Optical film, composition for forming colored layer, dipyrromethene cobalt complex and display device

A composition for forming a colored layer, the composition comprising:

• a dye (A);
• a photopolymerizable compound (B);
• and a photopolymerization initiator (C), the dye (A) containing a colorant, the colorant containing a dipyrromethene cobalt complex having a structure represented by the following formula (I), in which R1 to R7 in the following formulas (I) and (II) are each independently a monovalent group selected from the group consisting of a hydrogen atom, a halogen atom, an aliphatic hydrocarbon group, an alkoxy group, an alkylthio group, an aromatic hydrocarbon group, a heterocyclic group, a hydroxyl group, a mercapto group, a nitro group, a substituted amino group, an unsubstituted amino group, a cyano group, a sulfo group, an ester group and an acyl group, wherein
• the colorant satisfies at least one of the following conditions (1) to (4):
• (1) The colorant has a wavelength of maximum absorption in the range of 470 nm to 530 nm, and, when thermogravimetric measurement is performed for the dipyrromethene cobalt complex under conditions of a gas flow rate of 500 mL/min and a temperature increase rate of 10° C./min, a 5% weight loss temperature when the gas is air and a 5% weight loss temperature when the gas is nitrogen are both 300° C. or higher, and when thermogravimetric measurement is performed under conditions of a nitrogen flow rate of 500 mL/min and a temperature increase rate of 10° C./min, a 50% weight loss temperature is 360° C. or higher and 470° C. or lower;
• (2) The colorant has a wavelength of maximum absorption of 489 nm to 500 nm and a full width at half maximum of an absorption peak of 22 nm or less in acetone solution with a concentration of 5.0×10−6 M, and has a full width at half maximum of an absorption peak of 30 nm or less;
• (3) The colorant has a wavelength of maximum absorption in the range of 470 nm to 530 nm, and contains a dipyrromethene cobalt complex in which R1 to R7 are combined such that a free energy change between before and after the reaction, calculated by applying R1 to R7 in the formula (I) to the following reaction formula (II) using a quantum chemical calculation program Gaussian 16 with a calculation method B3LYP and a basis function 6-31G (d,p) (however, a basis function LanL2DZ is assigned to elements having an atomic number greater than that of Kr in the periodic table), is 0.92 kcal/mol or greater;
• and
• (4) The colorant has a wavelength of maximum absorption in the range of 470 nm to 530 nm, and contains a dipyrromethene cobalt complex in which R1 to R7 are combined such that a free energy change between before and after the reaction, calculated by applying R1 to R7 in the formula (I) to the following reaction formula (II) using a quantum chemical calculation program Gaussian 16 with a calculation method B3LYP and a basis function 6-31G (d,p) (however, a basis function LanL2DZ is assigned to elements having an atomic number greater than that of Kr in the periodic table), is −1.0 kcal/mol or greater, and at least one of R1 to R4 is a hydrogen atom or a halogen atom.

A dipyrromethene cobalt complex having a structure represented by the following formula (I-1), in which R1 to R5 in the following formula (I-1) are each independently a monovalent group selected from the group consisting of a hydrogen atom, a halogen atom, an aliphatic hydrocarbon group, an alkoxy group, an alkylthio group, an aromatic hydrocarbon group, a heterocyclic group, a hydroxyl group, a mercapto group, a nitro group, a substituted amino group, an unsubstituted amino group, a cyano group, a sulfo group, an ester group and an acyl group, wherein

• the dipyrromethene cobalt complex satisfies at least one of the following conditions (1) to (3):
• (1) When thermogravimetric measurement is performed for the dipyrromethene cobalt complex under conditions of a gas flow rate of 500 mL/min and a temperature increase rate of 10° C./min, a 5% weight loss temperature when the gas is air and a 5% weight loss temperature when the gas is nitrogen are both 300° C. or higher, and when thermogravimetric measurement is performed under conditions of a nitrogen flow rate of 500 mL/min and a temperature increase rate of 10° C./min, a 50% weight loss temperature is 360° C. or higher and 470° C. or lower, and R8 and R9 are each independently an alkyl group having 1 to 6 carbon atoms;
• (2) An acetone solution of the dipyrromethene cobalt complex has a molar absorption coefficient of 190,000 L/(mol·cm) or greater, R1 to R5, R8 and R9 are combined such that a free energy change between before and after the reaction, calculated by applying R1 to R5, R8 and R9 in the formula (I-1) to the following reaction formula (II) using a quantum chemical calculation program Gaussian 16 with a calculation method B3LYP and a basis function 6-31G (d,p) (however, a basis function LanL2DZ is assigned to elements having an atomic number greater than that of Kr in the periodic table), is 0.92 kcal/mol or greater, R8 and R9 are each independently an alkyl group having 1 to 6 carbon atoms, R6 is —C(═O)—O—R8, and R7 is —C(═O)—O—R9;
• and
• (3) An acetone solution of the dipyrromethene cobalt complex has a molar absorption coefficient of 190,000 L/(mol·cm) or greater, R8 and R9 are each independently an alkyl group having 1 to 6 carbon atoms, and at least one of R1 to R4 is a hydrogen atom or a halogen atom.