Band edge emission enhanced organic light emitting diode utilizing chiral liquid crystalline emitter

A device comprising a light emitting photonic crystal comprising multiple layers of polymerized chiral nematic liquid crystal material, wherein

• the multiple layers of polymerized chiral nematic liquid crystal material comprise a light emitting layer comprising a polymerized chiral nematic liquid crystal material and an electroluminescent material, wherein
• the multiple layers of polymerized chiral nematic liquid crystal material comprise at least one charge transporting layer comprising a polymerized chiral nematic liquid crystal material, wherein
• at least two adjoining layers of the multiple layers of polymerized chiral nematic liquid crystal material have helical structures, wherein
• the at least two adjoining layers of the polymerized chiral nematic liquid crystal material have helical pitches that match in value to within an error of 10%, wherein
• each of the at least two adjoining layers is formed from a polymerized mixture of component materials, said mixtures forming each adjoining layer comprising one or more monomeric component materials capable of displaying a liquid crystalline phase, each said mixture having a desired helical pitch, wherein
• at least one of the multiple layers of polymerized chiral nematic liquid crystal material is formed from a chiral nematic liquid crystalline material mixture comprising a monomeric component material having molecules comprising a chain of aromatic ring structures linked together in a linear fashion, wherein
• the series of aromatic ring structures linked together in a linear fashion is given by the formula:
• wherein Ar represents aromatic diradicals that may be independently chosen, and n is an integer between 1 and 3 and * denotes a point of connection to the remainder of the molecule.

A device comprising a light emitting photonic crystal comprising multiple layers of polymerized chiral nematic liquid crystal material, wherein

• the multiple layers of polymerized chiral nematic liquid crystal material comprise a light emitting layer comprising a polymerized chiral nematic liquid crystal material and an electroluminescent material, wherein
• the multiple layers of polymerized chiral nematic liquid crystal material comprise at least one charge transporting layer comprising a polymerized chiral nematic liquid crystal material, wherein
• at least two adjoining layers of the multiple layers of polymerized chiral nematic liquid crystal material have helical structures, wherein
• the at least two adjoining layers of the polymerized chiral nematic liquid crystal material have helical pitches that match in value to within an error of 10%, wherein
• each of the at least two adjoining layers is formed from a polymerized mixture of component materials, said mixtures forming each adjoining layer comprising one or more monomeric component materials capable of displaying a liquid crystalline phase, each said mixture having a desired helical pitch, wherein
• at least one of the multiple layers of polymerized chiral nematic liquid crystal material is formed from a chiral nematic liquid crystalline material mixture comprising a monomeric component material having molecules comprising a chain of aromatic ring structures linked together in a linear fashion, wherein
• the chain of aromatic ring structures linked together in a linear fashion is terminated at each end with a flexible spacer that is, in turn, terminated with a crosslinking group, wherein
• one or both of the flexible spacers comprise a center of asymmetry, and wherein
• each of the flexible spacers comprising a center of asymmetry may be represented by the formula:
• wherein m is an integer between 1 and 10, p is an integer between 1and 10, * denote points of connection to the rest of the molecule and R is an alkyl group.