Structural and luminescence properties of Y2‐xGeMoO8:REx (RE = Eu, Tb) phosphors. (5th July 2013)

• Record Type: Journal Article
• Authors: Li, Naixu; Zhou, Jiancheng; Sun, Yueming
• Is Part Of: Luminescence. Volume 29:Number 5(2014:Sep./Oct.)
• Page Start: 401
• Page End: 406
• Publication Date: 2013-07-05
• Subjects: Luminescence -- Periodicals; Bioluminescence -- Periodicals; Chemiluminescence -- Periodicals; Luminescence -- Periodicals; 535.35
• DOI: 10.1002/bio.2558
• Languages: English
• ISSNs: 1522-7235

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>Y_{2‐<italic>x</italic>}GeMoO₈:RE<italic>_x</italic> (RE = Eu, Tb) phosphors were synthesized using a facile sol–gel method. The morphology and structure of the phosphors were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X‐ray diffraction (XRD); while their luminescent properties were investigated by photoluminescence (PL) spectrometry. Our results reveal that all of these Y_{2‐<italic>x</italic>}GeMoO₈:RE<italic>_x</italic> (RE = Eu, Tb) phosphors adopted the tetragonal phase, belonging to Scheelite (CaWO₄) structure. The obtained YGeMoO₈:Eu phosphors exhibit a strong emission in the red light range which can be assigned to the ⁵D₀ → ⁷F₂ transition of Eu³⁺ when it is excited at 459 nm. Under 392 and 489 nm excitation, the YGeMoO₈:Tb phosphors present predominant green emission (⁵D₄ → ⁷F₅) at 540 nm. The highest emission of the phosphors can be achieved by adjusting the doping concentration to be 0.25 for Eu³⁺ and 0.15 for Tb³⁺, respectively. The promising luminescence properties of these materials indicate that they can be potentially applied to white‐light‐emitting diodes. Copyright © 2013 John Wiley &amp; Sons, Ltd.</p> </abstract>