Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2001-03-30
2003-06-10
Kelly, Cynthia H. (Department: 1774)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S917000, C313S112000, C313S504000, C313S506000, C257S098000, C359S885000
Reexamination Certificate
active
06576352
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a color-converting film and a light-emitting apparatus using the same.
Self-emission type, high visible, light-emitting apparatuses usable for a lightweight thin display, etc. have been widely studied and developed in recent years. Particularly, attention has been paid to a light-emitting apparatus comprising an organic light-emitting device, which is advantageous in that its emission spectra can be easily controlled and that it can be driven by a low applying voltage.
Known as the multi-color (full-color) light-emitting apparatus using the organic light-emitting device are: (a) apparatuses where three types of light-emitting layers each acting to emit red, green or blue light are disposed on a substrate to form picture elements of the three colors (Japanese Patent Laid-Open Nos. 57-157487, 58-147989, 3-214593, 8-227276, etc.); (b) apparatuses where three types of color filters each acting to separate white light into red, green or blue light are provided on the light output side surface of a white light-emitting device (Japanese Patent Laid-Open Nos. 1-315988, 2-273496, 3-194895, 7-142169, etc.); (c) apparatuses where color-converting films each acting to convert blue light into red or green light are provided on the light output side surface of a blue light-emitting device to obtain three colors (Japanese Patent Laid-Open Nos. 3-152897, 8-279394, 8-286033, 9-80434, 9-92466, 9-208944, etc.); etc. However, the light-emitting apparatuses of above (a) demand complicated processes for disposing the three types of light-emitting layers on the substrate, to be poor in yield and mass-productivity. The light-emitting apparatuses of above (b) exhibit low light-emitting efficiency because most of light emitted therefrom is absorbed by the color filters, thereby requiring high applying voltage. The light-emitting apparatuses of above (c) also require high applying voltage because the conventional color-converting films are not always excellent in fluorescence conversion efficiency.
White light-emitting apparatuses have been conventionally used for illumination light sources, etc. However, such the conventional white light-emitting apparatuses that are described in publications recited as references for the apparatuses of (b) need a plurality of light-emitting materials, whereby color balance of light emission thereof is often changed over time.
OBJECT AND SUMMARY OF THE INVENTION
An object of the present invention is to provide a color-converting film excellent in fluorescence conversion efficiency, and a light-emitting apparatus comprising the color-converting film, which can be driven by a low applying voltage with high stability and can be easily produced with high yield.
As a result of intense research in view of the above object, the inventor has found that a color-converting film using an ortho-metallation complex is excellent in the fluorescence conversion efficiency, and that a light-emitting apparatus comprising the color-converting film and an organic light-emitting device can be driven by low applying voltage. The present invention has been accomplished by the findings.
Thus, a color-converting film of the present invention comprises a light-transmittable substrate and a color-converting layer containing an ortho-metallation complex disposed thereon.
The color-converting layer preferably contains a dye and/or a pigment, the dye being preferably selected from the group consisting of stilbene compounds, coumalin compounds, cyanine compounds, pyridine compounds, xanthine compounds, naphthalic imide compounds and oxazine compounds. The dye-content is preferably 0.1 to 20 weight % in the color-converting layer.
The ortho-metallation complex is preferably an iridium complex, a palladium complex or a platinum complex, particularly preferably an iridium complex. The ortho-metallation complex preferably includes at least one ligand selected from the group consisting of 2-phenyl pyridine derivatives, 7,8-benzoquinoline derivatives, 2-(2-thienyl)pyridine derivatives, 2-(1-naphthyl)pyridine derivatives and 2-phenylquinoline derivatives. The content of the ortho-metallation complex is preferably 0.1 to 99 weight % in the color-converting layer.
The color-converting film of the present invention preferably comprises a light-shielding layer. The light-shielding layer is preferably disposed on the upper surface or the lower surface of the light-transmittable substrate.
A light-emitting apparatus of the present invention comprises the above color-converting film, and an organic light-emitting device having a transparent electrode, an organic light-emitting layer and a counter electrode provided on the color-converting film. The light-emitting apparatus of the present invention is usable as a multi-color light-emitting apparatus or a white light-emitting apparatus.
REFERENCES:
patent: 6306347 (2001-10-01), Mason et al.
patent: 6310360 (2001-10-01), Forrest et al.
patent: 6403237 (2002-06-01), Noguchi et al.
patent: 3-152897 (1991-06-01), None
patent: 08-286033 (1996-01-01), None
patent: 8-279394 (1996-10-01), None
patent: 9-80434 (1997-03-01), None
patent: 9-092466 (1997-04-01), None
patent: 9-208944 (1997-08-01), None
Wilde, Ashley P. et al., Journal of Physical Chemistry (1991), 95(2), 629-34.*
Garces, F.O. et al., Inorganic Chemistry (1988), 27(20), 3464-71.
Burns Doane , Swecker, Mathis LLP
Fuji Photo Film Co. , Ltd.
Garrett Dawn
Kelly Cynthia H.
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