Dendrimers containing luminescent platinum(II) compounds for organic light-emitting devices and their preparation
AssigneeThe University of Hong Kong
InventorsVivian Wing-Wah Yam, Ka-Wai Kong, Man-Chung Tang, Mei-Yee Chan
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Abstract
Disclosed is a class of dendrimers containing cyclometalated tridentate platinum(II) compounds with one monoanionic auxiliary ligand, both coordinated to a platinum (II) metal center and having the chemical structure shown in generic formula (I), wherein at least one of R1, R2 and R3 being a dendrimeric moiety of general formula (II), each being optionally substituted.
Claims12
A luminescent dendrimer comprising a cyclometalated tridentate platinum (II) compound comprising one monoanionic auxiliary ligand and a tridentate ligand coordinated to a platinum (II) metal center and having the chemical structure represented by the following general formula (I),
- wherein
- (a) X, Y and Z are cyclic structures;
- (b) any combinations of the rings X, Y and Z can be fused together with each other or the rings X, Y and Z can be non-fused with each other;
- (c) R1, R2 and R3 are the same or different and independently selected from hydrogen, alkyl, alkenyl, alkynyl, alkylaryl, cycloalkyl, OR, NR2, SR, C(O)R, C(O)OR, C(O)NR2, CN, CF3, NO2, SO2, SOR, SO3R, halo, aryl, heteroaryl, heterocyclic group or a dendrimeric moiety of general formula (II), wherein R is independently alkyl, alkenyl, alkynyl, alkyaryl, aryl or cycloalkyl, with at least one of R1, R2, and R3 being a dendrimeric moiety of general formula (II), each being optionally substituted;
- wherein:
- (i) Unit A in general formula (II) is the central part of the dendron and the branching point of the dendrimer;
- and
- (ii) Unit B in general formula (II) is the surface groups or dendron of the dendrimer, or none;
- and
- (d) R4 is selected from the following:
A light-emitting device with an ordered structure comprising an anode, a hole-transporting layer, a light-emitting layer, an electron-transporting layer and a cathode, wherein the light-emitting layer comprises a platinum (II) compound having a chemical structure represented by the following general formula (I),
- wherein X and Y are independently selected from pyridine, imidazole, benzimidazole, naphthoimidazole, quinoline, isoquinoline, quinoxaline, pyrimidine, pyrazine, pyrazole, triazole, tetrazole, pyridazine, triazine, tetrazine, triazole, indole, oxazole, isoxazole, isothiazole, benzothiazole and benzoxazole, each being optionally substituted;
- Z is selected from benzene, naphthalene, anthracene, pyrene, fluorene, pyrene, pyridine, imidazole, benzimidazole, naphthoimidazole, quinoline, isoquinoline, quinoxaline, pyrimidine, pyrazine, pyrazole, triazole, tetrazole, pyridazine, triazine, tetrazine, triazole, indole, oxazole, isoxazole, isothiazole, benzothiazole, benzoxazole, thiophene, furan, benzofuran and dibenzofuran, each being optionally substituted;
- R1, R2 and R3 are the same or different and independently selected from hydrogen, alkyl alkenyl, alkynyl, alkylaryl, cycloalkyl, OR, NR2, SR, C(O)R, C(O)OR, C(O)NR2, CN, CF3, NO2, SO2, SOR, SO3R, halo, aryl, heteroaryl, heterocyclic group or a dendrimeric moiety of general formula (II), wherein R is independently alkyl, alkenyl, alkynyl, alkylaryl, aryl, cycloalkyl, or dendrimeric moieties of general formula (II), each being optionally substituted, with at least one of R1, R2, and R3 being a dendrimeric moiety of general formula (II);
- wherein:
- (i) Unit A in general formula (II) is the central part of the dendron and the branching point of the dendrimer;
- and
- (ii) Unit B in general formula (II) is the surface groups or dendron of the dendrimer, or none;
- and
- wherein R4 is selected from the following:
Dependencies are inferred from the claim text.