LIGHT-EMITTING ELEMENT

PROBLEM TO BE SOLVED: To provide an improved light emitting element having high efficiency, and having a sufficient service life even when used as illumination.SOLUTION: A light-emitting element comprises: an electrode 1; a counter electrode 2; and a light-emitting organic region 4. The light-emitti...

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Hauptverfasser: SVEN MURANO, SCHWARZ GREGOR, YANG BIRKENSTOCK, MARTIN PFEIFFER
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creator SVEN MURANO
SCHWARZ GREGOR
YANG BIRKENSTOCK
MARTIN PFEIFFER
description PROBLEM TO BE SOLVED: To provide an improved light emitting element having high efficiency, and having a sufficient service life even when used as illumination.SOLUTION: A light-emitting element comprises: an electrode 1; a counter electrode 2; and a light-emitting organic region 4. The light-emitting organic region 4 includes a light-emitting layer EM1 and a light-emitting layer EM2 which is further added. The light-emitting layer EM1 contains a fluorescent light emitting body for emitting light mainly in a blue or viridian spectral range by applying a voltage to the electrode 1 and the counter electrode 2. The light-emitting organic region 4 is arranged in a light-emitting form in which a plurality of colors in a visible spectrum range, optionally, including white are generated. The added light-emitting layer EM2 contains one or more phosphorescence light-emitting bodies for emitting light mainly in a spectrum range rather than blue. Triplet energy of the fluorescent light emitting body is greater than an energy level in a triplet energy state of the phosphorescence light-emitting body. The light-emitting organic region 4 emits at least 5% of light generated in the light-emitting organic region 4 as a fluorescent visible spectrum from the fluorescent light emitting body of the light-emitting layer EM1 in a singlet state.
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The light-emitting organic region 4 includes a light-emitting layer EM1 and a light-emitting layer EM2 which is further added. The light-emitting layer EM1 contains a fluorescent light emitting body for emitting light mainly in a blue or viridian spectral range by applying a voltage to the electrode 1 and the counter electrode 2. The light-emitting organic region 4 is arranged in a light-emitting form in which a plurality of colors in a visible spectrum range, optionally, including white are generated. The added light-emitting layer EM2 contains one or more phosphorescence light-emitting bodies for emitting light mainly in a spectrum range rather than blue. Triplet energy of the fluorescent light emitting body is greater than an energy level in a triplet energy state of the phosphorescence light-emitting body. 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subjects BASIC ELECTRIC ELEMENTS
ELECTRIC HEATING
ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
title LIGHT-EMITTING ELEMENT
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