Research Papers

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

[+] Author Affiliations
Gonul Eryurek, Hatun Cinkaya

Istanbul Technical University, Department of Physics, Maslak 34469, Istanbul, Turkey

Murat Erdem

Marmara University, Department of Physics, Istanbul 34722, Turkey

Gokhan Bilir

Kafkas University, Department of Physics, Kars 36100, Turkey

J. Nanophoton. 10(2), 026022 (May 26, 2016). doi:10.1117/1.JNP.10.026022
History: Received March 16, 2016; Accepted April 22, 2016
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Abstract.  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 the WL 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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Gonul Eryurek ; Hatun Cinkaya ; Murat Erdem and Gokhan Bilir
"Blue cooperative upconversion and white light emission from Y2Si2O7:Yb3+ nanopowders due to 975-nm infrared excitation", J. Nanophoton. 10(2), 026022 (May 26, 2016). ; http://dx.doi.org/10.1117/1.JNP.10.026022


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