Patent ID: 8003976

Claim:
An organic light-light conversion device comprising: a light sensing unit having a layer including a photo-conductive organic semiconductor that causes a photo-current multiplication phenomenon by light irradiation, and a light emitting unit having a layer including an electroluminescent organic semiconductor that emits light by current injection, characterized in that at least one of the photo-conductive organic semiconductor and the electroluminescent organic semiconductor is a polymer semiconductor having a conjugation in the main chain, wherein the polymer semiconductor contains one or more repeating units represented by the following Formula (1): wherein Ar 1 and Ar 2 each independently represent an arylene group or a divalent heterocyclic group; X 1 represents —CR 1 ═CR 2 —, —C≡C— or —N(R 3 )—; R 1 and R 2 each independently represent a hydrogen atom, an alkyl group, an aryl group, a monovalent heterocyclic group, a carboxyl group, a substituted carboxyl group or a cyano group; R 3 represents a hydrogen atom, an alkyl group, an aryl group, a monovalent heterocyclic group, an arylalkyl group or a substituted amino group; m, n and q each independently represent an integer of 0 or 1; p represents an integer of 0 to 2; and m+n and p+q are each 1 or more, provided that Ar 1 , X 1 , R 1 , R 2 and R 3 , if they are each multiple, can be respectively identical or different, and has a polystyrene-converted number average molecular weight of 1×10 3 to 1×10 8 .