Polymer for organic electroluminescent element, and organic electroluminescent element using the same
View Patent ↗Provided are a polymer for an organic electroluminescent element, which improves light emission efficiency of the element and is applicable to a wet process, and an organic electroluminescent element, which is obtained using the polymer. The polymer for an organic electroluminescent element includes a repeating unit represented by the following general formula (1) in a repeating unit constituting a main chain. Further, the organic electroluminescent element includes organic layers between an anode and a cathode laminated on a substrate, in which at least one of the organic layers includes the polymer for an organic electroluminescent element, including an indolocarbazole skeleton in the repeating unit constituting a main chain. In the general formula (1), Z represents an N-indolocarbazolyl group, W represents a charge transporting group, m and n represent molar ratios, m represents 0 to 95 mol %, and n represents 5 to 100 mol.
1. A polymer for an organic electroluminescent element, comprising a repeating unit represented by the following general formula (1) in a repeating unit constituting a main chain:
where R's each represent a hydrogen atom, a C 1 to C 20 alkyl group, a C 1 to C 20 alkoxy group, a C 6 to C 30 aryl group, a C 6 to C 30 aryloxy group, a C 7 to C 36 arylalkyl group, a C 7 to C 36 arylalkyloxy group, a C 3 to C 30 heteroaryl group, a C 3 to C 30 heteroaryloxy group, or a C 3 to C 30 cycloalkyl group, and may be identical to or different from each other; Y's each represent a single bond, a C 1 to C 20 alkylene group, a C 6 to C 30 arylene group, a C 3 to C 30 heteroarylene group, CO, COO, or O; Z represents one kind or two or more kinds selected from indolocarbazolyl groups represented by the following formulae (2) to (7); W represents a charge transporting group and is different from Z; m and n represent molar ratios, m represents 0 to 95 mol %, and n represents 5 to 100 mol % relative to 100 mol % of all repeating units; and l represents an average number of repetitions and represents 2 to 10,000:
in the formulae (2) to (7), X's each independently represent C—H, N, or C-L; L independently represents a C 6 to C 30 aryl group, a C 3 to C 30 heteroaryl group, or a C 12 to C 60 diarylamino group; and R 1 's each independently represent a C 1 to C 20 alkyl group, a C 1 to C 20 alkoxy group, a C 6 to C 30 aryl group, a C 6 to C 30 aryloxy group, a C 7 to C 36 arylalkyl group, a C 7 to C 36 arylalkyloxy group, a C 3 to C 30 heteroaryl group, a C 3 to C 30 heteroaryloxy group, or a C 3 to C 30 cycloalkyl group.
2. A polymer for an organic, electroluminescent element according to claim 1 , wherein in the general formula (1), m represents 0 mol %.
3. A polymer for an organic electroluminescent element according to claim 1 , wherein in the general formula (1), m represents 5 to 95 mol %, and n represents 5 to 95 mol %.
4. A polymer for an organic electroluminescent element according to claim 1 , wherein the polymer for an organic electroluminescent element has a weight-average molecular weight of 1,000 to 1,000,000.
5. A polymer for an organic electroluminescent element according to claim 1 , wherein in the general formula (1), W represents a charge transporting group represented by the following formula (8) or (9):
in the formula (8) or (9), X 2 's each independently represent C—H, N, O, S, or C-L; and L independently represents a C 6 to C 30 aryl group, a C 3 to C 30 heteroaryl group, or a C 12 to C 60 diarylamino group and may be bonded to a ring including X 2 's to form a condensed ring.
6. A polymer for an organic electroluminescent element according to claim 1 , wherein in the general formula (1), W represents a charge transporting group represented by the following formula (10) or (11):
in the formula (10) or (11), R 2 's each represent a hydrogen atom, a C 1 to C 20 alkyl group, a C 1 to C 20 alkoxy group, a C 6 to C 30 aryl group, a C 6 to C 30 aryloxy group, a C 7 to C 36 arylalkyl group, a C 7 to C 36 arylalkyloxy group, a C 3 to C 30 heteroaryl group, a C 3 to C 30 heteroaryloxy group, or a C 3 to C 30 cycloalkyl group, and may be identical to or different from each other.
7. An organic electroluminescent element, comprising, organic layers between an anode layer and a cathode layer laminated on a substrate, wherein at least one of the organic layers includes the polymer for an organic electroluminescent element according to any one of claims 1 to 4 , 5 , and 6 .
8. An organic electroluminescent element according to claim 7 , wherein the organic layer including the polymer for an organic electroluminescent element comprises a hole transport layer.