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Size-dependent upconversion luminescence in Er3+/Yb 3+-COdOpCd nanocrystalline yttria: Saturation and thermal effects
其他题名论文其他题名
Bai X.; Song H.; Pan G.; Lei Y.; Wang T.; Ren X.; Lu S.; Dong B.; Dai Q.; Fan L.
2007
发表期刊Journal of Physical Chemistry C
ISSN19327447
卷号111期号:36页码:13611-13617
摘要In this paper, the upconversion luminescent properties of Y 2O3Er3+(1 %)/Yb3+(4%) nanoparticles with different sizes (13-55 nm) and its corresponding bulk material as a function of excitation power were studied under 978-nm excitation. Red ( 4F9/2 &rarr 4I15/2), green ( 2H11/12,4S3/2 &rarr 4I15/2), and blue (2H9/2 &rarr 4I15/2) transitions were observed. The results indicated that the relative intensity of the blue as well as the red to the green increased gradually with decreasing particle size. As a function of excitation power, the slope in the In-In plot for the red emission changed between 2.0 and 1.0 and gradually decreased with increasing particle size, which was attributed to competition between linear decay and upconversion processes for the depletion of the intermediate excited states. As the particle size decreased to 13 nm, a three-photon populating process occurred for the green emission. As the excitation power varied in different paths, gradually increasing or gradually decreasing, a hysteresis loop appeared in the power dependence of emission intensity, which was mainly caused by a local thermal effect induced by laser irradiation. The intensity ratio of 2H11/2 &rarr 4I15/2 to 4S3/2 &rarr 4I15/2 (RHS) varied complicatedly with excitation power, which was theoretically explained considering the thermal distribution and relaxation processes. Two novel cross-relaxation paths were proposed on the basis of the variation of RHS under excitation at different wavelengths, 488 and 978 nm. 2007 American Chemical Society.
收录类别EI
文献类型期刊论文
条目标识符http://ir.ciomp.ac.cn/handle/181722/24514
专题中科院长春光机所知识产出
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Bai X.,Song H.,Pan G.,et al. Size-dependent upconversion luminescence in Er3+/Yb 3+-COdOpCd nanocrystalline yttria: Saturation and thermal effects[J]. Journal of Physical Chemistry C,2007,111(36):13611-13617.
APA Bai X..,Song H..,Pan G..,Lei Y..,Wang T..,...&Fan L..(2007).Size-dependent upconversion luminescence in Er3+/Yb 3+-COdOpCd nanocrystalline yttria: Saturation and thermal effects.Journal of Physical Chemistry C,111(36),13611-13617.
MLA Bai X.,et al."Size-dependent upconversion luminescence in Er3+/Yb 3+-COdOpCd nanocrystalline yttria: Saturation and thermal effects".Journal of Physical Chemistry C 111.36(2007):13611-13617.
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