“…The CIE coordinates for the EL spectra of PEHCNPV and PSi8CNPV are (0.455, 0.532) and (0.330, 0.599), respectively. In particular, PSi8CNPV emits a pure green light with a CIE coordinate that is closer to the standard green (0.30, 0.60) used in high definition television (HDTV) than the CIE values of previously reported green light-emitting polymers. , 5 Electroluminescence spectra of PEHCNPV and PSi8CNPV in devices of configuration ITO/PEDOT/polymer/LiF/Al. Inset: CIE coordinates of the emissions from the PEHCNPV (□) and PSi8CNPV (·) devices.…”
Section: Resultsmentioning
confidence: 84%
“…In particular, PSi8CNPV emits a pure green light with a CIE coordinate that is closer to the standard green (0.30, 0.60) used in high definition television (HDTV) than the CIE values of previously reported green light-emitting polymers. 25,26 The voltage-current density characteristics of the devices fabricated from PEHCNPV and PSi8CNPV are shown in Figure 6. In the forward bias, the turn-on voltages (V T ) of PEHCNPV and PSi8CNPV are 3.0 and 4.0 V, respectively.…”
Novel poly(p-phenylenevinylene) derivatives with an electron-withdrawing cyanophenyl
group on the polymer backbone, poly[2-(2‘-ethylhexyloxy)-5-(4‘-cyanophenyl)-1,4-phenylenevinylene]
(PEHCNPV) and poly[2-dimethyloctylsilyl-5-(4‘-cyanophenyl)-1,4-phenylenevinylene] (PSi8CNPV), were
synthesized via the Gilch polymerization. These polymers were completely soluble in common organic
solvents and showed good thermal stability up to 400 °C. Surprisingly, they showed very high glass
transition temperatures (above 180 °C), indicating that electroluminescenece (EL) devices constructed
from these polymers should have good thermal stability. The presence of the electron-withdrawing
cyanophenyl group lowered the HOMO and LUMO energy levels of PEHCNPV and PSi8CNPV relative
to those of common PPV derivatives. Light-emitting diodes (LEDs) with the configuration ITO/PEDOT/polymer/LiF/Al were fabricated using the novel polymers. The LED devices based on PEHCNPV and
PSi8CNPV exhibited maximum electroluminescence at 546 and 513 nm, respectively. In particular, the
LED device containing PSi8CNPV emitted pure green light with a CIE (Commission Internationale de
L'Eclairage) chromaticity coordinate of (0.330, 0.599), which is very close to that of the standard green
(0.30, 0.60) used for high definition television (HDTV), a maximum external quantum efficiency of 0.67%,
and a maximum brightness of 2900 cd/m2.
“…The CIE coordinates for the EL spectra of PEHCNPV and PSi8CNPV are (0.455, 0.532) and (0.330, 0.599), respectively. In particular, PSi8CNPV emits a pure green light with a CIE coordinate that is closer to the standard green (0.30, 0.60) used in high definition television (HDTV) than the CIE values of previously reported green light-emitting polymers. , 5 Electroluminescence spectra of PEHCNPV and PSi8CNPV in devices of configuration ITO/PEDOT/polymer/LiF/Al. Inset: CIE coordinates of the emissions from the PEHCNPV (□) and PSi8CNPV (·) devices.…”
Section: Resultsmentioning
confidence: 84%
“…In particular, PSi8CNPV emits a pure green light with a CIE coordinate that is closer to the standard green (0.30, 0.60) used in high definition television (HDTV) than the CIE values of previously reported green light-emitting polymers. 25,26 The voltage-current density characteristics of the devices fabricated from PEHCNPV and PSi8CNPV are shown in Figure 6. In the forward bias, the turn-on voltages (V T ) of PEHCNPV and PSi8CNPV are 3.0 and 4.0 V, respectively.…”
Novel poly(p-phenylenevinylene) derivatives with an electron-withdrawing cyanophenyl
group on the polymer backbone, poly[2-(2‘-ethylhexyloxy)-5-(4‘-cyanophenyl)-1,4-phenylenevinylene]
(PEHCNPV) and poly[2-dimethyloctylsilyl-5-(4‘-cyanophenyl)-1,4-phenylenevinylene] (PSi8CNPV), were
synthesized via the Gilch polymerization. These polymers were completely soluble in common organic
solvents and showed good thermal stability up to 400 °C. Surprisingly, they showed very high glass
transition temperatures (above 180 °C), indicating that electroluminescenece (EL) devices constructed
from these polymers should have good thermal stability. The presence of the electron-withdrawing
cyanophenyl group lowered the HOMO and LUMO energy levels of PEHCNPV and PSi8CNPV relative
to those of common PPV derivatives. Light-emitting diodes (LEDs) with the configuration ITO/PEDOT/polymer/LiF/Al were fabricated using the novel polymers. The LED devices based on PEHCNPV and
PSi8CNPV exhibited maximum electroluminescence at 546 and 513 nm, respectively. In particular, the
LED device containing PSi8CNPV emitted pure green light with a CIE (Commission Internationale de
L'Eclairage) chromaticity coordinate of (0.330, 0.599), which is very close to that of the standard green
(0.30, 0.60) used for high definition television (HDTV), a maximum external quantum efficiency of 0.67%,
and a maximum brightness of 2900 cd/m2.
“…There are, to expand a technology founded on eco-friendly materials along nearly limitless availability. This goal becomes achievable day by day, in the evolution of high performance organic screens in the electronic industry [17]. We use the diode technology of organic light-emitting [18] to establish guidelines for organic photovoltaic solar cell OPVCs research.…”
Photovoltaic properties of solar cells based on fifteen organic dyes have been studied in this work. B3LYP/6-311G (d,p) methods are realized to obtain geometries and optimize the electronic properties, optical and photovoltaic parameters for some quinoxaline derivatives. The results showed that time dependent DFT investigations using the CAM-B3LYP method with the polarized split-valence 6-311G (d,p) basis sets and the polarizable continuum model PCM model were sensibly able to predict the excitation energies, the spectroscopy of the compounds. HOMO and LUMO energy levels of these molecules can make a positive impact on the process of electron injection and dye regeneration. Gaps energy ΔE g , short-circuit current density J sc , light-harvesting efficiency LHE, injection driving force ΔG inject , total reorganization energy λ total and open-circuit photovoltage V oc enable qualitative predictions about the reactivity of these dyes.
“…Based on chemical synthesis, a broad variety of organic molecules are produced for applications like organic photovoltaics [1–3], organic light emitting diodes (OLEDs) [4–7], and organic field effect transistors (OFETs) [8, 9]. The possibility of cheap, fast, and easy device fabrication is highly attractive from a commercial and industrial perspective.…”
This work reports on the investigation of the photosensitive polymer poly(diphenyl bicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate) (PPNB), which undergoes the photo-Fries rearrangement upon illumination with UV-light, used as interfacial layers in organic electronic devices. Two cases were investigated: the use of a blend of PPNB with poly-vinylcarbazole (PVK) as an interlayer in para-sexiphenyl (PSP) based organic light emitting diodes (OLEDs) and the use of PPNB as gate dielectric layer in organic field effect transistors (OFETs). The photo-Fries rearrangement reaction causes a change of the polymer chemical structure resulting in a change of its physical and chemical properties. The electroluminescence spectra and emission of the PSP OLEDs are not affected when fabricated with a non-UV-illuminated PPNB:PVK blend. However, the electroluminescence is totally quenched in those OLEDs fabricated with UV-illuminated PPNB:PVK blend. Although the dielectric constant of PPNB increases upon UV-treatment, it is demonstrated that those OFETs built with UV-treated PPNB as gate dielectric have lower performance than those OFETs built with non-UV-treated PPNB. Furthermore, the effect of the UV-illumination of PPNB and PPNB:PVK blend on the growth of the small molecules C60 and PSP has been studied by atomic force microscopy. Using photolithography, this kind of photochemistry can be performed to spatially control and tune the optical and electrical performance of organic electronic devices.
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