Luminescent characteristics in blue-emitting Bi-activated multicomponent oxide phosphor thin films

Minami, Tadatsugu; Miyata, Toshihiro; Ishino, Jun-ichi; Sahara, Keiichi

doi:doi:10.1116/1.3363942

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Journal of Vacuum Science & Technology B / Volume 28 / Issue 2 / PAPERS FROM THE 22nd INTERNATIONAL VACUUM NANOELECTRONICS CONFERENCE / Materials

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J. Vac. Sci. Technol. B 28, C2B56 (2010); http://dx.doi.org/10.1116/1.3363942 (6 pages)

Luminescent characteristics in blue-emitting Bi-activated multicomponent oxide phosphor thin films

Tadatsugu Minami, Toshihiro Miyata, Jun-ichi Ishino, and Keiichi Sahara

Optoelectronic Device System R&D Center, Kanazawa Institute of Technology, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan

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(Published online 31 March 2010)

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The luminescent characteristics in developed blue-emitting Bi-activated multicomponent oxide phosphor thin films that are composed of various combinations of La₂O₃, Y₂O₃, and Gd₂O₃ as the host material are investigated; ((La₂O₃)_1−X–(Gd₂O₃)_X):Bi, (Gd₂O₃)_1−Y–(Y₂O₃)_Y):Bi, and ((Y₂O₃)_1−Z–(La₂O₃)_Z):Bi phosphor thin films were prepared on thick BaTiO₃ ceramic sheets by either a conventional or a combinatorial rf magnetron sputtering deposition method using a powder target. The resulting phosphor thin films, which were prepared with various chemical compositions and postannealed above about 800 °C in an Ar gas atmosphere, all exhibited photoluminescent (PL) and electroluminescent (EL) emissions. However, the PL emission spectra observed from these phosphor thin films were considerably affected by the ultraviolet (UV) light used in the excitation. Intensive blue PL emissions were obtained in all of the phosphor thin films that were postannealed at 1050 °C and excited by an appropriate UV light. In comparison with the PL emission spectra, the EL emission spectra observed from thin-film electroluminescent (TFEL) devices fabricated using the Bi-activated multicomponent oxide phosphor thin films as the emitting layer exhibited a redshift of the emission band or an emergence of a new emission band accompanied by spectral broadening at longer wavelengths. In addition, high-luminance blue-green EL emissions were obtained in TFEL devices fabricated using the above phosphor thin films and driven by a sinusoidal wave ac voltage at 1 kHz.

ACKNOWLEDGMENTS

The authors wish to acknowledge H. Fukada for fruitful discussion. The authors also wish to acknowledge Y. Mizoguchi and T. Shimizu for their technical assistance in the experiments. This work was partially supported by Grant-in-Aid for Scientific Research No. 21560728 from the Ministry of Education, Science and Culture of Japan.

Article Outline

INTRODUCTION
EXPERIMENT
RESULTS AND DISCUSSION
1. Composition dependencies of PL characteristics
2. Composition dependencies of EL characteristics
CONCLUSIONS

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KEYWORDS and PACS

Keywords

annealing, barium compounds, bismuth, ceramics, electroluminescence, gadolinium compounds, lanthanum compounds, phosphors, photoluminescence, red shift, spectral line broadening, sputtered coatings, thin films, yttrium compounds

PACS

78.55.Hx

Other solid inorganic materials
78.66.Nk

Insulators
81.15.Cd

Deposition by sputtering
78.60.Fi

Electroluminescence

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History

Received 11 September 2009
Accepted 22 February 2010
Published online 31 March 2010

Digital Object Identifier

http://dx.doi.org/10.1116/1.3363942

PUBLICATION DATA

ISSN

1071-1023 (print)

1520-8567 (online)

Publisher

American Vacuum Society

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