Introduction to the Physics of Organic Semiconductors

Optical spectra obtained from amorphous films of rubrene: Evidence for predominance of twisted isomer

“…Organic semiconductors have become very promising and actively investigated materials [1,2,3]. Due to their specific optical properties organic molecules are particularly interesting for various device applications such as light emitting diodes, field effect transistors and solar cells [4,5,6].…”

Hybrid white organic light-emitting diode with a mixed-host interlayer processed by organic vapor phase deposition

“…3, the triplet energy levels of the different organic materials and possible triplet exciton diffusion paths are qualitatively shown. By short range (<1 nm) Dexter transfer, 12 triplet excitons can diffuse from Irppy to TER031 molecules. Quenching at the TER031/NPB interface is prevented due to the higher triplet energy level of NPB.…”

Measurement of photo‐patterned surface potential of Alq3 thin films by Kelvin‐force microscope together with near‐field optical stimulation

“…[1] Among the major organic semiconductors for OLEDs, tris(8-hydroxyquinolinato) aluminum(III) (Alq 3 ) has been intensively investigated as a material for an electron transport layer. [1,2] In 2002, Ito et al have reported unusual behaviors of surface potential of Alq 3 thin films prepared by vacuum deposition.…”

“…[1] Among the major organic semiconductors for OLEDs, tris(8-hydroxyquinolinato) aluminum(III) (Alq 3 ) has been intensively investigated as a material for an electron transport layer. [1,2] In 2002, Ito et al have reported unusual behaviors of surface potential of Alq 3 thin films prepared by vacuum deposition. [3] The unusual behaviors are that (i) an extremely high surface potential is spontaneously formed when an Alq 3 film is prepared by vacuum deposition in the dark, (ii) the surface potential is proportional to the Alq 3 film thickness (approximately 50 V/µm), and (iii) photo-exposure reduces the surface potential to almost zero.…”