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Title: Morphology control and luminescent property of Y{sub 3}Al{sub 5}O{sub 12}:Tb particles prepared by spray pyrolysis

Abstract

A spray pyrolysis process was used to prepare spherical yttrium aluminum garnet (Y{sub 3}Al{sub 5}O{sub 12}:Tb) phosphor particles with enhanced luminescence properties. The aim of the process was to improve the morphology and luminescent intensity of the Y{sub 3}Al{sub 5}O{sub 12}:Tb phosphor particles by modifying the precursor solution. The particles produced from a nitrate aqueous solution were spherical with a hollow structure that was deformed by the post treatment at 1400 deg. C. To avoid the hollowness, the nitrate solution was modified by the addition of an NH{sub 4}OH solution so that a polycation solution could be obtained. Compared with the hollow particles prepared from the nitrate aqueous solution, the Y{sub 3}Al{sub 5}O{sub 12}:Tb particles with the spherical morphology and nonaggregated structure, even after the post treatment, were successfully prepared and found to have an improved photoluminescence and cathodoluminescence intensity.

Authors:
 [1];  [2];  [3]
  1. Advanced Materials Division, Korea Research Institute of Chemical Technology, 100 Jang-dong, Yuseong-gu, Daejeon 305-343 (Korea, Republic of). E-mail: kyjung@krict.re.kr
  2. Advanced Materials Division, Korea Research Institute of Chemical Technology, 100 Jang-dong, Yuseong-gu, Daejeon 305-343 (Korea, Republic of)
  3. Department of Chemical Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701 (Korea, Republic of)
Publication Date:
OSTI Identifier:
20889818
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 40; Journal Issue: 12; Other Information: DOI: 10.1016/j.materresbull.2005.06.007; PII: S0025-5408(05)00236-9; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; AMMONIUM HYDROXIDES; AQUEOUS SOLUTIONS; CATHODOLUMINESCENCE; GARNETS; MORPHOLOGY; NITRATES; PHOTOELECTRON SPECTROSCOPY; PHOTOLUMINESCENCE; PYROLYSIS; SPRAYS; YTTRIUM

Citation Formats

Jung, Kyeong Youl, Lee, Dong Youl, and Kang, Yun Chan. Morphology control and luminescent property of Y{sub 3}Al{sub 5}O{sub 12}:Tb particles prepared by spray pyrolysis. United States: N. p., 2005. Web. doi:10.1016/j.materresbull.2005.06.007.
Jung, Kyeong Youl, Lee, Dong Youl, & Kang, Yun Chan. Morphology control and luminescent property of Y{sub 3}Al{sub 5}O{sub 12}:Tb particles prepared by spray pyrolysis. United States. doi:10.1016/j.materresbull.2005.06.007.
Jung, Kyeong Youl, Lee, Dong Youl, and Kang, Yun Chan. Thu . "Morphology control and luminescent property of Y{sub 3}Al{sub 5}O{sub 12}:Tb particles prepared by spray pyrolysis". United States. doi:10.1016/j.materresbull.2005.06.007.
@article{osti_20889818,
title = {Morphology control and luminescent property of Y{sub 3}Al{sub 5}O{sub 12}:Tb particles prepared by spray pyrolysis},
author = {Jung, Kyeong Youl and Lee, Dong Youl and Kang, Yun Chan},
abstractNote = {A spray pyrolysis process was used to prepare spherical yttrium aluminum garnet (Y{sub 3}Al{sub 5}O{sub 12}:Tb) phosphor particles with enhanced luminescence properties. The aim of the process was to improve the morphology and luminescent intensity of the Y{sub 3}Al{sub 5}O{sub 12}:Tb phosphor particles by modifying the precursor solution. The particles produced from a nitrate aqueous solution were spherical with a hollow structure that was deformed by the post treatment at 1400 deg. C. To avoid the hollowness, the nitrate solution was modified by the addition of an NH{sub 4}OH solution so that a polycation solution could be obtained. Compared with the hollow particles prepared from the nitrate aqueous solution, the Y{sub 3}Al{sub 5}O{sub 12}:Tb particles with the spherical morphology and nonaggregated structure, even after the post treatment, were successfully prepared and found to have an improved photoluminescence and cathodoluminescence intensity.},
doi = {10.1016/j.materresbull.2005.06.007},
journal = {Materials Research Bulletin},
number = 12,
volume = 40,
place = {United States},
year = {Thu Dec 08 00:00:00 EST 2005},
month = {Thu Dec 08 00:00:00 EST 2005}
}
  • Undoped and Eu-doped yttrium aluminum garnet nano-powders were prepared by a facile combustion method with citric acid/ethylene diamine tetraacetic acid (EDTA) as fuels and nitrates as oxidizers. The precursors and powders calcined at 1030 {sup o}C were investigated using thermogravimetric (TG), differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscope (SEM), and Brunauer-Emmett-Teller (BET) surface area measurements. It was found that the powders could be indexed with a garnet structure. The grains were in shape of hemispherical with sizes between 60 nm and 100 nm. With decreasing the citric acid/EDTA ratio, the crystallite size decreased steadily and the specificmore » surface area increased. Investigations of photoluminescence (PL) revealed that as-synthesized YAG:Eu{sup 3+} phosphor samples exhibited an orange emission band with a main peak at 591 nm under the excitation of 394 nm. As citric acid amounts increased, the quality of crystallinity became higher and the luminescent properties were monotonously enhanced.« less
  • Autoclaving the rare-earth nitrate/NH{sub 4}OH reaction system under the mild conditions of 120-200 Degree-Sign C and pH 6-13 have yielded four types of well-crystallized compounds with their distinctive crystal shapes, including Ln{sub 2}(OH){sub 5}NO{sub 3}{center_dot}nH{sub 2}O (Ln=Y and Eu) layered rare-earth hydroxide (hexagonal platelets), Ln{sub 4}O(OH){sub 9}NO{sub 3} oxy-hydroxyl nitrate (hexagonal prisms and microwires), Ln(OH){sub 2.94}(NO{sub 3}){sub 0.06}{center_dot}nH{sub 2}O hydroxyl nitrate (square nanoplates), and Ln(OH){sub 3} hydroxide (spindle-shaped microrods). The occurrence domains of the compounds are defined. Ammonium nitrate (NH{sub 4}NO{sub 3}) as a mineralizer effectively widens the formation domains of the NO{sub 3}{sup -} containing compounds while leads tomore » larger crystals at the same time (up to 0.3 mm). Crystallization mechanisms of the compounds and the effects of NH{sub 4}NO{sub 3} were discussed. Optical properties (PLE/PL) of the four phases were characterized in detail and were interpreted from the different site symmetries of Eu{sup 3+}. The compounds convert to cubic-structured (Y{sub 0.95}Eu{sub 0.05}){sub 2}O{sub 3} by annealing at 600 Degree-Sign C while retaining their original crystal morphologies. The resultant phosphor oxides of diverse particle shapes exhibit differing optical properties, in terms of luminescent intensity, asymmetry factor of luminescence and fluorescence lifetime, and the underlying mechanism was discussed. - Graphical abstract: Well-defined crystallites of the various phases have been autoclaved from the nitrate/NH{sub 4}OH reaction system. Crystallization mechanisms of the compounds and the effects of NH{sub 4}NO{sub 3} were discussed. Highlights: Black-Right-Pointing-Pointer Well-defined crystallites of four phases have been hydrothermally synthesized. Black-Right-Pointing-Pointer The occurrence domains of the compounds are defined. Black-Right-Pointing-Pointer Crystallization mechanisms and the effects of NH{sub 4}NO{sub 3} mineralizer are discussed. Black-Right-Pointing-Pointer PL properties of the compounds and their calcination products are studied.« less
  • Eu{sup 3+}/Tb{sup 3+} singly and co-doped Y{sub 3}Al{sub 5}O{sub 12} (YAG) phosphors were synthesized by the modified sol-gel method. The prepared phosphors were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscope (FE-SEM) and luminescence analysis. Cubic YAG formation was confirmed by XRD. A strong characteristic emission from Eu{sup 3+} and Tb{sup 3+} ions was identified and the influence of doping concentration was studied. Energy transfer mechanism was observed from Tb{sup 3+} to Eu{sup 3+} ions in the co-doped phosphor. The CIE co-ordinates cover orange-red to green with increasing the Tb{sup 3+}ion concentration.
  • Thin-film Y{sub 3{minus}x}Al{sub 5}O{sub 12}:Tb{sub x}{sup 3+} (YAG:Tb) phosphor derived from a sol-gel chemistry is analyzed by x-ray diffraction, scanning electron microscopy, photoluminescence (PL) and cathodoluminescence (CL). The metal alkoxides organic precursors were chosen as the starting materials to form the sol-gel. This liquid sol-gel was spin coated on sapphire and silicon substrates to form the uniform thin films, then crystallized by annealing. The PL intensity of the crystallized film at 545 nm green emission was 15 times higher than that of the as-coated noncrystalline film. CL measurements show that luminance and efficiency are comparable to the films deposited bymore » other techniques. {copyright} 2001 American Institute of Physics.« less
  • The luminescence efficiency of the YAG:Tb phosphor has been improved by the application of BaF/sub 2/ flux to the firing process. Luminescence efficiency is largely determined by the single-phase crystallinity of cubic YAG:Tb. This phosphor, when used in a projection CRT, show good stability in the temperature and current dependence of brightness as well as good resistance to electron burning. The effect of BaF/sub 2/ on the formation of single-phase cubic YAG and the optical performance of the resulting YAG:Tb phosphor in a CRT are discussed.