Photoluminescence, conjugated

B. Liu, W.-L. Yu, Y.-H. Lai, and W. Huang, Synthesis of a novel cationic water-soluble efficient blue photoluminescent conjugated polymer, Chem. Commun. 551-552, 2000. 

Abstract Photoluminescent conjugated organic polymers have been applied to the... 

Hide, R, et al. 1997. Highly photoluminescent conjugated polymers Stimulated emission and device applications. Proc SPIE 3145 36. 

K. Akagi, J. Oguma, H. Shirakawa, Photoluminescent conjugated polymers with liquid crystallinities, J. Pho-topolym. Sci. Technol., 11, 249-252 (1998). 

For copolymers of structure I, for both types of side-chains, there is a striking similarity with the optical properties of the corresponding models the absorption and photoluminescence maxima of the polymers arc only 0.08-0.09 eV red-shifted relative to those of the models, as shown in Figure 16-9 (left) for the octyloxy-substituted compounds. The small shift can be readily explained by the fact that in the copolymers the chromophorcs are actually substituted by silylene units, which have a weakly electron-donating character. The shifts between absorption and luminescence maxima are exactly the same for polymers and models and the width of the emission bands is almost identical. The quantum yields are only slightly reduced in the polymers. These results confirm that the active chro-mophores are the PPV-type blocks and that the silylene unit is an efficient re-conjugation interrupter. 

The role of disorder in the photophysics of conjugated polymers has been extensively described by the work carried out in Marburg by H. Bassler and coworkers. Based on ultrafast photoluminescence (PL) (15], field-induced luminescence quenching [16J and site-selective PL excitation [17], a model for excited state thermalizalion was proposed, which considers interchain exciton migration within the inhomogenously broadened density of states. We will base part of the interpretation of our results in m-LPPP on this model, which will be discussed in some detail in Sections 8.4 and 8.6. 

Various 1,5-dibromoquinoxalines have been polymerized by organometallic dehalogenation (Fig. 5.41). The reaction takes place in DMF with (1,5-cyclooctadiene) Ni(0) in the presence of 2,2 -bipyridine at 60°C for 48 h.168169 Highly conjugated acenaphthene quinoxalines were prepared by this procedure and exhibit photoluminescence peaks at 400 and 514 nm.170... 

Uld aviolet spectroscopy and photoluminescence are used to study the optical properties of polymers. These spectra provide information about the conjugation along die polymer backbone and the photo behavior of die polymers. 

The introduction of bulky side chains that contain adamantyl groups to poly(p-phenylenevinylene) (PPV), a semiconducting conjugated polymer, decreases the number of interchain interactions. This action will reduce the aggregation quenching and polymer photoluminescence properties would be improved [93]. 

Many of the linear conjugated tricyclic systems have interesting fluorescence or other electrophysical properties. Bis-pyrazolepyridines such as compound 30 have been incorporated into polymers as fluorescent chromophores <1999JMC339>, and used in doped polymer matrices <1997JMC2323>. They are electroluminescent at 425 nm and photoluminescent at 427 and 430 nm in a poly(vinylcarbazole) matrix with a quantum efficiency of 0.8. 

NC Greenham, IDW Samuel, GR Hayes, RT Phillips, YARR Kessener, SC Moratti, AB Holmes, and RH Friend, Measurement of absolute photoluminescence quantum efficiencies in conjugated polymers, Chem. Phys. Lett., 241 89-96, 1995. 

M. Ariu, D.G. Lidzey, M. Sims, A.J. Cadby, P.A. Lane, and D.D.C. Bradley, The effect of morphology on the temperature-dependent photoluminescence quantum efficiency of the conjugated polymer poly(9,9-dioctylfluorene), J. Phys. Condens. Matter, 14 9975-9986, 2002. 

Q.D. Ling, E.T. Kang, K.G. Neoh, and W. Huang, Synthesis and nearly monochromatic photoluminescence properties of conjugated copolymers containing fluorene and rare earth complexes, Macromolecules, 36 6995-7003, 2003. 

M.R. Andersson, M. Berggren, T. Olinga, T. Hjertberg, O. Inganas, and O. Wennerstrom, Improved photoluminescence efficiency of films from conjugated polymers, Synth. Met., 85 1383-1384, 1997. 

K.Y. Musick, Q.-S. Hu, and L. Pu, Synthesis of binaphthyl-oligothiophene copolymers with emissions of different colors systematically tuning the photoluminescence of conjugated polymers, Macromolecules, 31 2933-2942, 1998. 

W.-S. Li, D.-L. Jiang, and T. Aida, Photoluminescence properties of discrete conjugated wires wrapped within dendrimeric envelopes "dcndrimer effects on -ir-electronic conjugation, Angew. Chem. Int. Ed., 43 2943-2947, 2004. 

Park HJ, Vak D, Noh YY, Lim B, Kim DY (2007) Surface plasmon enhanced photoluminescence of conjugated polymers. Appl Phys Lett 90 161107... 

---