Multiple Color Inorganic Thin-Film Phosphor, RE-Doped Amorphous Gallium Oxide (RE = Rare Earth: Pr, Sm, Tb, and Dy), Deposited at Room Temperature
- Author(s)
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Watanabe, Naoto, Ide, Keisuke, Kim, Junghwan, Katase, Takayoshi, Hiramatsu, Hidenori, Hosono, Hideo, Kamiya, Toshio
- Issued Date
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2019-03
- DOI
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10.1002/pssa.201700833
- URI
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https://scholarworks.unist.ac.kr/handle/201301/62092
- Citation
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, v.216, no.5, pp.1700833
- Abstract
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Multi-color inorganic thin-film phosphors are deposited at room temperature on glass substrates using ultra-wide bandgap amorphous gallium oxide (a-GO) as a host material. All of the a-GO films doped with four kinds of rare-earth ions (a-GO:REx) emit visible light, originating from the RE ions, by 238-257 nm ultraviolet light excitation; that is, blue & red emission from RE = Pr3+, red from Sm3+, green from Tb3+, and blue and yellow from Dy3+. The a-GO:Pr-x and a-GO:Tb-x films emit bright light clearly visible by human eyes. Although the internal quantum efficiencies of unannealed a-GO:Pr-0.02 and a-GO:Tb-0.02 films are 0.2 and 1.8%, respectively, those are improved to 2.4 and 3.8 %, respectively, by post-deposition thermal annealing in O-2 at 400 degrees C through desorption of weakly-bonded oxygen and structural relaxation. On the other hand, the annealing temperature to improve photoluminescence is limited by crystallization (onset temperatures 400-500 degrees C).
- Publisher
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WILEY-V C H VERLAG GMBH
- ISSN
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1862-6300
- Keyword (Author)
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amorphous oxide semiconductor, gallium oxide, rare earth, thin-film phosphor
- Keyword
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TERBIUM(III), PHOTOLUMINESCENCE, EUROPIUM(III), LUMINESCENCE
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