Photoluminescence circularly polarized

Circularly Polarized Photoluminescence (CPPL) from Polysilanes 629... 

The emissive counterpart to CD is circularly polarized photoluminescence (CPPL). Where the fluorophore is chiral, then the photo-excited state can return to the ground state with emission of circularly polarized light, the direction of polarization of which depends on the relative intensities of the right-handed and left-handed emissions (/r and /L, respectively), which in turn depends on the chirality of the material, or more accurately, the chirality of the photo-excited state of the material. CPPL studies on poly silanes are extremely rare, however, due to the low CPPL intensity and rapid sample degradation in solution, and problems due to artifacts in the solid state. 

MLX plots and electron count, 1, 36 MLX plots and ligand bond number, 1, 42 MLX plots and reactivity patterns, 1, 42 MLX plots and valence, 1, 40 multicenter bonding, 1, 32 pi- and delta-backbonding, 1, 29 pi-donation considerations, 1, 29 Covalent character, dn configuration compounds, 1, 20 Covalent interaction studies, and bis(arene)chromium, 5, 345 CPPL, see Circularly polarized photoluminescence Crabtree s catalyst, for iridium dihydride complexes,... 

Analogous g-values may be defined for the degree of circular polarization in emission [or circularly polarized photoluminescence (CPPL)] and circularly polarized electroluminescence (CPEL), eg. gCppL = 2(JL - 1R)/(1L + 1r), where IL and IR denote the intensity of left- and right-handed circularly polarized emission, respectively. CPPL should not be confused with fluorescence-detected CD. 

R.K. Vijayaraghavan, S. Abraham, H. Akiyama, S. Purumi, N. Tamaoki, S. Das, Photoresponsive glass-forming butadiene-based chiral liquid crystals with circularly polarized photoluminescence. Adv. Funct. Mater. 18, 2510-2517 (2008)... 

D. Katsis, A.W. Schmid, S.H. Chen, Mechanistic insight into circularly polarized photoluminescence from a chiral-nematic film. Liq. Cryst. 26, 181-185 (1999)... 

Fig. 6.12 Right (PLr) and left (PLl) circularly polarized photoluminescence from a light-emitting chiral nematic liquid crystal, whose photoluminescence spectrum overlap its stop-band. The dotted line shows the stop-band, where transmission of right-hand circularly polarized light is forbidden...

Woon, K.L., O NeiU, M., Richards, G.J., Aldred, M.P., Kelly, S.M., Fox, A.M. Highly circularly polarized photoluminescence over a broad spectral rtmge from a calamitic, holetransporting, chiral nematic glass and from tm indirectly excited dye. Adv. Mater. 15(18), 1555-1558 (2003). doi 10.1002/adma.200304960... 

BMW Langeveld-Voss, R Janssen, MPT Christiaans, SCJ Meskers, HPJM Dekkers, and EW Meijer, Circular dichroism and circular polarization of photoluminescence of highly ordered poly 3,4-di[(5)-2-methylbutoxy]thiophene, J. Am. Chem. Soc., 118 4908 -909, 1996. 

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