Journal of the Japan Society of Colour Material

Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X

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Volume 80, Issue 6

Displaying 1-5 of 5 articles from this issue

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Electronic Behavior of Calcined Material from a (Niobium-O-Phenylene-S) - (Cadmium-S-Phenylene-O) Hybrid Copolymer

Shin YAMAMOTO, Hideo MATSUI, Kosuke MATOBA, Subbian KARUPPUCHAMY, Masa ...

2007Volume 80Issue 6 Pages 241-245
Published: June 20, 2007
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.80.241

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The calcination of a (niobium-O-phenylene-S) - (cadmium-S-phenylene-O) hybrid copolymer under an argon atmosphere gave nano-sized Nb₂O₅ / carbon clusters / CdS hybrid material. ESR spectral examinations suggest the possibility of an electron transfer in the process of Nb₂O₅→carbon clusters→CdS→carbon clusters.

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Improvement of the External Quantum Efficiency of Lithium Europium Tungstate and its Application to White Light Emitting Diodes

Tsutomu ODAKI, Tsutomu TAKANO, Kazuaki HASHIMOTO, Yoshitomo TODA

2007Volume 80Issue 6 Pages 246-252
Published: June 20, 2007
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.80.246

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In order to improve the quantum efficiency of the red phosphor LiEu_0.96Sm_0.04W₂O₈ under 395 nm excitation, we synthesized samples having various particle sizes. We investigated the emission properties of near UV-pumped white LEDs containing this red phosphor. At room temperature, the external quantum efficiency improved to 49.4 % as the particle size increased, a value comparable to that of commercialized green and blue phosphors used in n-UV LEDs.
In a white LED fabricated by combining an n-UV LED with RGB phosphors, including our synthesized LiEu_0.96Sm_0.04W₂O₈, the luminance of an LED with a red phosphor particle size of 183μm was 1.6 times higher than that with a particle size of 21.7μm. The color rendering properties showed excellent uniformity : there was no observable correlation between color rendering properties and particle size. We consider that an emission peak at 614 nm had a beneficial effect on the luminance and color rendering properties of a white light LED.

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Paper-Like Display by Using Electronic Liquid Powder

Itsuo TANUMA, Yoshitomo MASUDA, Ryo SAKURAI

2007Volume 80Issue 6 Pages 253-257
Published: June 20, 2007
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.80.253

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Blister Formation of Electrodeposition Paint and Viscoelastic Analysis on Cure Process

Masahide KAWARAYA

2007Volume 80Issue 6 Pages 258-266
Published: June 20, 2007
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.80.258

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Functionalization of Nanoparticles by Grafting of Polymers

Norio TSUBOKAWA

2007Volume 80Issue 6 Pages 267-276
Published: June 20, 2007
Released on J-STAGE: November 20, 2012

DOIhttps://doi.org/10.4011/shikizai1937.80.267

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