Organic electroluminescence element and compound used therein

An organic electroluminescence element having an anode, a cathode, and at least one organic layer containing a light-emitting layer between the anode and the cathode, wherein the light-emitting layer contains a compound represented by the following general formula (1), which radiates delayed fluorescence:

• wherein, in the general formula (1), R1, R2, R3, R4, R5, R6, R7, R8 and R17 each independently represent a hydrogen atom or an electron-donating group, and at least one of R1, R2, R3, R4, R5, R6, R7, R8 or R17 is an electron-donating group;
• R9, R10, R11, R12, R13, R14, R15 and R16 each independently represent a hydrogen atom, or an electron-withdrawing group that does not have an unshared electron pair at the α-position thereof;
• Z represents >C═Y, and Y represents O or C(CN)2.

An organic electroluminescence element, wherein a compound represented by the following general formula (1) is used as a dopant in a light-emitting layer

• wherein, in the general formula (1), R1, R2, R3, R4, R5, R6, R7, R8 and R17 each independently represent a hydrogen atom or an electron-donating group, and at least one of R1, R2, R3, R4, R5, R6, R7, R8 or R17 is an electron-donating group;
• R9, R10, R11, R12, R13, R14, R15 and R16 each independently represent a hydrogen atom, or an electron-withdrawing group that does not have an unshared electron pair at the α-position thereof;
• Z represents >C═Y, and Y represents O or C(CN)2.

A compound represented by the following general formula (1′):

• wherein, in the general formula (1′), R1′, R2′, R3′, R4′, R5′, R6′, R7′, R8′, and R17′ each independently represent a hydrogen atom or an electron-donating group, and at least one of R1′, R2′, R3′, R4′, R5′, R6′, R7′, R8′ or R17′ is an electron-donating group;
• R9′, R10′, R11′, R12′, R13′, R14′, R15′ and R16′ each independently represent a hydrogen atom or a cyano group;
• Z′ represents >C═Y, and Y represents O or C(CN)2.

A delayed fluorescence emitter having a structure represented by the following general formula (1):

• wherein, in the general formula (1), R1, R2, R3, R4, R5, R6, R7, R8 and R17 each independently represent a hydrogen atom or an electron-donating group, and at least one of R1, R2, R3, R4, R5, R6, R7, R8 or R17 is an electron-donating group;
• R9, R10, R11, R12, R13, R14, R15 and R16 each independently represent a hydrogen atom, or an electron-withdrawing group that does not have an unshared electron pair at the α-position thereof;
• Z represents >C═Y, and Y represents O or C(CN)2.

A delayed fluorescence material comprising a compound represented by the following general formula (1′):

• wherein, in the general formula (1′), R1′, R2′, R3′, R4′, R5′, R6′, R7′, R8′ and R17′ each independently represent a hydrogen atom or an electron-donating group, and at least one of tR1′, R2′, R3′, R4′, R5′, R6′, R7′, R8′ or R17′ is an electron donating group;
• R9′, R10′, R11′, R12′, R13′, R14′, R15′ and R16′ each independently represent a hydrogen atom or a cyano group;
• Z′ represents >C═Y, and Y represents O or C(CN)2.

A light-emitting material comprising a compound represented by the following general formula (1):

• wherein, in the general formula (1), R1, R2, R3, R4, R5, R6, R7, R8 and R17 each independently represent a hydrogen atom or an electron-donating group, and at least one of R1, R2, R3, R4, R5, R6, R7, R8 or R17 is an electron-donating group;
• R9, R10, R11, R12, R13, R14, R15 and R16 each independently represent a hydrogen atom, or an electron-withdrawing group that does not have an unshared electron pair at the α-position thereof;
• Z represents >C═Y, and Y represents O or C(CN)2.