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http://dx.doi.org/10.6111/JKCGCT.2013.23.3.142

Visible green upconversion luminescence of Li+/Er3+/Yb3+ co-doped CaWO4 phosphor and effects of Yb3+ concentration  

Cho, Hyun (Department of Nanomechatronics and Engineering, Pusan National University)
Lee, Jung-Il (Department of Materials Science and Engineering, Korea National University of Transportation)
Ryu, Jeong Ho (Department of Materials Science and Engineering, Korea National University of Transportation)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.23, no.3, 2013 , pp. 142-145 More about this Journal
Abstract
The upconversion (UC) luminescence of $Li^+/Er^{3+}/Yb^{3+}$ co-doped $CaWO_4$ phosphors and effects of $Yb^{3+}$ concentration are investigated in detail. Single crystallized $CaWO_4$ : $Li^+/Er^{3+}/Yb^{3+}$ phosphor can be obtained, co-doped up to 35.0/5.0/30.0 mol% ($Li^+/Er^{3+}/Yb^{3+}$) by solid-state reaction. Under 980 nm excitation, $CaWO_4$ : $Li^+/Er^{3+}/Yb^{3+}$ phosphor exhibited strong green UC emissions visible to the naked eye at 530 and 550 nm induced by the intra 4f transitions of $Er^{3+}$ ($^4H_{11/2}$, $^4S_{3/2}{\rightarrow}^4I_{15/2}$). The optimum doping concentrations of $Yb^{3+}$ that would result in the highest UC luminescence were determined, and a possible UC mechanism that depends on the pumping power is discussed in detail.
Keywords
$CaWO_4$ : $Li^+/Er^{3+}/Yb^{3+}$; Upconversion; Luminescence;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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