Chengfeng Qiu - IEEE Xplore Author Profile

Showing 1-9 of 9 results

Filter Results

Show

Results

Praseodymium oxide (Pr/sub 2/O/sub 3/) coated platinum (Pt) was investigated as a composite hole-injection layer for "top-emitting" organic light-emitting diodes (OLEDs) based on copper (II) phthalocyanine-N, N'-diphenyl-N, N' bis(3-methylphenyl-1, 1'-biphenyl-4, 4'-diamine-tris-8-hydroxyquinoline aluminum. Aluminum was used as the current-carrying and reflecting anode electrode underneath the com...Show More
The characteristics of organic light-emitting diodes depend critically on the arrangement and choice of the constituent organic layers. Diodes constructed using poly(vinylcarbazole) doped with phosphorescent fac tris(2-phenylpyridine) iridium (III) [Ir(ppy)/sub 3/] as the polymer hole-transport layers and aluminum (III) bis(2-methyl-8-quinolinato) 4-phenylphenolate as hole-blocking and electron-tr...Show More
A new silole derivative, 1,2,3,4,5-pentaphenyl-1-(8-phenyl-1,7-octadiynyl)silole, is synthesized, characterized, and used as the electron-transport/emission layers in organic light-emitting diodes. Blue emission at 492 nm is observed, with a maximum luminance of 10 460 cd/m/sup 2/ at 18 V. The respective maximum current and power efficiencies are 8.47 cd/A and 3.8lm/W. A triple-layer composite cat...Show More
OLED devices based on hexaphenylsilole (HPS) have been fabricated. These devices emit very bright greenish-blue light, up to 55880 cd/m/sup 2/ at 16 V. Emission starts at 2.6 V, and reaches 100-cd/m/sup 2/ and 10790-cd/m/sup 2/ at 5 V and 10 V respectively. The maximum electroluminescence (EL) efficiency and power efficiency are 20-cd/A and 12.8-lm/W, respectively. The maximum external quantum eff...Show More
The electrophosphorescent emission properties were investigated in polymer light-emitting diodes (PLEDs) based on a poly(9-vinylcarbazole) (PVK) doped with a green phosphorescent dye of fac-tris(2-phenylpyridine) iridium (III) [Ir(ppy)/sub 3/]. A green light peaked at 516 nm was emitted from devices with a configuration of ITO/PEDOT:PSS/PVK:Ir(ppy)/sub 3//BCP/Alq/sub 3//LiF/Al. The optimal doping ...Show More
The performance of top-emitting organic light-emitting diodes depends not just on the choice of the transparent cathodes but also on their techniques of formation. Compared to the damage induced by radio frequency sputtering of indium-tin oxide cathode, that induced by DC sputtering was verified to be less severe and relatively independent of the sputtering power. Consequently, a high DC sputterin...Show More
Organic light-emitting diodes made of tris-8-(hydroxyquinoline) aluminum as the electron-transport layers, N, N'-diphenyl-N, N' bis (3-methylphenyl)-1, 1'-biphenyl-4,4'-diamine (TPD) as the hole-transport layers, and 2-1, 1-dimethylethyl-62-2, 3, 6, 7-tetrahydro-1, 1, 7, 7-tetramethyl-1H, 5H-benzo(ij) quinolizin-9-yl ethenyl-4H-pyran-4-ylidene propanedinitrile (DCJTB) as the guest dopant have been...Show More
The dependence of the current and power efficiencies of bi-layer organic light-emitting diodes (OLEDs) on the thickness of the constituent organic layers is reported. The thickness of the electron and hole transport layers was simultaneously varied to determine the optimal configuration for power efficiency. It was verified that the inclusion of a suitable electrode buffer layer reduced the effect...Show More
Active matrix (AM) flat-panel displays (FPDs) based on organic light-emitting diodes (OLEDs) are being hotly pursued as alternatives to liquid crystal displays (LCDs). Unlike LC pixels, which are voltage-driven, OLED pixels are current-driven, Since the amorphous silicon (a-Si) thin-film transistors (TFTs) typically used in LCDs suffer from limited current-driving capability and high photosensitiv...Show More