Effect of desilylation on the optical and electroluminescence properties of poly[2‐(3‐dimethyldodecylsilylphenyl)‐1,4‐phenylenevinylene]

et al. 2011

Macromol. Res.

The syntheses and characterization of poly(2,6-(4,4-bis(4-((2-ethylhexyl)oxy)phenyl)-4H-cyclopenta[def] phenanthrene)-alt-triphenylamine-4,4'-diyl) (TPA-PCPP), poly(2,6-(4,4-bis(4-((2-ethylhexyl)oxy)phenyl)-4H-cyclopenta [def]phenanthrene)-alt-3,6-(9-(2-ethylhexyl)carbazole)) (3,6-Cz-PCPP), poly(2,6-(4,4-bis(4-((2-ethylhexyl)oxy)-phenyl)-4H-cyclopenta[def]phenanthrene)-alt-2,7-(9-(2-ethylhexyl)carbazole)) (2,7-Cz-PCPP), and poly(2,6-(4,4-bis (4-((2-ethylhexyl)oxy)phenyl)-4H-cyclopenta[def]phenanthrene)-co-2,7-(9-(2-ethylhexyl)carbazole)) (2,7-Cz-co-PCPP) are presented. The carbazole and TPA moieties, which can influence the highest occupied molecular orbital (HOMO) energy level, were introduced to the di-aryl substituted PCPP backbone. The PL spectra of the polymer films showed maximum peaks at approximately 417-429 nm. The devices of the 2,7-Cz-co-PCPPs with the configurations of ITO/PEDOT:PSS/polymers/Ca/Al generated EL emissions with maximum peaks at approximately 460 nm, CIE coordinates of (x =0.16, y=0.033-0.038), turn-on voltages of 4-5 V, maximum brightness of 309-337 cd/m 2 , and luminescence efficiencies of 0.06-0.09 cd/A. The synthesized polymers may be useful for PLED device applications.

Section: Synthesis Of 44'-bis(4455-tetramethyl-132-dioxaborolanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Di-aryl substituted poly(cyclopenta[def]phenanthrene) derivatives containing carbazole and triphenylamine units in the main chain for organic light-emitting diodes

et al. 2011

Macromol. Res.

“…More elaborate diodes have a multilayer structure in which several layers are overlapped for specific functions. 19,20 To facilitate the movement of holes or electrons, an injection layer and a transport layer are inserted between the emitter and the corresponding electrode. 21,22 In this study it was motivated to develop a new PPE derivative for EL device application by combining attractive aspects of PPEs and PPVs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and light‐emitting properties of a novel π‐conjugated poly[di(p‐phenyleneethynylene)‐alt‐ (p‐phenylenecyanovinylene)] containing n‐octyloxy side branches

Lee

J of Applied Polymer Sci

et al. 2008

A novel p-conjugated poly[di(p-phenyleneethynylene)-alt-(p-phenylenecyanovinylene)] having n-octyloxy side chains (PPE-C 8 PPE-PPV) was prepared by polymerization of the monomer DEDB with BCN. Chemical structure of the polymer obtained was confirmed by 1 H NMR, FTIR, and EA. PPE-C 8 PPE-PPV had a molecular weight enough to fabricate the electroluminescent (EL) device, and showed a good organosolubility, excellent thermal stability, and film-forming property. In UV absorption and PL spectra in film it showed a maximum at 430 and 543 nm, respectively, which appeared 5 and 41 nm longer wavelengths than that of the solution, respectively. HOMO, LUMO energy levels and band gap were determined to be 25.70, 23.29, and 2.41 eV, respectively. Two EL devices with low-work function cathodes were fabricated with the structures of ITO/PEDOT/PPE-C 8 PPE-PPV/cathodes (LiF/Al and Mg:Ag/Ag). The both devices exhibited a bright green light emission at 545 nm and the maximum luminescence of 197 cd/cm 2 (LiF/Al) and 158 cd/cm 2 (Mg:Ag/Ag).

“…Various kinds of active materials in electronic devices, such as transistors,1 and flexible organic light‐emitting diodes (OLEDs)2, 3 are made of conjugated polymers. OLEDs have many advantages because of their processability, low driving voltage, wide viewing angle, and easy color tunability over the full range 4–9. It has been demonstrated that to achieve high performance of the OLEDs, good charge injection and charge transporting properties are indispensable 8–16.…”

Section: Introductionmentioning

confidence: 99%

PCPP derivatives containing carbazole pendant as hole transporting moiety for efficient blue electroluminescence

Jin

J. Polym. Sci. A Polym. Chem.

et al. 2009

The syntheses and characterization of poly ((2,6-(4,4-bis(4-((2-ethylhexyl) oxy)phenyl)-4H-cyclopenta[def]phenanthrene))-co-(2,6-(4,4-bis(4-(((9-carbazolyl)hexyl) oxy)phenyl))-4H-cyclopenta[def]phenanthrene)) (BCzPh-PCPPs) and poly((2,6-(4,4-bis (4-((2-ethylhexyl)oxy)phenyl)-4H-cyclopenta[def]phenanthrene))-co-(2,6-(4-(4-(((9-carbazolyl)hexyl)oxy)phenyl)-4-(4-((2-ethylhexyl)oxy)phenyl)-4H-cyclopenta[def]phenanthrene))) (CzPh-PCPPs), with carbazole unit as pendants, are presented. The carbazole moiety, which can improve the hole injection ability, was introduced as a pendant on the PCPP backbone. The devices of the polymers with the configurations of ITO/PEDOT:PSS/polymers/Ca/Al generate EL emission with maximum peaks at 400-450 nm, CIE coordinates of (x ¼ 0.11-0.29, y ¼ 0.11-0.33), low turn-on voltages of 4-6 V, maximum brightness of 60-810 cd/m 2 , and luminescence efficiencies of 0.04-0.22 cd/A. The PL spectra of CzPh-PCPPs films did not show any peak at around 550 nm, which corresponds to keto defect or aggregate/excimer formation, even after annealing for 30 h at 150 C in air. Out of the series, CzPh-PCPP1 (PCPP derivative with 10% of carbazole moiety as pendant) shows blue emission with the maximum brightness of 810 cd/m 2 at 9 V, and the highest luminescence efficiency of 0.22 cd/A at 395 mA/cm 2 .