# US 8,465,848 B2 · Benzofluorenes for luminescent applications

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- Number: US 8,465,848 B2
- Document ID: US8465848B2
- Status: Granted
- Kind: B2
- Application number: 11/960,889
- Filed: 2007-12-20
- Published: 2008-07-03
- Granted: 2013-06-18
- Earliest claimed: 2006-12-29
- Assignees: E. I. Du Pont de Nemours and Company
- Applicants: Eric Maurice Smith
- Inventors: Eric Maurice Smith
- Web page: https://patentgrep.com/patent/US8465848B2

## CPC

- H10K 85/633: {comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom}
- C07C 211/61: with at least one of the condensed ring systems formed by three or more rings
- C09K 11/06: containing organic luminescent materials
- C07C 2603/40: containing four condensed rings
- C09K 2211/1007: Non-condensed systems
- C09K 2211/1011: Condensed systems
- C09K 2211/1029: containing one nitrogen atom as the heteroatom
- H10K 50/11: characterised by the electroluminescent [EL] layers
- H10K 85/622: {containing four rings, e.g. pyrene}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

This invention relates to electroluminescent benzofluorenes that are useful in electroluminescent applications. It also relates to electronic devices in which the active layer includes such a benzofluorene composition.

## Claims

### Claim 1

A composition compound of Formula I:
wherein each of R1, R2, and R3 is independently selected from the group consisting of hydrogen, halogen, alkyl, fluoroalkyl, aryl, heteroaryl, diarylamino, dialkylamino, aryl(alkyl)amino, arylthio, alkylthio, arylseleno, alkylseleno, aryloxy, alkoxy, dialkylphosphino, diarylphosphino, dialkylphosphoryl, diarylphosphoryl, and thiophosphoryl.

### Claim 2 (depends on 1)

The composition compound of claim 1, wherein R1 is the same or different at each occurrence and is an alkyl group, and R2 and R3 are hydrogen.

### Claim 3 (depends on 1)

The composition compound of claim 1, wherein R1 is the same or different at each occurrence and is an alkyl group, at least one R2 is selected from the group consisting of fluoro, alkyl, and fluoroalkyl, and R3 is hydrogen.

### Claim 4

An organic electronic device comprising: a. a first electrical contact layer;
b. a layer comprising a composition compound of Formula I:
wherein each of R1, R2, and R3 is independently selected from the group consisting of hydrogen, halogen, alkyl, fluoroalkyl, aryl, heteroaryl, diarylamino, dialkylamino, aryl(alkyl)amino, arylthio, alkylthio, arylseleno, alkylseleno, aryloxy, alkoxy, dialkylphosphino, diarylphosphino, dialkylphosphoryl, diarylphosphoryl, and thiophosphoryl; and
c. a second electrical contact layer.

### Claim 5 (depends on 4)

The device of claim 4, wherein R1 is the same or different at each occurrence and is an alkyl group, and R2 and R3 are hydrogen.

### Claim 6 (depends on 4)

The device of claim 4, wherein R1 is the same or different at each occurrence and is an alkyl group, at least one R2 is selected from the group consisting of fluoro, alkyl, and fluoroalkyl, and R3 is hydrogen.

### Claim 7 (depends on 4)

The device of claim 4, wherein the layer comprising a composition compound of Formula I is an active layer.

### Claim 8 (depends on 7)

The device of claim 7, wherein the active layer is a photoactive layer.

### Claim 9 (depends on 8)

The device of claim 8, wherein the compound is a dopant.

### Claim 10 (depends on 8)

The device of claim 8, wherein the compound is a host.

### Claim 11 (depends on 1)

The compound of claim 1 which, when formed into a film by vacuum deposition, is capable of emitting blue light.

### Claim 12 (depends on 4)

The device of claim 4 wherein the layer comprising the compound of Formula I is capable of emitting blue light.