Crystal structure and spectroscopic properties of garnet-type Li7La3Hf2O12:Eu3+ / Leonidov Ivan I.,Baklanova Yana V.,Maksimova Lidiya G.,Tyutyunnik Alexander P.,Akashev Lev A.,Vovkotrub Emma G.,Denisova Tatyana A.,Zubkov Vladimir G. // JOURNAL OF ALLOYS AND COMPOUNDS. - 2016. - V. 686, l. . - P. 204-215.

ISSN/EISSN:

0925-8388 / 1873-4669

Type:

Article

Abstract:

A promising series of phosphors based on Li7La3-xEuxHf2O12 (x = 0.05-0.20) has been prepared using a conventional solid state reaction. Rietveld refinement of room temperature powder X-ray diffraction patterns shows that the Li7La3-xEuxHf2O12 (x = 0.00-0.20) solid solution crystallizes in the tetragonal space group I4(1)/acd, Z = 8. The trivalent europium ions occupy two crystallographically nonequivalent sites (8b) and (16e) with the D'(2) and C-2 symmetry, respectively. Raman spectroscopy corroborates the Xray diffraction results and confirms the crystal structure features of tetragonal Li7La3Hf2O12 with the maximum phonon energy of 650 cm(-1). The phosphors exhibit reddish orange emission under excitation at 282 nm. Calculation of the Omega(2) and Omega(4) Judd-Ofelt intensity parameters and quantum efficiencies from the recorded emission spectra allows a more extensive study of the luminescence properties of Eu3+-doped Li7La3Hf2O12. The maximum light emission is revealed at the activator content of x = 0.15 in Li7La3-xEuxHf2O12. CIE chromaticity coordinates of Li7La2.85Eu0.15Hf2O12 are x = 0.643 and y = 0.354. (C) 2016 Elsevier B.V. All rights reserved.

Author keywords:

Crystal structure; X-ray diffraction; Oxide materials; Luminescence JUDD-OFELT PARAMETERS; RARE-EARTH IONS; OPTICAL-PROPERTIES; AB-INITIO; LUMINESCENT PROPERTIES; LOCAL-STRUCTURE; ENERGY-TRANSFER; EU3+ PHOSPHORS; LI7LA3ZR2O12; PHOTOLUMINESCENCE

DOI:

10.1016/j.jallcom.2016.05.296

Web of Science ID:

ISI:000382228300028

Соавторы в МНС:

Другие поля

Поле	Значение
Month	NOV 25
Publisher	ELSEVIER SCIENCE SA
Address	PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Language	English
EISSN	1873-4669
Keywords-Plus	JUDD-OFELT PARAMETERS; RARE-EARTH IONS; OPTICAL-PROPERTIES; AB-INITIO; LUMINESCENT PROPERTIES; LOCAL-STRUCTURE; ENERGY-TRANSFER; EU3+ PHOSPHORS; LI7LA3ZR2O12; PHOTOLUMINESCENCE
Research-Areas	Chemistry; Materials Science; Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy \& Metallurgical Engineering
Author-Email	ivanleonidov@ihim.uran.ru
ResearcherID-Numbers	Leonidov, Ivan/I-6576-2013
ORCID-Numbers	Leonidov, Ivan/0000-0002-6635-4747
Funding-Acknowledgement	FASO {[}0397-2015-0020]; RFBR {[}15-03-03951a]
Funding-Text	The authors are grateful to Dr. Irina V. Nikolaenko (Institute of Solid State Chemistry, UB RAS, Ekaterinburg, Russia) for her valuable help in the SEM data collection. This work was partially supported by the FASO (Program No. 0397-2015-0020) and RFBR (Grant No. 15-03-03951a). The crystallographic and Raman spectroscopic studies were carried out at the multiple-access centers for X-ray structure analysis at the Institute of Solid State Chemistry UB RAS (Ekaterinburg, Russia) and for vibrational spectroscopy at the Institute of High-Temperature Electrochemistry UB RAS (Ekaterinburg, Russia), respectively.
Number-of-Cited-References	96
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	46
Journal-ISO	J. Alloy. Compd.
Doc-Delivery-Number	DU5BZ