Electronic structures of organic molecular materials for organic electroluminescent devices studied by ultraviolet photoemission spectroscopy

1998 ◽  
Vol 83 (9) ◽  
pp. 4928-4938 ◽  
Author(s):  
Kiyoshi Sugiyama ◽  
Daisuke Yoshimura ◽  
Takayuki Miyamae ◽  
Takafumi Miyazaki ◽  
Hisao Ishii ◽  
...  
Keyword(s):  
Electronic Structures ◽  
Photoemission Spectroscopy ◽  
Molecular Materials ◽  
Electroluminescent Devices ◽  
Organic Electroluminescent ◽  
Ultraviolet Photoemission Spectroscopy

UV Photoemission Study of Interfaces Related to Organic EL Devices

1997 ◽  
Vol 488 ◽  
Author(s):  
Kiyoshi Sugiyama ◽  
Kazuhiko Seki ◽  
Eisuke Ito ◽  
Yukio Ouchi ◽  
Hisao ISHII
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Electronic Structures ◽  
Organic Molecule ◽  
Negative Charge ◽  
Photoemission Spectroscopy ◽  
Level Shift ◽  
Vacuum Level ◽  
Organic Electroluminescent ◽  
Photoemission Study

AbstractInterfacial electronic structures related to organic electroluminescent (EL) devices were studied by UV photoemission spectroscopy (UPS). The two classes of interfaces studied were: (1) interfaces in a typical multilayer device AI/AIq3TPD/ITO, where Alq3 is tris(8-hydroxyquinolino)- aluminum, TPD is N,N×-diphenyl-NN×-(3-methylphenyl)- 1, 1‘-biphenyl-4,4’-diamine, and ITO is indium tin oxide, and (2) TTN/metals and TCNQ/metals interfaces, where TTN is tetrathianaphthacene and TCNQ is tetracyanoquinodimethane. The UPS studies of the specimen formed by the successive deposition of TPD, Alq3, and Al on ITO revealed interfacial energy diagrams, with the vacuum level shift of - 0.25 eV (downward) and - 0.1 eV (downward) at the TPD / ITO and the Alq3 / TPD interfaces, respectively. The deposition of TTN and TCNQ on metals showed opposite direction of the shift of the vacuum level, with the positive and negative charge at the vacuum side. This can be explained by considering the chargetransfer between the metal and the organic molecule, with these directions being consistent with the electron donating and accepting ability of these molecules.

Electronic Structure of Ionic Liquids Studied by UV Photoemission and Inverse Photoemission Spectroscopy

2006 ◽  
Vol 965 ◽  
Author(s):  
Toshio Nishi ◽  
Yasunori Kamizuru ◽  
Kaname Kanai ◽  
Yukio Ouchi ◽  
Kazuhiko Seki
Keyword(s):  
Electronic Structure ◽  
Ionic Liquids ◽  
Electronic Structures ◽  
Band Gaps ◽  
Photoemission Spectroscopy ◽  
Calculated Density ◽  
Inverse Photoemission ◽  
Ultraviolet Photoemission Spectroscopy ◽  
Inverse Photoemission Spectroscopy ◽  
Highest Occupied Molecular Orbitals

ABSTRACTElectronic structures of the ionic liquids were studied by ultraviolet photoemission spectroscopy (UPS) and inverse photoemission spectroscopy (IPES). The sample materials contain 1-buthyl-3-alkylimidazolium ion [Cnmim]+ (n=4, 8, 10) as the cation in combination with fluorine-containing anions (tetrafluoroboronate BF4−, hexafluorophosphate PF6−). Comparing the calculated density of states with the observed spectra, we found that the ionization thresholds of these ionic liquids are determined by the highest occupied molecular orbitals (HOMO) of the cation, although the calculated HOMOs of the isolated anions are higher than that of isolated cation. The combination of the UPS and IPES results reveals that the band gaps of these ionic liquids are determined by only cation.

scholarly journals Electronic Structure of n-Cycloparaphenylenes Directly Observed by Photoemission Spectroscopy

2021 ◽  
Author(s):  
Kaname Kanai ◽  
Takuya Inoue ◽  
Takaya Furuichi ◽  
Kaito Shinoda ◽  
Takashi Iwahashi ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Electronic Structures ◽  
Photoemission Spectroscopy ◽  
Cyclic Structure ◽  
Visible Absorption ◽  
X Ray ◽  
Inverse Photoemission

A series of n-cycloparaphenylenes ([n]CPP) were studied by ultraviolet photoemission, inverse photoemission, ultraviolet-visible absorption, and X-ray photoemission spectroscopy to detect their unique electronic structures. [n]CPP has a cyclic structure in...

Sign in / Sign up

Export Citation Format

Share Document