Efficient and chromaticity stable green and white organic light-emitting devices with organic-inorganic hybrid materials.

Efficient inverted bottom emissive organic light emitting diodes (IBOLEDs) with tin dioxide and/or Cd-doped SnO nanoparticles as an electron injection layer at the indium tin oxide cathode:electron transport layer interface have been fabricated. The SnO NPs promote electron injection efficiently because their conduction band (-3.6 eV) lies between the work function ( ) of ITO (4.

Promotional effect of silver nanoparticle embedded Ga-Zr-codoped TiO as an alternative anode for efficient blue, green and red PHOLEDs.

Efficient blue, green and red phosphorescent OLEDs have been harvested from silver nanoparticles embedded at a glass:Ga-Zr-codoped TiO interface. The embedded silver nanoparticles at the interface removed the non productive hole current and enhanced the efficiencies. The blue emitting device (456 nm) with emissive layer Ir(fni) exhibits a maximum luminance () of 40 512 cd m (ITO - 37 623 cd m), current efficiency ( ) of 41.

Hot exciton transition for organic light-emitting diodes: tailoring excited-state properties and electroluminescence performances of donor-spacer-acceptor molecules.

The photophysical, electrochemical and electroluminescent properties of newly synthesized blue emitters with donor-π-acceptor geometry, namely, 4'-(1-(naphthalen-1-yl)-1-phenanthro[9,10-]imidazol-2-yl)-,-diphenyl-(2-[1,1'-biphenyl]vinyl)-4-amine (NSPI-TPA), 4'-(1-(2-methylnaphthalen-1-yl)-1-phenanthro[9,10-]imidazol-2-yl)-,-diphenyl-(2-[1,1'-biphenyl]vinyl)-4-amine (MNSPI-TPA), 4-(2-(4'-(diphenylamino)-(2-[1,1'-biphenyl]vinyl)-4-yl)-1-phenanthro[9,10-]imidazol-1-yl)-1-naphthalene-1-carbonitrile (SPNCN-TPA) and 4-(2-(4-(9-carbazol-9-yl)styryl)-1-phenanthro[9,10-]imidazol-1-yl)naphthalene-1-carbonitrile (SPNCN-Cz) were analyzed. The conjugation length in the emitters is not conducive to pure emission and hence, a molecular twisting strategy was adopted in NSPI-TPA, MNSPI-TPA, SPNCN-TPA and SPNCN-Cz to enhance pure emission. The emissive state (HLCT) of twisted D-π-A molecules containing both LE and CT (HLCT) states was tuned for high PL ( ) (LE) and high exciton utilization ( ) (CT) efficiencies by replacing triphenylamine (strong donor) with carbazole (weak donor).

Efficient donor-acceptor host materials for green organic light-emitting devices: non-doped blue-emissive materials with dual charge transport properties.

Comparative optical, electroluminescence and theoretical studies were performed for ()-4'-(1-(4-(2-(1-(4-morpholinophenyl)-1-phenanthro[9,10-]imidazol-2-yl)vinyl)phenyl)-1-phenanthro[9,10-]imidazol-2-yl)-,-diphenyl-[1,1'-biphenyl]-4-amine (SMPI-TPA) and ()-4-(4-(2-(4-(2-(4-(9-carbazol-9-yl)phenyl)-1-phenanthro[9,10-]imidazol-1-yl)styryl)-1-phenanthro[9,10-]imidazol-1-yl)phenyl)morpholine (SMPI-Cz). These compounds show excellent thermal properties, dual charge transport properties and form thin films under thermal evaporation. Blue OLEDs (CIE: 0.

A hybrid inorganic-organic light-emitting diode using Ti-doped ZrO as an electron-injection layer.

We have fabricated stable efficient iridium(iii)-bis-5-(1-(naphthalene-1-yl)-1-phenanthro[9,10-]imidazole-2-yl) benzene-1,2,3-triol (acetylacetonate) [Ir(NPIBT) (acac)] doped inverted bottom-emissive green organic light-emitting diodes using Ti-doped ZrO nanomaterials as the electron injection layer. The current density () and luminance () of the fabricated devices with Ti-doped ZrO deposited between an indium tin oxide cathode and an Ir(NPIBT) (acac) emissive layer increased significantly at a low driving voltage (V) compared with control devices without Ti-doped ZrO. The Ti-doped ZrO layer can facilitate the electron injection effectively and enhances the current efficiency ( ) of 2.