Issue 4, 2014

Hydrothermal syntheses and photoluminescence properties of rare-earth tungstate as near ultraviolet type red phosphors

Abstract

Three families of scheelite CaWO4-based red luminescent phosphors, Ca1−1.5xWO4:xEu3+ (0.02 ≤ x ≤ 0.09), Ca0.925−ySryWO4:0.05Eu3+ (0 ≤ y ≤ 0.9) and Ca0.625Sr0.30W1−zMozO4:0.05Eu3+ (0 ≤ z ≤ 0.7) were hydrothermally prepared and characterized. The substitutions of Sr2+ for Ca2+ and Mo6+ for W6+, which improve local symmetries surrounding Eu3+, assisted the energy transfer from O2− to Eu3+ in the process of optimizing the luminescence properties. The z = 0.2 members of Ca0.625Sr0.30W0.80Mo0.20O4:0.05Eu3+ exhibited excellent bright red luminescence at 616 nm under near-UV excitation, narrowed emission spectra, room temperature luminescence lifetimes of milliseconds and maximum quantum efficiencies of 49%.

Graphical abstract: Hydrothermal syntheses and photoluminescence properties of rare-earth tungstate as near ultraviolet type red phosphors

Article information

Article type
Paper
Submitted
13 Sep 2013
Accepted
28 Nov 2013
First published
29 Nov 2013

New J. Chem., 2014,38, 1441-1445

Hydrothermal syntheses and photoluminescence properties of rare-earth tungstate as near ultraviolet type red phosphors

J. Yu, K. Huang, L. Yuan and S. Feng, New J. Chem., 2014, 38, 1441 DOI: 10.1039/C3NJ01096A

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