Fluorescence-reddening membrane and red-emitting device using same
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United States of America Patent
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Sep 24, 2002
Grant Date -
Jul 12, 2001
app pub date -
Jan 3, 2001
filing date -
Feb 9, 1996
priority date (Note) -
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Abstract
The present invention relates to a fluorescence-reddening membrane which comprises a light-transmittable medium and, dispersed therein, (a) a rhodamine base fluorescence pigment and (b) a fluorescence pigment which has absorptions in the blue region and induces energy transfer to and reabsorptions from the rhodamine base fluorescence pigment. According to the present invention, it is made possible to provide the fluorescence-reddening membrane capable of converting the color of light emitted by a blue-emitting organic electroluminescence device to a red light at a high conversion efficiency and also to provide an inexpensive red-emitting device capable of reducing the size and thickness of itself.
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