US 9,812,661 B2
Organic electroluminescent device
Hitoshi Kuma, Sodegaura (JP); Yuichiro Kawamura, Sodegaura (JP); Yukitoshi Jinde, Sodegaura (JP); Toshinari Ogiwara, Sodegaura (JP); and Chishio Hosokawa, Sodegaura (JP)
Assigned to IDEMITSU KOSAN CO., LTD., Chiyoda-ku (JP)
Filed by Idemitsu Kosan Co., Ltd., Chiyoda-ku (JP)
Filed on Jun. 4, 2013, as Appl. No. 13/909,138.
Application 13/909,138 is a continuation of application No. 12/788,788, filed on May 27, 2010, granted, now 8,476,823.
Application 12/788,788 is a continuation in part of application No. 12/477,599, filed on Jun. 3, 2009, abandoned.
Claims priority of application No. 2009-124759 (JP), filed on May 22, 2009.
Prior Publication US 2013/0270539 A1, Oct. 17, 2013
Int. Cl. H01L 51/54 (2006.01); C09K 11/06 (2006.01); H01L 51/50 (2006.01); B82Y 10/00 (2011.01); C09B 57/00 (2006.01); C09B 1/00 (2006.01); H01L 51/00 (2006.01)
CPC H01L 51/5028 (2013.01) [B82Y 10/00 (2013.01); C09B 1/00 (2013.01); C09B 57/00 (2013.01); C09B 57/001 (2013.01); H01L 51/5016 (2013.01); H01L 51/5096 (2013.01); H01L 51/0048 (2013.01); H01L 51/0059 (2013.01); H01L 51/0072 (2013.01); H01L 51/0073 (2013.01); H01L 51/5036 (2013.01)] 23 Claims
OG exemplary drawing
 
1. An organic electroluminescence device comprising at least an anode, an emitting layer, an electron-transporting region and a cathode in sequential order, wherein
the emitting layer contains a host represented by the following formula (10) and a dopant which gives fluorescent emission of which the main peak wavelength is 550 nm or less;
the affinity Ad of the dopant is equal to or larger than the affinity Ah of the host;
the triplet energy ETd of the dopant is larger than the triplet energy ETh of the host; and
a blocking layer is provided within the electron-transporting region such that it is adjacent to the emitting layer,
the blocking layer comprises a polycyclic aromatic compound having a skeleton part selected from the group consisting of compounds shown by the following formulas (1), (3), and (4) optionally comprising a substituent selected from the group consisting of a halogen atom, a hydroxyl group, a substituted or unsubstituted amino group, a nitro group, a cyano group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aromatic hydrocarbon group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkoxycarbonyl group or a carboxyl group; and a polycyclic aromatic compound represented by the following formula (10A); and
the triplet energy ETb of the polycyclic aromatic compound is larger than ETh:

OG Complex Work Unit Drawing
wherein in formula (10), Ar11 and Ar12 are independently a substituted or unsubstituted aryl group having 6 to 50 carbon atoms that form a ring or a substituted or unsubstituted hetrocyclic group having 5 to 50 ring atoms, and
R1 to R8 are independently a group selected from a hydrogen atom, a substituted or unsubstituted aryl group having 6 to 50 ring carbon atoms, a substituted or unsubstituted hetrocyclic group having 5 to 50 ring atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 50 ring carbon atoms, a substituted or unsubstituted alkoxy group having 1 to 50 carbon atoms, a substituted or unsubstituted aralkyl group having 7 to 50 carbon atoms, a substituted or unsubstituted aryloxy group having 6 to 50 ring carbon atoms, a substituted or unsubstituted arylthio group having 6 to 50 ring carbon atoms, a substituted or unsubstituted alkoxycarbonyl group having 2 to 50 carbon atoms, a substituted or unsubstituted silyl group, a carboxyl group, a halogen atom, a cyano group, a nitro group and a hydroxyl group

OG Complex Work Unit Drawing
wherein in formulas (1), (3), and (4), Ar1, and Ar3 to Ar5 are a substituted or unsubstituted condensed ring structure having 4 to 16 ring carbon atom,

OG Complex Work Unit Drawing
wherein in formula (10A), X13 to X18, X20 and X21 are independently a hydrogen atom, a halogen atom, a linear, branched or cyclic alkyl group, a linear, branched or cyclic alkoxy group, a substituted or unsubstituted aryl group, and X12 and X19 are independently a hydrogen atom, a halogen atom, a linear, branched, or cyclic alkyl group, a liner, branched or cyclic alkoxy group.