Π(PI)-conjugated compound, organic electroluminescence element material, light-emitting material, light-emitting thin film, organic electroluminescence element, display device, and illumination device
In order to provide a novel π-conjugated compound capable of increasing the light-emission efficiency of an organic electroluminescence element, for example, this π-conjugated compound has a structure indicated by general formula (1). (In general formula (1): Z 1 -Z 6 each independently indicate a hydrogen atom, a deuterium atom, an electron-donating group D, or an electron-withdrawing group A; at least out of two among Z 1 -Z 6 is an electron-donating group D and the other is an electron-withdrawing group A; and at least one ortho position combination Z 1 and Z 2 , Z 2 and Z 3 , Z 3 and Z 4 , Z 4 and Z 5 , Z 5 and Z 6 , or Z 6 and Z 1 among Z 1 -Z 6 is one combination out of an electron-donating group D and an electron-donating group D, an electron-withdrawing group A and an electron-withdrawing group A, or an electron-donating group D and an electron-withdrawing group A.)
1. A π-conjugated compound comprising a structure represented by the following general formula (30):
wherein
D 1 to D 3 each independently comprise a group selected from a phenyl group substituted by an electron-donating group, an optionally substituted 9,10-dihydroacridyl group, an optionally substituted phenoxazyl group, an optionally substituted phenothiazyl group, an optionally substituted 5,10-dihydrophenazyl group, an optionally substituted diphenylamino group, and an optionally substituted dialkylamino group, and
A 2 comprises a group selected from an aryl group substituted by a cyano group, an unsubstituted nitrogen-containing aromatic six-membered ring group, a nitrogen-containing aromatic six-membered ring group substituted by a fluorine atom, a nitrogen-containing aromatic six-membered ring group substituted by a cyano group, a nitrogen-containing aromatic six-membered ring group substituted by a fluorine-substituted alkyl group, and a nitrogen-containing aromatic six-membered ring group substituted by an optionally substituted aryl group.
2. The π-conjugated compound according to claim 1 , wherein D 1 =D 2 =D 3 in general formulas (30) are satisfied.
3. The π-conjugated compound according to claim 1 , wherein the absolute value of the energy difference between the lowest singlet excited level and the lowest triplet excited level ΔE ST , is 0.50 eV or less.
4. An organic electroluminescent element material comprising the π-conjugated compound according to claim 1 .
5. A light-emitting material comprising the π-conjugated compound according to claim 1 , wherein the π-conjugated compound emits fluorescence.
6. An organic electroluminescent element comprising an anode, a cathode, and an organic layer disposed between the anode and the cathode,
wherein the organic layer substantially comprises a π-conjugated compound represented by general formula 206 or 207:
wherein
Z 1 and Z 2 are each an optionally substituted aryl group.
7. An organic electroluminescent element comprising an anode, a cathode, and an organic layer disposed between the anode and the cathode,
wherein the organic layer substantially comprises a π-conjugated compound represented general formula 208:
wherein
D 1 to D 3 are each an optionally substituted amino group.
8. The π-conjugated compound according to claim 1 , comprising a structure represented by the following general formula 207:
wherein Z 1 and Z 2 are each an optionally substituted aryl group.