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Improvement of Luminescent Properties of Phosphor Powders Coated with Nanoscaled SiO2 by Atomic Layer Deposition

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Abstract:

An investigation is reported by coating BaMgAl10O17:Eu2+ phosphor by silicon oxide using catalyzed atomic layer deposition. Nanoscaled SiO2 films were prepared at room temperature using tetraethoxysilane (TEOS), H2O and NH3 as precursors, reactant gas and catalyst, respectively. AES analysis showed the surface composition of coated phosphor was silicon oxide. In TEM and FE-SEM analysis, the growth rate was about 0.7 Å/cycle and the surface morphology became smoother and clearer than that of uncoated phosphor. The photoluminescence intensity (PL) increased up to 11.04% as ALD cycle increased up to 200 ALD cycle. This means that the reactive surface of uncoated phosphors is uniformly grown with stable silicon oxide to reduce the dead surface layer without change of bulk properties. Moreover, it is found that nanoscaled SiO2 films are quite effective for the improvement of the aging characteristics of photoluminescence.

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Periodical:

Solid State Phenomena (Volumes 124-126)

Pages:

375-378

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.124-126.375

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Online since:

June 2007

Authors:

Hyu Suk Kim, Hyug Jong Kim, Hyung Su Kim, Young Kyu Jeong, Suk Hwan Kim, Sang Woo Lee, Bong Kyo Jeong, Hyuoung Ho Lee, Byung Ho Choi

Keywords:

Atomic Layer Deposition (ALD), BAM Phosphor, Photoluminescence (PL), Silicon Oxide (SiO), TEOS

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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