Blue cooperative upconversion and white light emission from Y2Si2O7:Yb3+ nanopowders due to 975-nm infrared excitation

Gonul Eryurek*, Hatun Cinkaya, Murat Erdem, Gokhan Bilir

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10 Atıf (Scopus)

Özet

We report the luminescence properties of undoped and 10% Yb3-doped Y2Si2O7 nanopowders under the infrared excitation of 975-nm laser diode. A broadband white light (WL) emission is observed in the undoped powder, and its intensity becomes stronger with increasing excitation power. A blue emission centered at ∼475 nm is observed below the excitation power of ∼2 W in the Yb3-doped sample. The blue emission intensity dependence on the excitation power suggests that this emission is a two-photon absorption process known as the cooperative luminescence of Yb3 ions. When the excitation power is increased above 2 W, a broadband white emission extending from blue into the near infrared appears while the blue cooperative emission band of Yb3 ions disappears. The excitation power dependence of theWL intensity at 758 nm is due to a multiphoton process that may be attributed to the thermal radiation mechanism. The International Commission on Illumination coordinates (x; y) for the WL emission in the Yb3-doped Y2Si2O7 nanocrystalline sample is found to be (0.4503, 0.3999) and (0.5035, 0.4096) for 2.005- and 3.68-W excitation powers, respectively. These values lie in the yellowish region and correspond to the color temperature value of 5030 K, with a color rendering index of 85.

Orijinal dilİngilizce
DergiJournal of Nanophotonics
Hacim10
Basın numarası2
DOI'lar
Yayın durumuYayınlandı - 1 Nis 2016

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Publisher Copyright:
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE).

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