Circularly polarized electroluminescence

M. Oda, H.-G. Nothofer, G. Lieser, U. Scherf, S.C.J. Meskers, and D. Neher, Circularly polarized electroluminescence from liquid-crystalline chiral polyfluorenes, Adv. Mater., 12 362-365, 2000. 

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. 

In addition, chiral oligofluorenes have exhibited circularly polarized electroluminescence with the highest polarization to date, as characterized by the dissymmetry factor, without addition of optical elements external to the OLED device. This device had an efficiency of 0.94 cd A-1 in the deep blue,... 

Fig. 6.14 Molecular structure of a nonafluorene (40) as the emitting layer in the FOLED device shown as the inset in Fig. 6.11 with its circularly polarized electroluminescence spectra and the calculated dissymmetry factor, where ELl and ELr represent the left- and right-handed circularly polarized electroluminescence, respectively, and the dissymmetry factor is as defined for circularly polarized fluorescence in Sect. 6.7.3. Used with permission [51]...

Peelers, E., et al. 1997. Circularly polarized electroluminescence from a polymer light-emitting diode. J Am Chem Soc 119 9909. 

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