Processes for high efficiency of organic EL devices with dopants

Masaki Yamaguchi, Takao Nagatomo

研究成果: Conference article査読

27 被引用数 (Scopus)


Perylene doped poly(9-vinylcarbazole) (PVCz) was used as a light-emitting layer. The difference between the lowest unoccupied molecular orbital (LUMO) of PVCz and the Fermi level of MgAg cathode is 1.9 eV. Therefore, to decrease this potential difference, 2(4′-tert-butylphenyl)-5-(4′-biphenyl)-1,3,4-oxiadiazole (Bu-PBD) and tris(8-hydroxyquinoline) aluminum (AlQ) layers were inserted between PVCz and MgAg cathode. The copper phthalocyanine (CuPc) layer decreases the barrier height between the Fermi level of ITO anode and the highest occupied molecular orbital (HOMO) of PVCz. These electroluminescence (EL) devices have a wide range luminescent spectral from blue to yellow/green colors by varying doping levels of perylene into PVCz. It was clarified that the luminance and efficiency can be improved by the EL cell structure. Our experimental evidence indicates that the dopant concentration and carrier injection balance have an influence on obtaining high luminance and efficiency.

ジャーナルThin Solid Films
出版ステータスPublished - 2000 3月 1
イベントThe Asia-Pacific Symposium on Organic Electroluminescent Materials and Devices - Hong Kong, Hong Kong
継続期間: 1999 6月 81999 6月 11

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 表面および界面
  • 表面、皮膜および薄膜
  • 金属および合金
  • 材料化学


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