文献类型：期刊文献

英文题名：Significant enhancement of visible up-conversion emissions of Y2O2S:Er3+ phosphors by Mn2+ sensitizing under 1550 nm excitation

作者：Yuan, Shuanglong[1];Zeng, Huidan[1];Wu, Xuanshun[1];Liu, Zhao[1,2];Ren, Jing[1];Chen, Guorong[1];Wang, Zhaofeng[3,4];Sun, Luyi[3,4]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]S China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China;[3]Univ Connecticut, Inst Mat Sci, Dept Biomol & Chem Engn, Storrs, CT 06269 USA;[4]Univ Connecticut, Polymer Program, Storrs, CT 06269 USA

年份：2014

卷号：4

期号：32

起止页码：16710

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20141617584814);WOS:【SCI-EXPANDED(收录号:WOS:000335016400044)】；

基金：This work is financially supported by the Natural Science Foundation of Shanghai (12ZR1407600, 11ZR1409300), the Fundamental Research Funds for the Central Universities, the Shanghai Leading Academic Discipline Project (B502), and the Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology). L. S. acknowledges the National Science Foundation (Partnerships for Research and Education in Materials, DMR-1205670), Air Force Office of Scientific Research (no. FA9550-12-1-0159), and a Faculty Large Grant from the University of Connecticut for partial support of this project.

语种：英文

外文关键词：Manganese compounds - Metal ions - Rare earths - Uranium compounds - Erbium compounds - Luminescence - High temperature applications - Laser excitation - Solid state reactions

摘要：A novel up-conversion (UC) emission route of Er3+ by Mn2+ sensitizing in a Y2O2S: Er3+ phosphor prepared via a high-temperature solid-state reaction method is reported here. This methodology resulted in a significant enhancement of visible up-conversion emission by 1550 nm laser diode excitation. By codoping Mn2+, the visible (red and green) UC emission intensity, which is assigned to the transitions of F-4(9/2) -> I-4(15/2) (670 nm), S-4(3/2) -> I-4(15/2) (547 nm), H-2(11/2) -> I-4(15/2) (528 nm) of Er3+, was 2 to 3 times higher than that of the Mn2+-free one. As the concentration of Mn2+ was increased, the visible UC emission intensity was enhanced and then reduced. The phosphor powders were well crystallized in a hexagonal shape with an average size of ca. 2 mu m. Based on the results of the luminescence spectra, energy matching conditions and three-photon process dependence on excitation power, a possible UC mechanism is proposed. The proposed sensitizing route may lead to a promising step towards highintensity UC emissions of rare-earth ion doped phosphors.