Upconversion in Er3+:ZrO2 nanocrystals
Upconversion in Er3+:ZrO2 nanocrystals
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DOI：
10.1021/jp013576z
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发表时间：
2002-02-28
影响因子：
3.3
通讯作者：
Prasad, PN
中科院分区：
文献类型：
--
作者：
Patra, A;Friend, CS;Prasad, PN
采用溶胶-乳液-凝胶法制备了掺铒氧化锆纳米粒子。报道了Er ~（3+）浓度和ZrO_2基质中不同共掺杂（Yb ~（3+）和Y ~（3+））对上转换发光的影响。在980 nm激发下，从这些氧化物纳米晶体中观察到550和670 nm处的绿色和红色上转换发射。总强度随着氧化锆中铒浓度的增加而降低。共掺杂剂（Y3+和Yb 3+）的存在也增加了上转换发射的总体强度。的发射光谱和泵浦强度依赖的发光强度被用来理解的激发机制。这些结果证实了这些材料中的上转换发射是由于双光子激发态吸收（ESA）/能量转移上转换（ETU）过程。
Erbium-doped ZrO2 nanoparticles are prepared by a sol-emulsion-gel technique. The effects of the Er3+ concentration and different codopants (Yb3+ and y(3+)) in the ZrO2 matrix on the upconverted emission are reported. Green and red upconversion emission at 550 and 670 nm were observed from these oxide nanocrystals with 980 nm excitation. The overall intensity decreases with an increasing concentration of erbium in zirconia. The presence of codopants (Y3+ and Yb3+) also increases the overall intensity of the upconverted emission. The emission spectra and the pump intensity dependence of the luminescence intensities are used to understand the excitation mechanism. These results confirm that upconverted emission in these materials is due to a two-photon excited-state absorption (ESA)/energy transfer upconversion (ETU) process.