DocumentCode :
1368287
Title :
Effect of polyethylene glycol on luminescence properties and morphologies of BaAl2Si2O8:Eu2+ phosphors
Author :
MingXing Ma ; Dachuan Zhu ; Mingjing Tu
Author_Institution :
Coll. of Mater. Sci. & Eng., Sichuan Univ., Chengdu, China
Volume :
6
Issue :
10
fYear :
2011
fDate :
10/1/2011 12:00:00 AM
Firstpage :
840
Lastpage :
840
Abstract :
Eu2+-doped BaAl2Si2O8 blue phosphor was prepared by the one-step calcination process of the chemical coprecipitation method. The phase structure, luminescence properties and morphologies of the samples were investigated by X-ray powder diffraction, fluorescence spectrophotometer and scanning electron microscopy, respectively. A tiny amount of BaAl2O4 phase was detected after adding polyethylene glycol (PEG) in precursor solution. The emission intensity increased with increasing PEG concentration at the beginning, and then decreased owing to the adverse enhancement of impurity phase and concentration quenching of Eu2+ ions resulted from addition of PEG. The emission peak position of the sample with 4 wt% PEG has a blue-shift compared with the other concentrations, which is attributed to Eu2+ emission mainly influenced by the Nephelanxetic effect. The morphology of particles changed from platelet or block to subglobular with increasing PEG concentration because PEG changed a nucleation process of crystal and gave rise to steric hindrance effect.
Keywords :
X-ray diffraction; aluminium compounds; barium compounds; calcination; europium; fluorescence; nucleation; phosphors; polymers; quenching (thermal); scanning electron microscopy; spectral line shift; BaAl2Si2O8:Eu; Eu2+ emission; Eu2+ ion concentration quenching; Eu2+-doped BaAl2Si2O8 blue phosphor; Nephelanxetic effect; PEG concentration; X-ray powder diffraction; blue shift; chemical coprecipitation method; emission intensity; fluorescence spectrophotometer; impurity phase; luminescence property; nucleation process; one-step calcination process; phase structure; polyethylene glycol; precursor solution; scanning electron microscopy; steric hindrance effect;
fLanguage :
English
Journal_Title :
Micro & Nano Letters, IET
Publisher :
iet
ISSN :
1750-0443
Type :
jour
DOI :
10.1049/mnl.2011.0237
Filename :
6069681
Link To Document :
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