National Taiwan Ocean University Institutional Repository:Item 987654321/49938
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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/49938

Title: Preparation and Characterization of Blue-Light-Excited Nanophosphors Using an Economically Low-Energy Process
Authors: Horng-Yi Chang
Chen-Yu Wu
Kuocheng Huang
Yunshan Lo
Iwen Shen
Hsingchia Wang
Contributors: 國立臺灣海洋大學:輪機工程學系
Date: 2014-06
Issue Date: 2018-09-04T01:38:54Z
Publisher: Journal of Alloys and Compounds
Abstract: Abstract: Spherical and red nanophosphors of Y2O3:Eu3+ are prepared using urea hydrolysis that needs a long coprecipitation time (>4 h) and post-annealing at 800 °C for 2 h. Three microwave (MW) processing routes of MW-urea hydrolysis, MW-urea-EG solvolysis, and MW-urea-EG + KOH solvolysis were used to achieve short processing time and low energy consumption, thus obtaining high photoluminescence (PL) efficiency. The organic ethylene glycol (EG) solvent could prevent the nanoparticle surface from developing defects and provide a high-temperature bath for homogeneous nucleation and activator homogenization through rapid microwave volume heating. The 611 nm red emission of MW-urea-EG + KOH-derived phosphors excited by 466 nm was higher than that of the MW-urea-EG-derived phosphors after post-heat treatment at 600 °C. The pre-crystallized structure may have formed during microwave heating in EG + KOH system, but the amorphous structure formed in the EG system. The low power (100 W for 3.5 min) of the MW-urea-EG + KOH process economically reduced the post-heating temperature to 600 °C, and maintained the nano-size of phosphors with a high PL intensity. The residual hydroxyl and carbonyl groups on the obtained nanophosphors may be beneficial to be as chemical grafting in subsequent paste/slurry regulation for various LED and FPD applications.
Relation: 598 pp.217-223
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/49938
Appears in Collections:[Department of Marine Engineering] Periodical Articles

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