NDLI: Photoluminescence and cathodoluminescence properties of green–red emitting ZnGd$_{4}$Si$_{3}$O$

Content Provider	Springer Nature Link
Author	Yang, Che Yuan Som, Sudipta Das, Subrata Lu, Chung Hsin
Copyright Year	2017
Abstract	The photoluminescence and cathodoluminescence properties of new silicate oxyapatite phosphors ZnGd$_{4}$Si$_{3}$O$_{13}$: Tb$^{3+}$, Mn$^{2+}$ were investigated in this study. The Rietveld refinement indicated that the prepared phosphors exhibited a hexagonal structure with space group P6$_{3}$/m (no. 176). Under UV excitation, ZnGd$_{4}$Si$_{3}$O$_{13}$: Mn$^{2+}$ phosphors presented a red emission band due to the T$_{1}$($^{4}$G)–$^{6}$A$_{1}$($^{6}$S) transition of Mn$^{2+}$ ions, while ZnGd$_{4}$Si$_{3}$O$_{13}$: Tb$^{3+}$ showed several emission lines at 490, 544, 585 and 621 nm attributed to the $^{5}$D$_{4}$→$^{7}$F$_{J}$ (J = 6, 5, 4, 3) transitions of Tb$^{3+}$ ions. The co-doping of Tb$^{3+}$ ions into ZnGd$_{4}$Si$_{3}$O$_{13}$: Mn$^{2+}$ resulted in a 100% enhancement of the photoluminescence intensity for Mn$^{2+}$ ions through a dipole–dipole energy transfer mechanism. On the other hand, the energy transfer process from the sensitizers (Tb$^{3+}$) to the activators (Mn$^{2+}$) led to a decrease in Tb$^{3+}$ emission as co-doping Mn$^{2+}$ ions into ZnGd$_{4}$Si$_{3}$O$_{13}$: Tb$^{3+}$. Increasing the concentration of Mn$^{2+}$ ions from x = 0.02 to x = 0.08 for Zn$_{2−x}$Mn$_{x}$Gd$_{3}$TbSi$_{3}$O$_{13}$ efficiently enhanced the energy transfer efficiency from 90 to 98%. Under the electron-beam excitation, the emission spectra of phosphors were similar to those observed under UV excitation. However, a deviation of CIE coordinates was found under the electron-beam excitation due to the relatively unapparent energy transfer between Tb$^{3+}$ and Mn$^{2+}$ ions. The present results suggested a new series of color-tunable phosphors which can be used for both photoluminescence and cathodoluminescence applications.
Starting Page	9174
Ending Page	9181
Page Count	8
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	28
Issue Number	12
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2017-03-14
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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