ORGANIC LIGHT EMITTING DIODES AND ORGANIC LIGHT EMITTING DEVICES
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United States of America Patent
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Issued Date -
Jul 4, 2024
app pub date -
Sep 21, 2023
filing date -
Dec 22, 2022
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Abstract
An organic light emitting diode (OLED) and an organic light emitting device including the OLED (e.g., a display device or a lighting device) are disclosed herein. An emissive layer disposed between two electrodes includes a charge control layer with controlled hole mobility and/or a HOMO energy level between a red emitting material layer and a blue emitting material layer. The blue luminous efficiency can be improved and exciton recombination zone is formed within an emitting material layer by injecting holes and electrons into the emitting material layer in balance. As the luminous efficiency of red and blue lights is controlled in balance, beneficial blue luminous efficiency and excellent red luminous efficiency can be realized.
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