US009741942B2 (12 ) United States Patent (10 ) Patent No. : US 9 , 741, 942 B2 Stoessel et al. (45 ) Date of Patent: Aug . 22 , 2017 ( 54 ) MATERIALS FOR ORGANIC 11/ 02 ( 2013 .01 ) ; C09K 11/ 06 ( 2013 .01 ) ; HOIL ELECTROLUMINESCENT DEVICES 51/ 006 ( 2013 .01 ) ; HOIL 51/ 0052 ( 2013 .01 ) ; HOIL 51/ 0054 ( 2013 .01 ) ; HOIL 51 /0056 (71 ) Applicant : Merck Patent GmbH , Darmstadt (DE ) ( 2013 .01 ) ; HOIL 51 /0061 ( 2013 .01 ) ; HOIL ( 72 ) Inventors : Philipp Stoessel , Frankfurt am Main 51/ 0067 ( 2013 .01 ) ; HOIL 51/ 0071 ( 2013 .01 ) ; (DE ) ; Amir Hossain Parham , HOIL 51/ 0073 ( 2013 .01 ) ; HOIL 51 /0074 Frankfurt am Main (DE ) ; Christof ( 2013 .01 ) ; C09K 2211/ 1011 ( 2013 .01 ) ; COOK Pflumm , Darmstadt- Arheilgen (DE ) ; 2211/ 1029 ( 2013 . 01 ) ; CO9K 2211 / 1033 Anja Jatsch , Frankfurt am Main (DE ) ; ( 2013 .01 ) ; CO9K 2211/ 1037 ( 2013. 01 ) ; COOK Thomas Eberle , Landau (DE ) ; Jonas 2211 / 1059 ( 2013 . 01 ) ; C09K 2211 / 1088 Valentin Kroeber , Frankfurt am Main ( 2013 .01 ) ; COOK 2211 / 1092 ( 2013 . 01 ) ; HOIL 51 /0058 ( 2013 .01 ) ; HOIL 51 / 5008 ( 2013 . 01 ) ; (DE ) HOIL 51 /5012 (2013 . 01 ) ; HOIL 51/ 5056 ( 73 ) Assignee : Merck Patent GmbH , Darmstadt (DE ) ( 2013 . 01 ) ; HO1L 51 / 5072 ( 2013 .01 ) ; HOIL 51 /5092 (2013 .01 ) ; HOIL 51/ 5096 ( 2013 .01 ) ; ( * ) Notice : Subject to any disclaimer, the term of this HOIL 51 / 5221 ( 2013 .01 ) ; HOLL 2251/ 301 patent is extended or adjusted under 35 (2013 .01 ) ; HOIL 2251 /308 ( 2013 .01 ) U . S . C . 154 ( b ) by 305 days . (58 ) Field of Classification Search None (21 ) Appl. No. : 14 /434 , 460 See application file for complete search history . ( 22 ) PCT Filed : Sep . 13 , 2013 ( 56 ) References Cited ( 86 ) PCT No .: PCT/ EP2013 / 002748 U . S . PATENT DOCUMENTS 8 371 ( c ) ( 1 ) , 6 , 187, 786 B1 * 2/ 2001 Venet . .. CO7D 471/ 06 ( 2 ) Date : Apr. 9, 2015 514 /224 . 5 8 ,501 , 948 B2 8 /2013 Konemann (87 ) PCT Pub . No .: WO2014 / 056567 FOREIGN PATENT DOCUMENTS PCT Pub . Date : Apr. 17, 2014 102005037115 A1 2 / 2007 ((65 65 ) Prior Publication Data EP 0014567 AL 8 / 1980 US 2015 / 0270495 A1 Sep . 24 , 2015 0074777 Al 3 /1983 (30 ) Foreign Application Priority Data OTHER PUBLICATIONS Zhang et al. “ Free radical reactions for heterocycle synthesis. Part Oct. 11, 2012 (EP ) 12007040 6 : 2 -Bromobenzoic acids as building blocks in the construction of nitrogen heterocycles ” Tetrahedron , 2003 , 59 , 3009 - 3018 . * (51 ) Int. Ci. Hamana et al . “ Studies on Tertiary Amine Oxides . XLVII . Reaction C070 455 / 03 ( 2006 .01 ) of Quinoline 1 -Oxide Derivatives with Cyanogen Bromide " Chem . HOIL 51/ 00 ( 2006 . 01 ) Pharm . Bill . 1974 , 22 ( 7 ) , 1506 - 1518 . * C09K 11 /06 ( 2006 .01 ) International Search Report for PCT/ EP2013 / 002748 mailed Mar . C070 471/ 16 ( 2006 . 01 ) 11 , 2014 . CO7D 471 / 22 ( 2006 .01 ) C07D 491 / 048 ( 2006 .01 ) * cited by examiner C07D 495 / 22 (2006 .01 ) CO7D 498 / 14 ( 2006 .01 ) Primary Examiner — Robert S Loewe CO7D 513 / 14 ( 2006 .01 ) ( 74 ) Attorney , Agent, or Firm — Drinker Biddle & Reath CO9K 11 /02 ( 2006 .01 ) LLP HOIL 51 / 50 ( 2006 .01 ) HOIL 51 / 52 ( 2006 . 01 ) (57 ) ABSTRACT (52 ) U .S . CI. The present invention relates to compounds according to CPC .. HOIL 51/ 0072 ( 2013 .01 ) ; C07D 455 / 03 formula ( 1 ) , a method for producing these compounds and ( 2013 .01 ) ; C070 471/ 16 ( 2013 .01 ) ; C07D electronic devices, in particular organic electroluminescent 471 /22 ( 2013 . 01 ) ; C07D 491/ 048 ( 2013 .01 ) ; devices containing said compounds. C07D 495 /22 ( 2013. 01 ) ; C07D 498 / 14 ( 2013 .01 ) ; C07D 513 / 14 ( 2013 .01 ) ; C09K 16 Claims, No Drawings US 9 , 741 ,942 B2 MATERIALS FOR ORGANIC The present invention relates to a compound of the ELECTROLUMINESCENT DEVICES formula ( 1 ) , CROSS -REFERENCE TO RELATED APPLICATIONS 5 formula ( 1 ) This application is a national stage application ( under 35 U . S . C . $ 371) of PCT/ EP2013 / 002748 , filed Sep . 13 , 2013 , which claims benefit of European Application No. 12007040 . 4 , filed Oct . 11 , 2012, both of which are incor - 10 porated herein by reference in their entirety . The present invention relates to materials for use in electronic devices , in particular in organic electrolumines cent devices, and to electronic devices, in particular organic 15 electroluminescent devices comprising these materials . where the following applies to the symbols and indices used : The structure of organic electroluminescent devices X is on each occurrence , identically or differently , CR or N ; (OLEDs ) in which organic semiconductors are employed as or precisely two adjacent groups X together stand for a functional materials is described , for example, in U . S . Pat . group selected from NR , O or S , resulting in the formation No . 4 , 539, 507 , U . S . Pat . No . 5 ,151 ,629 , EP 0676461 and 20 of a five- membered ring; WO 98 / 27136 . The emitting materials employed here are Yis on each occurrence , identically or differently , Z = Z , O , increasingly organometallic complexes which exhibit phos S or NR , where R is not equal to H ; phorescence instead of fluorescence . For quantum -mechani - Z is on each occurrence , identically or differently , CR or N cal reasons, an up to four- fold quantum and power efficiency or the adjacent groups Z = Z together stand for a group of is possible using organometallic compounds as phosphores - 25 the formula ( 2 ) , cence emitters . In general, there is still a need for improve ment , for example with respect to efficiency , operating voltage and lifetime, in the case of OLEDs, in particular also formula ( 2 ) in the case of OLEDs which exhibit triplet emission ( phos phorescence ) . This also applies , in particular , to OLEDs 30 which emit in the relatively short -wave region , for example green . The properties of phosphorescent OLEDs are not deter mined only by the triplet emitters employed . In particular, where X has the meanings given above and the dashed the other materials used , such as matrix materials , hole - 35 bonds indicate the linking of this group ; blocking materials , electron - transport materials , etc ., are L is not present for n = 1 and is a single bond or a divalent also of particular importance here . Improvements in these group for n = 2 and a trivalent group for n = 3 and a materials may thus also result in significant improvements in tetravalent group for n = 4 and a pentavalent group for n = 5 the OLED properties. There is also still a need for improve and a hexavalent group for n = 6 ; L here is bonded at any ment in the case of these materials for fluorescent OLEDs. 40 desired point of the basic structure instead of a group R ; In accordance with the prior art , use is made , inter alia , of Ris selected on each occurrence , identically or differently , lactams, for example in accordance with WO 2011/ 116865 from the group consisting of H , D , F , C1, Br, I , CN , NO , , or WO 2011/ 137951 , asmatrix materials for phosphorescent N (Art ) 2 , N ( R ) 2 , CEO ) Ar ' , C ( O ) R ' , P ( = O ) (Art ) 2 , a emitters in organic electroluminescent devices. In general, straight- chain alkyl, alkoxy or thioalkyl group having 1 to further improvements are desirable here, in particular with 45 40 C atoms or a branched or cyclic alkyl, alkoxy or respect to the efficiency, the lifetime and the thermal stability thioalkyl group having 3 to 40 C atoms or an alkenyl or of the materials . alkynyl group having 2 to 40 C atoms, each of which may The object of the present invention is the provision of be substituted by one or more radicals R ' , where one or compounds which are suitable for use in a fluorescent or more non - adjacent CH , groups may be replaced by phosphorescent OLED , in particular a phosphorescent 50 RC = CR ' , C = C , Si( R ) 2 , CEO , C = S , C = NR ' , OLED , for example as matrix material or as electron P ( = O ) ( R ) , SO , SO2, NR ' , O , S or CONR ! and where transport or hole -blocking material . In particular, the object one or more H atoms may be replaced by D , F , C1, Br, I, of the present invention is to provide matrix materials which CN or NO , , an aromatic or heteroaromatic ring system are suitable for green - and red - and optionally also blue having 5 to 60 aromatic ring atoms, which may in each phosphorescent OLEDs. case be substituted by one or more radicals R ? , an aryloxy Surprisingly , it has been found that the compounds or heteroaryloxy group having 5 to 60 aromatic ring described in greater detail below achieve this object and atoms, which may be substituted by one or more radicals result in improvements in the organic electroluminescent R ? , an aralkyl or heteroaralkyl group having 5 to 60 device , in particular with respect to the lifetime, the effi aromatic ring atoms, which may be substituted by one or ciency and /or the operating voltage . This applies , in particu - 60 more radicals R ' , or a combination of these systems, lar , to red - and green - phosphorescent electroluminescent where two or more adjacent substituents R may optionally devices , especially on use of the compounds according to the form a monocyclic or polycyclic , aliphatic , aromatic or invention as matrix material. The materials are furthermore heteroaromatic ring system , which may be substituted by distinguished by high temperature stability . The present one or more radicals R ' ; invention therefore relates to electronic devices , in particular 65 Art is on each occurrence, identically or differently , an organic electroluminescent devices , which