Polymer, and mixture or formulation, and organic electronic device containing same, and monomer thereof
Disclosed are a polymer, and a mixture or a formulation and an organic electronic device containing same, and applications thereof, and further a monomer of which the polymer is made; the polymer comprises on its side chain a repeating structure unit E, characterizing in that its S1(E)−T1(E))≤0.35 eV or even less, which may allow the said polymer having thermally activated delayed fluorescence (TADF) property. Thus a TADF polymer suitable for printing processes is provided, thereby reducing OLED manufacturing costs.
1. A polymer having the following general structural formula:
wherein E is a structural unit,
the energy difference between the singlet energy level and the triplet energy level of the structural unit E, i.e. (S1(E)−T1(E)), is less than or equal to 0.35 eV,
x and y are the molar fractions,
x+y=1, and
G is an organic functional group selected from the group consisting of a hole-injecting or hole-transporting group, a hole-blocking group, an electron-injecting or electron-transporting group, an electron-blocking group, an organic host group, a singlet emitter group, and a triplet emitter group.
2. The polymer according to claim 1 , wherein (S1(E)−T1(E))≤0.25 eV.
3. The polymer according to claim 1 , wherein the structural unit E contains at least one electron donating group D and at least one electron accepting group A.
4. The polymer according to claim 1 , wherein the structural unit E contains a structural unit represented by the structural formula (I):
where Ar is an aromatic or heteroaromatic structural unit,
D is an electron donating group,
A is an electron accepting group,
each of n and m is an integer between 1 and 6,
when m>1, each D is independently selected from the same or different electron donating groups, and
when n>1, each A is independently selected from the same or different electron accepting groups.
5. The polymer according to claim 3 , wherein the electron donating group D is selected from structural units containing any one of the following groups:
6. The polymer according to claim 3 , wherein the electron accepting group A is selected from the group consisting of F, cyano group, and structural units containing any one of the following groups:
wherein n1 is an integer from 1 to 3, X 1 -X 8 are CR 1 or N, at least one of X 1 -X 8 is N, and R 1 is selected from the group consisting of hydrogen, alkyl, alkoxy, amino, alkenyl, alkynyl, aralkyl, heteroalkyl, aryl, and heteroaryl.
7. The polymer according to claim 4 , wherein Ar is selected from structural units containing any one of the following groups:
where z is O or S.
8. The polymer according to claim 1 , wherein the structural unit E is selected from structural units containing any one of the following structural formulas:
9. A mixture, comprising:
the polymer according to claim 1 ; and
at least one organic functional material that is selected from the group consisting of a hole-injecting or hole-transporting material, a hole-blocking material, an electron-injecting or electron-transporting material, an electron-blocking material, an organic host material, a singlet emitter, and a triplet emitter.
10. The mixture according to claim 9 , wherein the at least one organic functional material is a singlet emitter or a triplet emitter.
11. A formulation comprising the polymer according to claim 1 and at least one organic solvent.