The novel blue light emitting material, 9,10-bis(3',5'-diphenylphenyl)anthracene (BDA) was synthesized by Suzuki coupling reaction and characterized by the measurements of 1H NMR, 13C NMR and FT-IR. The new anthracene derivative, which contains anthracene as a main core unit and 3',5'-diphenylphenyl...
The novel blue light emitting material, 9,10-bis(3',5'-diphenylphenyl)anthracene (BDA) was synthesized by Suzuki coupling reaction and characterized by the measurements of 1H NMR, 13C NMR and FT-IR. The new anthracene derivative, which contains anthracene as a main core unit and 3',5'-diphenylphenyl group derivative as wings, has high fluorescence yield, good thermal stability, and high glass transition temperature at 188 oC. With the newly non-doped blue emitting material in the multilayer device structure, it was possible to achieve the current efficiency of 3.0 cd/A. The EL spectrum of the ITO/CuPc/α-NPD/BDA/Alq3/LiF/Al device showed a maximum wavelength (λmax) at 440 nm. The emitting color of device showed the blue emission (x,y) = (0.18,0.19) at 10 mA/cm2 in CIE (Commission Internationale de l'Eclairage) chromaticity coordinates.
The novel blue light emitting material, 9,10-bis(3',5'-diphenylphenyl)anthracene (BDA) was synthesized by Suzuki coupling reaction and characterized by the measurements of 1H NMR, 13C NMR and FT-IR. The new anthracene derivative, which contains anthracene as a main core unit and 3',5'-diphenylphenyl group derivative as wings, has high fluorescence yield, good thermal stability, and high glass transition temperature at 188 oC. With the newly non-doped blue emitting material in the multilayer device structure, it was possible to achieve the current efficiency of 3.0 cd/A. The EL spectrum of the ITO/CuPc/α-NPD/BDA/Alq3/LiF/Al device showed a maximum wavelength (λmax) at 440 nm. The emitting color of device showed the blue emission (x,y) = (0.18,0.19) at 10 mA/cm2 in CIE (Commission Internationale de l'Eclairage) chromaticity coordinates.
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제안 방법
The introduced bulky substituents also lead the increased rigidity of molecules, which results in the high efficiency due to reduced vibronic mode and inhibited intermolecular interaction. In this article, we have newly designed novel blue light emitting material, 9,10-bis(3',5'-diphenylphenyl)anthracene (BDA), which contains anthracene as a main core unit and 3',5'-diphenylphenyl group derivative as wings. The introduction of 3',5'-diphenylpheny “wing” which is rigid and bulky, is expected to provide BDA with high efficient blue emission due to intramolecular energy transfer and inhibited intermolecular interaction.
Figure 1 showed the 1H-NMR and 13C-NMR spectra of BDA. Theoretical calculation using PM3 parameterization in the HyperChem
5.0 program (Hypercube), in order to fully optimize the molecular structure, was carried out for the characterization of 3-dimensional structures and the energy densities of HOMO and LUMO states of each material. Figure 2 shows the stereostructure of BDA derived from calculative analysis.
대상 데이터
To study electroluminescent (EL) properties of highly efficient device by using obtained material as emitter, multilayer device with the configuration glass/indium-tin-oxide anode/hole-injection layer (HIL)/hole-transporting layer (HTL)/emitting layer (EML)/electron transporting layer (ETL)/electron-injection layer (EIL)/Al cathode was fabricated. The copper phthalocyanine (CuPc) (20 nm) was used as HIL, 1,4-bis[(1-naphthylphenyl)-amino]biphenyl (α-NPD) (50 nm) as a HTL, DBA (40 nm) as an emitting layer, tris(8-hydroxyquinoline) aluminum (20 nm) (Alq3) as an ETL, LiF (1nm) as an EIL and Al as an cathode. The current-luminance (I-L), voltage-current density (V-I) and current-efficiency (I-eff) characteristics of device based on BDA is shown in Figure 4.
참고문헌 (43)
Yan, M.; Rotherberg, L. J.; Papadimitrakopoulos, F.; Galvin, M. E.; Miller, T. M. Phys. Rev. Lett. 1994, 72, 1104
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