Poly emissive layer

DPAs and 1-phenyl-1-alkynes show intense photo- and electroluminescences. A systematic investigation on the luminescence of poly(DPAs) has revealed that these polymers exhibit photoluminescence around 530 nm and electroluminescence around 550 nm. In a similar way, poly(l-phenyl-1-alkynes) photochemically and electrochemi-cally emit strong lights with spectral maxima located around 455 and 470 nm, respectively. Green and blue emissions are observed from the electroluminescent devices using poly(DPAs) and poly(l-phenyl-1-alkynes) as the emission layers, respectively. ... 

Poly[(p-butoxyphenyl)phenylsilane] (PBPPS) has been employed as an emissive layer of an organic EL device.95 PBPPS was spin coated onto an uniaxially oriented poly(diethylsilane) (PDES) ultrathin film. Polarized NUV-EL was observed and the polarization direction was found to be identical with the drawing direction of the friction-transfer process for the PDES film, indicating that PBPPS in the emissive layer was aligned parallel to the uniaxial orientation of PDES. 

The first quantitative study of the device efficiency of polyfluorene LEDs was reported by Grice and co-workers in 1998.5 The LED used ITO-coated glass as the anode, a hole-transport layer of a polymeric triphenyldiamene (poly-TPD), an emissive layer of PFO, and a calcium cathode. A schematic energy-level structure for the device is inset in Fig. 10.14. The injection barrier for holes into poly-TPD is approximately 0.3 eV, much less than that for PFO (0.8 eV), and the injection barrier for electrons into PFO is approximately 0.1 eV. Poly-TPD had excellent film-forming properties, was transparent to PFO emission, and was insoluble in... 

Light emitting diodes (LEDs) have also been fabricated from conjugated polymers such as poly (p-phenylene-vinylene) as the emissive layer [40]. The advances in the chemistry of processible... 

Bright blue electroluminescent devices have been fabricated using poly(9,9-dioctylfluorene) (POF) as an emissive layer, PPV as a hole-transporting layer, tetra-n-butylammonium tetrafluoroborate as a dopant, and a lithium-aluminum alloy as a cathode. ... 

The polymers have been used in different multi-layered devices using PPV as emissive layer. Typical devices were prepared on glass substrates precoated with patterned indium-tin oxide (ITO) electrodes (resistance < 20 Q/square). In a two layer LED, the oxadiazole polymethacrylates (10a or 10b) were spin-coated on top of poly(p-phenylene vinylene) (PPV), prepared on an ITO glass substrate by the sulfonium precursor route (22). Cdcium was used as the top metal contact. A comparable device, but without the polymethacrylate, was fabricated as a reference. Both devices emitted green yellow light under forward bias potential (15 V). 

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