Blue light emitting compound and organic electroluminescent device using the same
A blue light emitting compound and an organic electroluminescent device using the compound are provided. The device exhibits improved color purity of blue emission and excellent life characteristics so as to be used to manufacture a full-color display.
1. A blue light-emitting compound of Formula 1:
wherein A 1 to A 4 are each independently a C 6 -C 20 aryl group which is unsubstituted or substituted with a group selected from the group consisting of C 1 -C 10 alkyl, C 1 -C 10 alkoxy, cyano, C 1 -C 10 alkylamino, C 1 -C 10 alkylsilyl, halogen, C 6 -C 10 aryl, C 6 -C 10 aryloxy, C 6 -C 10 arylamino, C 6 -C 10 arylsilyl and hydrogen, or a C 4 -C 19 heteroaryl group containing at least one heteroatom selected from N, S and O atoms; if n is 0, the substituents of A1 and A2 include at least one cyano group and at least one alkylsilyl or arylsilyl group; and if n is 1, the substituents of A1 to A4 include at least one cyano group and at least one alkylsilyl or arylsilyl group.
2. The blue light-emitting compound according to claim 1 , wherein the blue light-emitting compound is selected from the group consisting of the following compounds (2):
3. An organic electroluminescent device comprising an anode, an organic light-emitting layer and a cathode wherein the organic light-emitting layer includes the blue light-emitting compound according to claim 1 .
4. The device according to claim 3 , wherein the organic light-emitting layer further includes a compound selected from the following compounds (3):
5. The device according to claim 3 , further comprising a hole transport layer disposed between the anode and the organic light-emitting layer, and an electron transport layer disposed between the cathode and the organic light-emitting layer wherein the electron transport layer is formed of a compound selected from the following compounds (4):
6. The device according to claim 5 , further comprising a hole injecting layer disposed under the hole transport layer.
7. The device according to claim 5 , further comprising an electron injecting layer disposed on the electron transport layer.
8. The device according to claim 5 , wherein the hole transport layer is formed of N,N′-bis(3-methylphenyl)-N,N′-diphenyl-[1,1′-biphenyl]-4,4′-diamine (TPD) or N,N′-di(naphthalen-1-yl)-N,N′-diphenylbenzidine (α-NPD).
9. The device according to claim 6 , wherein the hole injecting layer is formed of copper phthalocyanine (CuPc), 4,4′,4″-tri(N-carbazolyl)triphenylamine (TCTA), 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA) or DAPEB.