Thin film electroluminescent element easily regulating emitted light to white
First Claim
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1. A thin film electroluminescent element fabricated on a substrate comprising:
- an anode applied with an electric potential;
a cathode negatively biased with respect to said anode;
a photoluminescent medium provided between said anode and said cathode, and having a luminescent layer causing holes injected from said anode to be recombined with electrons injected from said cathode for emitting a first light in a first color through one of said anode and said cathode; and
a color changing medium formed over a surface of said one of said anode and said cathode, and containing a first photo-converting material for converting a part of said first light to a second light in a second color and a second photo-converting material for converting a part of said second light to a third light in a third color, thereby radiating a remaining part of said first light, a remaining part of said second light and said third light.
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Abstract
A thin film electroluminescent element has a color changing layer doped with green luminescent material and red fluorescent material and separated from an electroluminescent layer for generating blue light for converting the blue light to green light and the green light to red light, and the separation results in reduction of trapping center in the electroluminescent layer.
68 Citations
7 Claims
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1. A thin film electroluminescent element fabricated on a substrate comprising:
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an anode applied with an electric potential; a cathode negatively biased with respect to said anode; a photoluminescent medium provided between said anode and said cathode, and having a luminescent layer causing holes injected from said anode to be recombined with electrons injected from said cathode for emitting a first light in a first color through one of said anode and said cathode; and a color changing medium formed over a surface of said one of said anode and said cathode, and containing a first photo-converting material for converting a part of said first light to a second light in a second color and a second photo-converting material for converting a part of said second light to a third light in a third color, thereby radiating a remaining part of said first light, a remaining part of said second light and said third light. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification