Organic electroluminescent materials and devices

Patent metadata

Field	Value
Publication number	US-2016149139-A1
Application number	US-201414553676-A
Country	US
Kind code	A1
Filing date	Nov 25, 2014
Priority date	Nov 25, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

A composition formed of a mixture of two compounds having similar thermal evaporation properties that are pre-mixed into an evaporation source that can be used to co-evaporate the two compounds into an emission layer in OLEDs via vacuum thermal evaporation process is disclosed. The first and second compounds can have an evaporation temperature T 1 and T 2 , respectively, of 150 to 350° C., and the absolute value of T 1 −T 2 can be less than 20° C. The first compound can have a concentration C 1 in the mixture and a concentration C 2 in a film formed by evaporating the mixture in a vacuum deposition tool at a constant pressure between 1×10 −6 Torr to 1×10 −9 Torr, at a 2 Å/sec deposition rate on a surface positioned at a predefined distance away from the mixture being evaporated, where the absolute value of (C 1 −C 2 )/C 1 is less than 5%.

First claim

1 . A composition comprising, a mixture of a first compound and a second compound;
wherein the first compound has a different chemical structure than the second compound; wherein the mixture of the first compound and the second compound is capable of functioning as a delayed fluorescent system in an organic light emitting device at room temperature; wherein the first compound has an evaporation temperature T 1 of 150 to 350° C.; wherein the second compound has an evaporation temperature T 2 of 150 to 350° C.; wherein absolute value of T 1 −T 2 is less than 20° C.; wherein the first compound has a concentration C 1 in said mixture and a concentration C 2 in a film formed by evaporating the mixture in a vacuum deposition tool at a constant pressure between 1×10 −6 Torr to 1×10 −9 Torr, at a 2 Å/sec deposition rate on a surface positioned at a predefined distance away from the mixture being evaporated; and wherein absolute value of (C 1 −C 2 )/C 1 is less than 5%.

2 - 3 . (canceled)

4 . The composition of claim 1 , wherein the first compound has a vapor pressure of P 1 at T 1 at 1 atm, and the second compound has a vapor pressure of P 2 at T 2 at 1 atm; and
wherein the ratio of P 1 /P 2 is within the range of 0.90:1 to 1.10:1.

5 - 7 . (canceled)

8 . The composition of claim 1 , wherein the second compound is capable of functioning as a host in an organic light emitting device at room temperature.

9 - 10 . (canceled)

11 . The composition of claim 1 , wherein the second compound comprises at least one chemical group selected from the group consisting of anthracence, naphthylene, phenanthrene, triphenylene, carbazole, dibenzothiphene, dibenzofuran, dibenzoselenophene, aza-triphenylene, aza-carbazole, aza-dibenzothiophene, aza-dibenzofuran, and aza-dibenzoselenophen.

12 . (canceled)

13 . The composition of claim 1 , wherein the composition further comprises a third compound, wherein the third compound has a different chemical structure than the first and second compounds, wherein the third compound has an evaporation temperature T 3 of 150 to 350° C., and wherein absolute value of T 1 −T 3 is less than 20° C.

14 . The composition of claim 1 , wherein the composition is in liquid form at a temperature less than the lesser of T 1 and T 2 .

15 . The composition of claim 1 , wherein the delayed fluorescent system is a P-type delayed fluorescent system.

16 . The composition of claim 15 , wherein the first compound comprises at least one chemical group selected from the group consisting of pyrene, fluoranthene, chrysene, benzofluorene, and stilbene.

17 . The composition of claim 15 , wherein the first compound is selected from the group consisting of:

18 . The composition of claim 17 , wherein the second compound is selected from the group consisting of:

Assignees

• Universal Display Corp

Inventors

• Xia Chuanjun
• Lin Chun
• Wang Ting-Chih

Classifications

• C09K2211/1466

  containing nitrogen as the only heteroatom · CPC title

• C09K11/06 Primary

  containing organic luminescent materials · CPC title

• C09K2211/1059

  containing three nitrogen atoms as heteroatoms · CPC title

• C09K2211/1014

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

• C09K2211/1051

  with sulfur · CPC title