Kyushu University

Kyulux, Inc.

Koala Tech Inc.

Taro Furukawa

Chihaya Adachi

Hajime Nakanotani

Takahiro Higuchi

An organic electroluminescent device having an anode, a cathode, and a light emitting layer between the anode and the cathode, in which the light emitting layer contains a first organic compound, a second organic compound, and a third organic compound that satisfy the following expression (A), the second organic compound is a delayed fluorescent material, and the third organic compound is a light emitting material, is capable of enhancing the light emission efficiency. E(A), E(B) and E(C) represent a lowest, singlet excitation energy level of the first, second and third organic compound, respectively.E(A)>E(B)>E(C)  (A)

Organic electroluminescent device

An organic electroluminescent device having an anode, a cathode, and a light emitting layer between the anode and the cathode, in which the light emitting layer contains a first organic compound, a second organic compound, and a third organic compound that satisfy the following expression (A), the second organic compound is a delayed fluorescent material, and the third organic compound is a light emitting material, is capable of enhancing the light emission efficiency. E(A), E(B) and E(C) represent a lowest singlet excitation energy level of the first, second and third organic compound, respectively.()&#x3e;()&#x3e;()&#x2003;&#x2003;(A)

An organic electroluminescent device having a donor layer containing a donor compound, a spacer layer containing a spacer compound, and an acceptor layer containing an acceptor compound in that order, wherein the donor compound and the acceptor compound are compounds to form an exciplex to radiate delayed fluorescence, and the excited triplet energy of the spacer compound is higher than the excited triplet energy of the exciplex, can be controlled to have different emission wavelengths not requiring change of the combination of the donor compound and the acceptor compound therein.

Organic electroluminescent device, device array, method for producing organic electroluminescent device, method for controlling emission wavelength of organic electroluminescent device

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Fukuoka, Japan

Taro Furukawa