Enhanced luminescence of Sr2SiO4:Dy3+ by sensitization (Ce3+/Eu2+) and fabrication of white light-emitting-diodes

Enhanced luminescence of Sr2SiO4:Dy3+ by sensitization (Ce3+/Eu2+) and fabrication of white light-emitting-diodes

The role of sensitization by co-doping Ce3+/Eu2+ in the Sr2SiO4:Dy3+ phosphor system is studied with a view of improving the emission properties and chromaticity coordinates. The concentration dependence of the emission intensity of Dy3+ in Sr2−2xDyxLixSiO4: (x=0.01–0.05 in steps of 0.01) is studied...

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Bibliographic Details
Published in:Materials letters Vol. 117; pp. 302 - 304
Main Authors: Pardha Saradhi, M., Lakshminarasimhan, N., Boudin, S., Vijay Kumar Gupta, K., Varadaraju, U.V., Raveau, B.
Format: Journal Article
Language:English
Published: Elsevier B.V 15-02-2014
Subjects:
Chip formation
Chromaticity
Dysprosium
Emission
Emission analysis
Energy transfer
Lithium
Luminescence
Phosphors
Rare earth activators
Silicate
Solid state lighting
Sr2SiO4
White emitting diodes
Solid state lighting
Silicate
Sr2SiO4
Rare earth activators
White emitting diodes
Energy transfer
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Summary:The role of sensitization by co-doping Ce3+/Eu2+ in the Sr2SiO4:Dy3+ phosphor system is studied with a view of improving the emission properties and chromaticity coordinates. The concentration dependence of the emission intensity of Dy3+ in Sr2−2xDyxLixSiO4: (x=0.01–0.05 in steps of 0.01) is studied, and the critical concentration is found to be 3mol% Dy3+ per formula unit. Partial energy transfer from Ce3+ to Dy3+ is observed, and the luminescence intensity of Dy3+ is enhanced. It is also found that Eu2+, Ce3+ containing compositions show better white emission than the corresponding Sr2SiO4:Dy3+. LEDs fabricated by coating the ultraviolet (UV) emitting chips with the synthesized phosphor compositions show bright white emission with reasonable chromaticity coordinates. The emission properties of Sr2SiO4:Dy3+ phosphor is enhanced by sensitization of Ce3+/Eu2+. Energy transfer from Ce3+ to Dy3+ as well as Eu2+ is observed in Sr2SiO4 host lattice. UV LEDs coated with the synthesized phosphor shows reasonable CIE coordinates. The figure shows the emission spectrum of fabricated white LED's inset shows the crystal structure of Sr2SiO4 with the photograph of fabricated white emitting diodes. [Display omitted] •We report the fine-tuning of emission properties of Sr2SiO4:Dy3+ by sensitization.•We observed multiple energy transfer from Ce3+ to Dy3+, Eu2+ in Sr2SiO4 host lattice.•The phosphor Sr2SiO4:Ce3+, Eu2+, Dy3+ exhibits full color emission properties (blue, green, and yellow).•The fabricated UV emitting white LEDs shows bright white emission.
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content type line 23
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2013.12.020