Metal complexes, methods, and uses thereof

Patent metadata

Field	Value
Publication number	US-10995108-B2
Application number	US-201815905385-A
Country	US
Kind code	B2
Filing date	Feb 26, 2018
Priority date	Oct 26, 2012
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

Metal complexes that exhibit multiple radiative decay mechanisms, together with methods for the preparation and use thereof.

First claim

What is claimed is:

1. A metal complex comprising:
palladium(II); and
a tetradentate ligand bonded to the transition metal,
wherein:
the metal complex has a lowest triplet excited state and a lowest singlet excited state,
the lowest triplet excited state has a lower energy level than the lowest singlet excited state,
the lowest triplet excited state is associated with phosphorescence, and
a transition from the lowest triplet excited state to the lowest singlet excited state yields delayed fluorescence from the lowest singlet excited state;

wherein the metal complex is represented by one of the following formulas:

wherein M is palladium(II),
wherein A is

 which can optionally be substituted,
wherein D is

 which can optionally be substituted,
wherein C in structure (a) or (b) is

 which can optionally be substituted,
wherein N in structure (a) or (b) is one of the following structures, which can optionally be substituted,

wherein a 2 is absent,
wherein b 1 is present or absent, and if present, comprises a linking group comprising one or more of the following

wherein b 2 is absent;
wherein X is N and
wherein each R independently is hydrogen, aryl, cycloalkyl, cycloalkenyl, heterocyclyl, heteroaryl, alkyl, alkenyl, alkynyl, deuterium, halogen, hydroxyl, thiol, nitro, cyano, amino, a mono- or di-alkylamino, a mono- or diaryl amino, alkoxy, aryloxy, haloalkyl, aralkyl, ester, nitrile, isonitrile, alkoxycarbonyl, acylamino, alkoxycarbonylamino, aryloxycarbonylamino, sulfonylamino, sulfamoyl, carbamoyl, alkylthio, sulfinyl, ureido, phosphoramide, mercapto, sulfo, carboxyl, hydrazino, substituted silyl, or polymerizable, or any conjugate or combination thereof.

2. The metal complex of claim 1 , wherein the metal complex comprises a first portion of the tetradentate ligand corresponding to the lowest singlet excited state and a second portion of the tetradentate ligand corresponding to the lowest triplet excited state, wherein the first and second portions of the tetradentate ligand include a common portion of the tetradentate ligand.

3. The metal complex of claim 1 , wherein an emission spectrum associated with the phosphorescence from the lowest triplet excited state and an emission spectrum associated with the delayed fluorescence from the lowest singlet excited state overlap between 400 nm and 700 nm.

4. The metal complex of claim 1 , wherein the tetradentate ligand comprises at least four five- or six-membered aryl or heteroaryl groups.

5. The metal complex of claim 1 , wherein X is N.

6. The metal complex of claim 1 , wherein N in structure (a) or (b) is

or R substituted

7. The metal complex of claim 1 , represented by any one of

8. A device comprising the metal complex of claim 1 .

9. The device of claim 8 , wherein the device is an organic light emitting diode or a full color display.

Assignees

• Li Jian
• Turner Eric
• Univ Arizona State

Inventors

• Li Jian
• Turner Eric

Classifications

• H10K2101/10

  Triplet emission · CPC title

• C09K2211/188

  of other metals not provided for in one of the previous groups · CPC title

• C09K2211/1033

  with oxygen · CPC title

• C09K2211/1044

  containing two nitrogen atoms as heteroatoms · CPC title

• C07F1/08

  Copper compounds · CPC title