Blue thermally activated delayed fluorescent emitters and hosts based on functionalized imidazolyl groups

Inventors

Li, Jian • Wu, Jiang

Assignees

Arizona State University ASU

Abstract

Compounds of General Formula I may act as thermally activated delayed fluorescent emitters in organic electroluminescent devices. Compounds of General Formula I have donor and acceptor groups part of the same conjugated system. Devices incorporating compounds of General Formula I may have higher EQE and longer material lifetimes.

Core Innovation

The invention relates to compounds defined by General Formula I, in which Y1a, Y1b, Y1c, Y2a, Y2b, Y2c, and Y2d each independently represent C or N, and C and E each represent N. Y1 and Y2 are independently absent or present, valency permitting, and the structure allows the permitted substituent classes for Y1/Y2 and for R1 and R2.

General Formula I further specifies that at least two adjacent R2 groups together represent a group of Formula A, and at least two adjacent R3 groups together represent a group of Formula B. The definitions include allowed element and valency-permitting options for X1 and X2, including C, N, Si, O, S, Ge, P, As, Se, B, Al, Bi and valency-permitting forms such as CR4, SiR4, GeR4, NR4, P−O, As−O, BR4, AlR4, Bi−O, and related substitutions.

The document also describes named general formula embodiments and corresponding structural drawings, including specific structural coverage for compounds represented by one of the following structures. The overall purpose is to define allowable substituent and heteroatom meanings across a constrained conjugated compound scaffold with Formula A and Formula B adjacency requirements, and to describe a device configuration that uses the disclosed compounds.

Claims Coverage

Two independent claims are present: one directed to a compound of General Formula I with Formula A and Formula B adjacency constraints and defined variable substituent meanings, and one directed to a compound represented by one of the following structures. The independent-claim coverage therefore spans a broad General Formula I compound class constrained by adjacent group requirements and specific structural embodiments.

Across the independent claims, the inventive coverage is directed to compounds defined by constrained conjugated scaffolds with adjacency requirements for Formula A and Formula B, and by specific provided structures, with extensive allowed substituent and heteroatom definitions for the variable positions.

Stated Advantages

Documented Applications