Polymer and organic light-emitting device

Patent metadata

Field	Value
Publication number	US-10985322-B2
Application number	US-201113879503-A
Country	US
Kind code	B2
Filing date	Oct 13, 2011
Priority date	Oct 15, 2010
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

Light-emitting composition and devices including the same, the composition including a fluorescent light-emitting material and a polymer having a conjugating repeat unit and a non-conjugating repeat unit in a backbone of the polymer, and in which the conjugating repeat unit provides at least one conjugation path between repeat units linked to it; the non-conjugating repeat unit reduces conjugation of the polymer as compared to a polymer in which the non-conjugating repeat unit is absent; and a triplet excited state energy level of the light-emitting material is higher than a triplet excited state energy level of the non-conjugating repeat unit.

First claim

The invention claimed is:

1. A light-emitting polymer comprising at least one conjugating repeat unit, a repeat unit of formula (II), and a fluorescent light-emitting repeat unit in a backbone of the polymer, wherein:
the conjugating repeat unit comprises a repeat unit of formula (IV):

wherein R 1 and R 2 are independently H or a substituent or wherein R 1 and R 2 may be linked to form a ring, wherein the conjugating repeat unit is provided in an amount in the range of 50-95 mol % of the total number of repeat units in the polymer;
the repeat unit of formula (II) is linked to adjacent repeat units such that there is no conjugating path of alternating saturated and unsaturated bonds between the adjacent repeat units:

wherein CB is a 1,3-linked phenylene unit; Sp is a spacer group, TQ is a triplet quenching group which non-radiatively quenches triplet excitons; and m is 0 or 1;
a triplet excited state energy level of the fluorescent light-emitting repeat unit is higher than a triplet excited state energy level of the repeat unit of formula (II);
the fluorescent light-emitting repeat unit has the structure of formula (V):

wherein Ar 1 and Ar 2 in each occurrence are independently optionally substituted aryl or heteroaryl; n is greater than or equal to 1; p is 1, 2, or 3; q is 1, 2, or 3; R is (Ar 3 )r, wherein each Ar 3 independently represents an aryl or heteroaryl group which is unsubstituted or substituted with one or more C 1-20 alkyl groups, and r is at least 1; and any aryl or heteroaryl groups of the repeat unit of formula (V) may be linked to one another by a direct bond or a divalent group;
wherein the only arylamine repeat unit that the polymer comprises is the repeat unit of formula (V); and wherein the polymer is a random copolymer; and
wherein the conjugating repeat units are conjugated to, and provide at least one conjugation path between, repeat units linked thereto.

2. A light-emitting polymer according to claim 1 , wherein the repeat unit of formula (II) is twisted out of the plane of at least one adjacent repeat unit.

3. A light-emitting polymer according to claim 1 , wherein the repeat unit of formula (II) does not comprise perylene.

4. A light-emitting polymer according to claim 1 , wherein the repeat units of formula (II) comprise at least 5 mol % of the total number of repeat units in the polymer.

5. A light-emitting polymer according to claim 1 , wherein the polymer comprises at least two different conjugating repeat units.

6. An organic light-emitting device comprising an anode, a cathode and a light-emitting layer between the anode and the cathode wherein the light-emitting layer comprises a light-emitting polymer according to claim 1 .

7. A light-emitting polymer according to claim 1 , wherein the polymer consists of the at least one conjugating repeat unit, the repeat unit of formula (II), and the fluorescent light-emitting repeat unit.

8. The light-emitting polymer of claim 1 , wherein the polymer emits blue fluorescent light.

9. A method of forming a light-emitting polymer according to claim 1 , comprising the steps of polymerising a polymerisation mixture comprising a monomer comprising a conjugating unit and a monomer comprising a unit of formula (II).

10. A method according to claim 9 wherein the polymerisation mixture comprises a monomer comprising a light-emitting unit.

11. A method according to claim 9 wherein the polymerisation is a metal insertion polymerisation wherein each monomer comprises at least two leaving groups capable of participating in the metal insertion polymerisation.

12. A method according to claim 11 wherein each leaving group is independently selected from halogen; a boronic acid or an ester thereof; and a sulfonic acid or a derivative thereof.

Assignees

• Conway Natasha M J
• Pillow Jonathan
• Pounds Thomas
• Jakobsson Fredrik
• Nielsen Christian
• Cambridge Display Tech Ltd
• Sumitomo Chemical Co

Inventors

• Conway Natasha M J
• Pillow Jonathan
• Pounds Thomas
• Jakobsson Fredrik
• Nielsen Christian

Classifications

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• C09K2211/1425

  Non-condensed systems · CPC title

• C09K2211/1433

  bridged by heteroatoms, e.g. N, P, Si or B · CPC title

• C09K2211/1416

  Condensed systems · CPC title

• H10K85/111

  comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene · CPC title