Organic electroluminescence element
AssigneeFUJIFILM Corporation
InventorsMasaru Kinoshita, Manabu Tobise
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Abstract
An organic electroluminescence element includes at least a light-emitting layer between a pair of electrodes, wherein the light-emitting layer is divided into at least three layers, an intermediate layer containing an electron blocking material or a hole blocking material is disposed between the divided light-emitting layers, an Ea value of the electron blocking material is smaller than an Ea value of a host material of the divided light-emitting layer adjacent on a cathode side or an Ip value of the hole blocking material is larger than an Ip value of a host material of the divided light-emitting layer adjacent on the anode side of the intermediate layer, and a difference of ΔEa or ΔIp is controlled to specific range.
Claims10
An organic electroluminescence element comprising at least a light-emitting layer interposed between a pair of electrodes, wherein:
- 1) the light-emitting layer is divided into at least three layers in a thickness direction thereof, wherein each of the divided light-emitting layers independently contains a light-emitting material and a host material, and an intermediate layer containing an electron blocking material is disposed between the divided light-emitting layers;
- 2) an Ea (electron affinity) value of the electron blocking material contained in the intermediate layer is smaller than an Ea value of the host material contained in the divided light-emitting layer adjacent on a cathode side of the intermediate layer;
- and
- 3) a difference ΔEa2 value between an Ea value of the electron blocking material contained in the intermediate layer closer to the anode and an Ea value of a host material contained in the divided light-emitting layer adjacent on the cathode side thereof is larger than a difference ΔEa1 value between an Ea value of the electron blocking material contained in the intermediate layer closer to the cathode and an Ea value of the host material contained in the divided light-emitting layer adjacent on the cathode side of the intermediate layer.
An organic electroluminescence element comprising at least a light-emitting layer interposed between a pair of electrodes, wherein:
- 1) the light-emitting layer is divided into at least three layers in a thickness direction thereof, wherein each of the divided light-emitting layers independently contains a light-emitting material and a host material, and an intermediate layer containing a hole blocking material is disposed between the divided light-emitting layers;
- 2) an Ip (ionization potential) value of the hole blocking material contained in the intermediate layer is larger than an Ip value of the host material contained in the divided light-emitting layer adjacent on an anode side of the intermediate layer;
- and
- 3) a difference ΔIp2 value between an Ip value of the hole blocking material of the intermediate layer closer to the anode and an Ip value of the host material contained in the divided light-emitting layer adjacent to the anode side thereof is smaller than a difference ΔIp1 value between an Ip value of the hole blocking material of the intermediate layer closer to the cathode and an Ip value of the host material contained in the divided light-emitting layer adjacent to the anode side of the intermediate layer.
Dependencies are inferred from the claim text.