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Dr. Jin Young Park Dong‐Eun Kim Dr. Ramakrishna Ponnapati Prof. Jong‐Min Kim Prof. Young‐Soo Kwon Prof. Rigoberto C. Advincula 《Chemphyschem》2011,12(5):1010-1015
The electroluminescent (EL) properties of a cross‐linkable carbazole‐terminated poly(benzyl ether) dendrimer, G3‐cbz DN, doped into a PVK:PBD host matrix with a double‐layer device configuration are investigated. Different concentrations of the guest material can control device efficiency, related to chromaticity of white emission and the origin of excited‐state complexes occurring between hole‐transporting carbazole units (PVK or G3‐cbz DN) and electron‐transporting oxadiazole (PBD). Two excited states (exciplex and electroplex) generated at the interfaces of PVK/G3‐cbz DN and PBD result in competitive emission, exhibiting a broad band in the EL spectra. 相似文献
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利用第一性原理对由TPD+和PBD-形成的电致激基复合物(TPD+PBD-)进行基于密度泛函的能量、轨道等性质的计算。结果表明:界面处离子态的TPD+ 和 PBD-更易形成处于更低能量状态的电致激基复合物。几何结构的数据分析表明:电致激基复合物(TPD+PBD-)是电子从PBD-转移至TPD+形成的电荷转移态;电致激基复合物的最低空轨道(LUMO)定域在电致激基复合物PBD- 的一侧;它的最高占据轨道(HOMO)定域在电致激基复合物TPD+的一侧;且前线分子轨道无重叠。电致激基复合物的能隙为1.3 eV,与PBD 的LUMO到TPD的HOMO的能级差1.6 eV相近。在理论上说明了电致激基复合物的发光是从PBD的LUMO到TPD的HOMO的电子跃迁。 相似文献
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White organic light-emitting diodes based on electroplex from polyvinyl carbazole and carbazole oligomers blends
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White organic light-emitting diodes with a blue emitting
material fluorene-centred ethylene-liked carbazole oligomer (Cz6F)
doped into polyvinyl carbazole (PVK) as the single light-emitting
layer are reported. The optical properties of Cz6F, PVK, and PVK:Cz6F
blends are studied. Single and double layer devices are fabricated
by using PVK: Cz6F blends, and the device with the configuration of
indium tin oxide (ITO)/PVK:Cz6F/ tris(8-hydroxyquinolinate)aluminium
(Alq3)/LiF/Al exhibits white light emission with Commission
Internationale de l'éclairage chromaticity coordinates of (0.30,
0.33) and a brightness of 402~cd/m2. The investigation reveals
that the white light is composed of a blue--green emission
originating from the excimer of Cz6F molecules and a red emission
from an electroplex from the PVK:Cz6F blend films. 相似文献
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利用溶液旋涂的方法,通过改变复合功能层中poly(N-vinylcarbazole)(PVK)和N,N′-bis-(1-naph-thyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine(NPB)的质量比,制备结构为indium-tin-oxide(ITO)/PVK:NPB/2,9-dimenthyl-4,7-diphenyl-1,10-phenanthroline(BCP)/Mg:Ag的有机电致发光器件,并对器件的电致发光特性进行了表征。研究结果表明,当复合功能层中PVK和NPB的质量比为1:1时器件性能最好,在该器件的电致光谱中,除了NPB的本征谱峰外,在长波方向还出现了一个位于640nm处的谱峰,这是PVK和NPB产生的电致激基复合物发光,并且随着驱动电压的增加,电致激基复合物的发光强度也相对增强。 相似文献
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利用一种新型有机金属配合物二(2-(4-三氟甲基-2-羟基苯基)苯并噻唑锌(Zn(4-TfmBTZ)2),基于NPB/Zn(4-TfmBTZ)2界面电致激基复合物,制备了一系列异质结量子阱结构有机电致白光器件.结果表明,量子阱结构可以有效提高界面电致激基复合物的发光效率以及器件的显色指数和色度稳定性.得出器件ITO/NPB (60 nm)/Zn(4-TfmBTZ)2(3.0 nm)/NPB (4.0 nm)/Zn(4-TfmBTZ)关键词:
二(2-(4-三氟甲基-2-羟基苯基)苯并噻唑锌
电致激基复合物
量子阱
白光 相似文献
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