Boron-containing polymer compound and organic light emitting device using the same
The present invention provides a polymer material showing high luminous efficiency at a low voltage and suitable for increasing the emission area and for the mass production, and an organic light emitting device using the same. The present invention relates to a polymer compound comprising a boron-containing monomer unit represented by formula (1): [in the formula, A represents a triphenyl boron group in which the phenyl group may be substituted, R 16 represents a hydrogen atom or an alkyl group having 1 to 12 carbon atoms. X represents a single bond, —O—, —S—, —SO—, —SO 2 — or a divalent hydrocarbon group having 1 to 20 carbon atoms which may have a hetero atom], a light-emitting polymer compound comprising the boron-containing monomer unit and a light-emitting monomer unit, a light-emitting composition comprising the boron-containing monomer unit and a light-emitting low-molecular compound or light-emitting polymer compound, and organic light-emitting device using the light-emitting polymer compound or the light-emitting composition.
1. A polymer compound characterized by comprising a monomer unit represented by formula (2):
wherein R 16 represents a hydrogen atom or an alkyl group having 1 to 12 carbon atoms; X represents a single bond, —O—, —S—, —SO—, —SO 2 — or a divalent hydrocarbon group having 1 to 20 carbon atoms which may have a hetero atom; and R 1 to R 15 independently represent a hydrogen atom, a halogen atom, a cyano group, an amino group, a hydrocarbon alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aryloxy group, an aromatic group or a heterocyclic group; and wherein among R 1 to R 15 , those adjacent to each other on one phenyl group may be bonded to form a condensed ring.
2. The polymer compound as claimed in claim 1 , wherein in the monomer unit represented by formula (2), at least four of R 1 ,R 4 , R 5 , R 9 , R 10 and R 13 each represent an alkyl group having 1 to 6 carbon atoms or alkoxy group having 1 to 6 carbon atoms (provided that R 1 and R 4 are at ortho positions with respect to the substitution position of the boron atom).
3. The polymer compound as claimed in claim 1 , comprising a monomer unit represented by formula (3):
wherein, R 2 , R 3 , R 6 to R 8 , R 11 , R 12 , R 15 and R 16 represent the same meanings as defined in formula (2).
4. The polymer compound as claimed in claim 1 , comprising a monomer unit represented by formula (4):
wherein R 1 to R 6 , R 8 to R 13 and R 16 have the same meanings as defined in formula (2) respectively, R 17 R 26 independently represent a hydrogen atom, a halogen atom, a cyano group, an amino group, a hydrocarbon alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aryloxy group, an aromatic group or a heterocyclic group, and wherein among R 17 R 26 , those adjacent to each other on one phenyl group may be bonded with each other to form a condensed ring.
5. The polymer compound as claimed in claim 1 , which is a light-emitting polymer compound comprising the monomer unit represented by formula (2) described in claim 1 and a light-emitting monomer unit.
6. The light-emitting polymer compound as claimed in claim 5 , wherein light emitted by the light-emitting monomer unit is phosphorescence.
7. The light-emitting polymer compound as claimed in claim 6 , wherein the light-emitting monomer contains a transition metal complex.
8. The light-emitting polymer compound as claimed in claim 7 , wherein the light-emitting monomer unit contains a metal selected from metals of atomic numbers 39 to 48 and 72 to 80.
9. The light-emitting polymer compound as claimed in claim 1 , wherein the light-emitting polymer compound contains a hole-transporting monomer unit.
10. A light-emitting composition, comprising a polymer compound containing the monomer unit represented by formula (2) described in claim 1 and a light-emitting compound.
11. The light-emitting composition as claimed in claim 10 , wherein the light-emitting compound is a low molecular weight compound or a polymer compound.
12. An organic light-emitting device comprising one or more polymer layers between an anode and a cathode, wherein at least one of the polymer layers present between the anode and the cathode comprises the light-emitting polymer compound described in claim 5 .
13. An organic light-emitting device comprising one or more polymer layers between an anode and a cathode, wherein at least one of the polymer layers present between the anode and the cathode comprises the light-emitting composition described in claim 10 .
14. A light source for surface emission, a backlight for a display unit, a display unit, an illumination device or an interior or exterior accessory comprising the light emitting device described in claim 12 .