Organic electroluminescent device
View Patent ↗Disclosed is an organic electroluminescent device (organic EL device) utilizing phosphorescence which is improved in luminous efficiency and sufficiently secured of driving stability. The organic EL device comprises an anode 2 , organic layers containing a hole-transporting layer 4 , a light-emitting layer 5 , and an electron-transporting layer 6 , and a cathode 7 piled one upon another on a substrate 1 , the hole-transporting layer is disposed between the light-emitting layer and the anode, the electron-transporting layer is disposed between the light-emitting layer and the cathode, and the light-emitting layer comprises an organic Al complex represented by the following general formula (I) as a host material and an organic Ir complex represented by the following general formula (II) as a guest material. In formula (I), L is ArO—, ArCOO—, Ar 3 SiO—, Ar 3 GeO—, or Ar 2 AlO—.
1. An organic electroluminescent device comprising an anode, organic layers containing a hole-transporting layer, a light-emitting layer, and an electron-transporting layer, and a cathode piled one upon another on a substrate with the hole-transporting layer disposed between the light-emitting layer and the anode and the electron-transporting layer disposed between the light-emitting layer and the cathode wherein the light-emitting layer comprises an organic metal complex represented by the following general formula (I) as a host material and an organic metal complex represented by general formula (II) as a guest material:
in general formula (I), each of R 1 to R 6 is independently a hydrogen atom, an C1-C6 alkyl group, an C1-C6 alkoxy group and L is a monovalent group represented by the following general formula (1) or (4)
wherein each of Ar 1 is a substituted or unsubstituted phenyl group or a substituted or unsubstituted naphthyl group, wherein when Ar 1 is substituted, the substituent is independently a C1-C6 alkyl group, a phenyl group, a naphthyl group, or a phenyl group substituted at the 3- and 5-positions with methyl groups, and R 1 to R 6 are as defined above; in general formula (II),
wherein, each of R 7 to R 14 is independently a hydrogen atom, an C1-C6 alkyl group, an aralkyl group, an C1-C6 alkoxy group, or phenyl group.
2. The organic electroluminescent device as described in claim 1 wherein an electron-injecting layer is disposed between the cathode and the electron-transporting layer.
3. The organic electroluminescent device as described in claim 1 wherein a hole-injecting layer is disposed between the anode and the hole-transporting layer.
4. The organic electroluminescent device as described in claim 3 wherein an electron-injecting layer is disposed between the cathode and the electron-transporting layer.
5. An organic electroluminescent device comprising an anode, organic layers containing a hole-transporting layer, a light-emitting layer, and an electron-transporting layer, and a cathode piled one upon another on a substrate with the hole-transporting layer disposed between the light-emitting layer and the anode and the electron-transporting layer disposed between the light-emitting layer and the cathode wherein the light-emitting layer comprises BmqAl as a host material and Irbt 3 as a guest material.
6. An organic electroluminescent device comprising an anode, organic layers containing a hole-transporting layer, a light-emitting layer, and an electron-transporting layer, and a cathode piled one upon another on a substrate with the hole-transporting layer disposed between the light-emitting layer and the anode and the electron-transporting layer disposed between the light-emitting layer and the cathode wherein the light-emitting layer comprises BAlq as a host material and Irbt 3 as a guest material.