn         = {1477-9226},
  journal      = {DALTON TRANSACTIONS},
  keyword      = {LANTHANIDE AQUO IONS,LUMINESCENCE PROPERTIES,TUNABLE LUMINESCENCE,WHITE LEDS,EMISSION ENHANCEMENT,EXCITATION-ENERGY,OXIDIC PHOSPHORS,RED PHOSPHORS,DIODES,TM3+},
  language     = {eng},
  number       = {20},
  pages        = {6995--7004},
  title        = {Photoluminescence and energy transfer properties of a novel molybdate KBaY(MoO4)3:Ln3+ (Ln3+ = Tb3+, Eu3+, Sm3+, Tb3+/Eu3+, Tb3+/Sm3+) as a multi-color emitting phosphor for UV w-LEDs},
  url          = {http://dx.doi.org/10.1039/c8dt01011k},
  volume       = {47},
  year         = {2018},
}

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