NDLI: Mechanism and stability of spectrally pure green up-conversion emission in $Yb^{3+}/Ho^{3+}$ co-doped $Ba_{5}Gd_{8}Zn_{4}O

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Li, Ting Guo, Chongfeng Duan, Changkui Suo, Hao Wang, Wenbin Yin, Min
Description	Author Affiliation: Suo H ( National Key Laboratory of Photoelectric Technology and Functional Materials (Culture Base) in Shaanxi Province, National Photoelectric Technology and Functional Materials & Application of Science and Technology International Cooperation Base, Institute of Photonics & Photon-Technology, Northwest University, Xi'an, 710069, China. guocf@nwu.edu.cn.)
Abstract	A series of green-emitting up-conversion (UC) phosphors $Ba_{5}Gd_{8}Zn_{4}O_{21}:Yb^{3+},Ho^{3+}$ were prepared by a modified sol–gel method, and X-ray diffraction (XRD) patterns were measured to characterize the crystal structure. The obtained UC samples emit dazzling green light and their spectra are composed of strong green emission peaking at 544 nm and negligible red emission peaking at 666 nm with the excitation of a 980 nm near-infrared (NIR) laser diode, assigned to $^{5}F_{4}/^{5}S_{2}$ → $^{5}I_{8}$ and $^{5}F_{5}$ → $^{5}I_{8}$ transitions of $Ho^{3+},$ respectively. The dependence of UC spectra on dopant contents, temperature and pumping power was employed to analyze UC emission color stability. The possible UC mechanisms and processes were proposed based on dependence of the UC emission intensity on pump power, and the lifetimes of green emission $(^{5}F_{4}/^{5}S_{2}$ → $^{5}I_{8})$ were also investigated to better comprehend the energy transfer (ET) process. The origin of spectrally pure green-emitting was discussed in detail by analyzing UC and down-conversion (DC) spectra in both the visible and NIR region by comparing that of the UC phosphor $CaIn_{2}O_{4}:Yb^{3+}/Ho^{3+}$ with highly efficient green emission. Results suggest that $Ba_{5}Gd_{8}Zn_{4}O_{21}:Yb^{3+},Ho^{3+}$ phosphors with intense green emission and high color purity have potential applications in displays and illuminating technology.
ISSN	14779226
Issue Number	6
Volume Number	45
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2016-02-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Coordination Complexes Chemistry Holmium Ytterbium Crystallography, X-Ray Energy Transfer Lasers Spectrometry, Fluorescence Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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