Organic electroluminescence device

Abstract

An organic electroluminescence device includes an anode, a cathode, and an organic thin-film layer interposed between the anode and the cathode. The organic thin-film layer includes a phosphorescent-emitting layer containing a host and a phosphorescent dopant, and an electron transporting layer that is provided closer to the cathode than the phosphorescent-emitting layer. The host contains a substituted or unsubstituted polycyclic fused aromatic skeleton.

1 - 11 . (canceled) 
     
     
         12 . An organic electroluminescence device comprising:
 an anode;   a cathode; and   an organic thin-film layer interposed between the anode and the cathode, wherein   the organic thin-film layer comprises: a phosphorescent-emitting layer comprising a host and a phosphorescent dopant; and an electron transporting layer interposed between the phosphorescent-emitting layer and the cathode,   the host comprises a host compound having a substituted or unsubstituted polycyclic fused aromatic skeleton, and   the electron transporting layer comprises a phosphine oxide compound represented by a formula (6) below,   
       
         
           
           
               
               
           
         
          where: R 6  and R 7  are optionally the same as or different from each other and are respectively selected from hydrogen, an alkyl group, cycloalkyl group, heterocyclic group, alkenyl group, cycloalkenyl group, alkynyl group, alkoxy group, alkylthio group, arylether group, arylthioether group, aryl group, heteroaryl group, cyano group, carbonyl group, ester group, carbamoyl group, amino group, silyl group and a fused ring formed between adjacent substituents; and 
         Ar 4  represents an aryl group or heteroaryl group. 
       
     
     
         13 . The organic electroluminescence device according to  claim 12 , wherein R 6  and R 7  are an aryl group or heteroaryl group. 
     
     
         14 . The organic electroluminescence device according to  claim 12 , wherein
 at least one of R 6 , R 7  and Ar 4  comprises a fused polycyclic aryl group or fused polycyclic heteroaryl group.   
     
     
         15 . The organic electroluminescence device according to  claim 12 , wherein
 R 6  and R 7  are an aryl group or heteroaryl group, and   Ar 4  is a fused polycyclic aryl group or fused polycyclic heteroaryl group.   
     
     
         16 . The organic electroluminescence device according to  claim 12 , wherein
 R 6  or R 7  is a fused polycyclic aryl group or fused polycyclic heteroaryl group directly bonded to a phosphorus atom.   
     
     
         17 . The organic electroluminescence device according to  claim 12 , wherein
 R 6  or R 7  is a fused polycyclic aryl group or fused polycyclic heteroaryl group bonded to a phosphorus atom through another substituent.   
     
     
         18 . The organic electroluminescence device according to  claim 12 , wherein
 R 6  is a fused polycyclic aryl group directly bonded to a phosphorus atom, and   R 7  and Ar 4  are an aryl group.   
     
     
         19 . The organic electroluminescence device according to  claim 12 , wherein
 R 6  is a fused polycyclic aryl group bonded to a phosphorus atom through another substituent, and   R 7  and Ar 4  are an aryl group.   
     
     
         20 . The organic electroluminescence device according to  claim 12 , wherein
 R 6  is a fused polycyclic heteroaryl group directly bonded to a phosphorus atom, and   R 7  and Ar 4  are an aryl group.   
     
     
         21 . The organic electroluminescence device according to  claim 12 , wherein
 R 6  is a fused polycyclic heteroaryl group bonded to a phosphorus atom through another substituent, and   R 7  and Ar 4  are an aryl group.   
     
     
         22 . The organic electroluminescence device according to  claim 21 , wherein
 R 6  is a fused polycyclic heteroaryl group bonded to a phosphorus atom through a phenylene group.   
     
     
         23 . The organic electroluminescence device according to  claim 12 , wherein
 the aryl group is a phenyl group, biphenyl group or terphenyl group.   
     
     
         24 . The organic electroluminescence device according to  claim 12 , wherein
 the phosphine oxide compound comprises one double bond between a phosphorus atom and an oxygen atom.   
     
     
         25 . The organic electroluminescence device according to  claim 12 , wherein
 the polycyclic fused aromatic skeleton is selected from the group consisting of phenanthrene, chrysene, fluoranthene and triphenylene.   
     
     
         26 . The organic electroluminescence device according to  claim 12 , wherein
 the polycyclic fused aromatic skeleton is selected from the group consisting of substituted or unsubstituted phenanthrene-diyl, chrysene-diyl, fluoranthene-diyl and triphenylene-diyl.   
     
     
         27 . The organic electroluminescence device according to  claim 26 , wherein
 the polycyclic fused aromatic skeleton is substituted by a group having phenanthrene, chrysene, fluoranthene and triphenylene.   
     
     
         28 . The organic electroluminescence device according to  claim 12 , wherein
 the polycyclic fused aromatic skeleton is represented by any one of the following formulae (12) to (15),   
       
         
           
           
               
               
           
         
          where: Ar 18  to Ar 22  represent a substituted or unsubstituted fused ring structure having 4 to 10 ring carbon atoms without including carbon atoms of a substituent. 
       
     
     
         29 . The organic electroluminescence device according to  claim 12 , wherein
 the electron transporting layer comprises an electron transporting material having an electron mobility of 10 −5  cm 2 /Vs or more.   
     
     
         30 . The organic electroluminescence device according to  claim 12 , wherein
 the minimum triplet energy gap of the host compounds is in a range of 2.1 eV to 2.7 eV.   
     
     
         31 . The organic electroluminescence device according to  claim 12 , wherein
 a wavelength of the phosphorescent dopant at the maximum luminance intensity is in a range of 470 nm to 700 nm.