We study electrochemical p- and n-type doping in the well-known light-emitting polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV). Doping reactions are characterized using cyclic voltammetry. Optical measurements including photoluminescence and UV/Vis/NIR transmission were performed on doped samples. We find that oxidation in MEH-PPV is a highly reversible reaction resu...

This paper presents wavelength configurable on-chip solid-state ring lasers fabricated by a single-mask standard lithography. The single- and coupled-ring resonator hosts were fabricated on a fused-silica wafer and filled with 3,3'-Diethyloxacarbocyanine iodide (CY3), Rhodamine 6G (R6G), and 3,3'-Diethylthiadicarbocyanine iodide (CY5)-doped polymer as the reconfigurable gain media. The recorded...

Singlet and triplet–triplet energy transfer in phosphorescent dye doped polymer light emitting devices were investigated. Poly(N-vinylcarbazol) and poly@9,98-di-n-hexyl-2,7-fluorene-alt1,4-(2,5-di-n-hexyloxy)phenylene] ~PFHP! were selected as the host polymer for the phosphorescent dopants fac-tris~2-phenylpyridine! iridium~III! @Ir(ppy)3# and 2,3,7,8,12,13, 17,18-octaethyl-21H,23H-porphyrin pl...

The degradation mechanism of phosphorescent-dye-doped polymer light-emitting diodes ~PLEDs! is investigated. The active medium of our PLED is a polymer blend comprising poly~vinylcarbazole! ~PVK!, @2-~4-biphenylyl!-5-~4-tert-butyl-phenyl!-1,3,4-oxadiazole# ~t-PBD!, and platinum~II!-2,8,12,17-tetraethyl-3,7,13,18-tetramethylporphyrin ~PtOX!. The cyclic voltammetry result shows that the reductive...

In this article, we report the studies of various device architectures of organic lightemitting devices (OLEDs) incorporating highly efficient blue-emitting and ambipolar carriertransport ter(9,9-diarylfluorene)s, and their influences on device characteristics. The device structures investigated include single-layer devices and multilayer heterostructure devices employing the terfluorene as one...

Two new C60-based n-type materials, EGMC-OH and EGMC-COOH, functionalized with hydrophilic triethylene glycol groups (TEGs), have been synthesized and employed in conventional polymer solar cells. With the assistance of the TEG-based surfactant, EGMC-OH and EGMC-COOH can be dissolved in highly polar solvents to implement the polar/nonpolar orthogonal solvent strategy, forming an electron modifi...

Polymer White-light-emitting devices WPLEDs with single layer structures are fabricated by the spincoating method. The device structure used here is indium-tin-oxide(ITO)/polyethylene dioxythiophene(PEDOT:PSS)/polymer blend/Ca/Al, whose blend consists poly N-vinylcarbazole(PVK) hole transporting host polymer, an electron transporting materials 2-4-biphenylyl-5-tert-butylphenyl1,3,4-oxadiazole(P...

We report on the dynamics of photodegradation and subsequent recovery of two-photon fluorescence in a dye-doped polymer. The energy dependence suggests that photodegradation is a linear process, while recovery is entropic. Such recovery could be useful to high-intensity devices such as two-photon absorbers, which can be used in many applications.