Organic electroluminescence element and light emitting device employing the element
First Claim
1. An organic electroluminescence element, comprising:
- an anode layer;
a layer formed on said anode layer having a hole transport region and an electron transport region and having a surface for emitting light; and
a cathode layer formed on said layer having the hole transport and electron transport regions, said cathode layer having a major face which is perpendicular to the direction in which the three layers are stacked, wherein said major face has a surface area which is less than or equal to 0.025 cm2.
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Abstract
An organic electroluminescence (EL) element has a RC time constant of 100 ns or less. Specifically, the capacitance of an organic EL element is 500 PF or less and/or the area of the light-emitting surface of the organic EL element is 0.025 cm2 or less, while the electron transport time is 600 ns or less. On this manner, an organic EL element having a high response speed is obtained. An organic EL element having an extremely high speed may be obtained if the time constant of the organic EL element is 10 ns or less, both the hole transport time and the electron transport time is 40 ns or less and both the light emission rise complete time and the light emission decay complete time are 50 ns or less.
57 Citations
9 Claims
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1. An organic electroluminescence element, comprising:
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an anode layer; a layer formed on said anode layer having a hole transport region and an electron transport region and having a surface for emitting light; and a cathode layer formed on said layer having the hole transport and electron transport regions, said cathode layer having a major face which is perpendicular to the direction in which the three layers are stacked, wherein said major face has a surface area which is less than or equal to 0.025 cm2. - View Dependent Claims (2, 3, 4, 5)
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6. A light emitting device comprising:
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an organic electroluminescence element, said element including; an anode layer; a layer formed on said anode layer having a hole transport region and an electron transport region and having a surface for emitting light; a cathode layer formed on said layer having the hole transport and electron transport regions, said cathode layer having a major face which is perpendicular to the direction in which the three layer are stacked, and wherein said major face has a surface area which is less than or equal to 0.025 cm2 ; and a driving circuit having an RC time constant less than or equal to 100 ns. - View Dependent Claims (7)
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8. A series connection of a plurality of organic electroluminescence elements, each of said elements comprising:
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an anode layer; a layer formed on said anode layer having a hole transport region and an electron transport region and having a surface for emitting light; and a cathode layer formed on said layer having the hole transport and electron transport regions, said cathode layer having a major face which is perpendicular to the direction in which the three layers are stacked, wherein said major face has a surface area which is less than or equal to 0.025 cm2, an RC time constant of said series connection is less than or equal to 100 ns, and a charge transport time of each of said elements is less than or equal to 600 ns.
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9. A series connection of a plurality of organic electroluminescence elements, each of said elements comprising:
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an anode layer; a layer formed on said anode layer having a hole transport region and an electron transport region and having a surface for emitting light; and a cathode layer formed on said layer having the hole transport and electron transport regions, said cathode layer having a major face which is perpendicular to the direction in which the three layers are stacked, wherein said major face has a surface area which is less than or equal to 0.025 cm2, a total capacitance of the plurality of series connected elements is less than or equal to 500 picofarads, and a charge transport time of each of said elements is less than or equal to 600 ns.
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Specification