Optical properties, spectroscopy blue-shift

Misra et al. [113] have reported the synthesis and optical/electrical properties of new 5-coordinated Al-complexes designed as Alq(l) and Alq(2). The complexes are vacuum evaporable as well as soluble in many organic solvents. EL peaks of these new complexes emit in the range 522-523 nm, which is nearly 8 nm blue shifted compared to that of Alq3. The chemical structures of the complexes were determined with the help of the Hydrogen Nuclear Magnetic Resonance (HNMR) and Fourier Transform Infrared (FTIR) spectroscopy techniques. The structure of these complexes is shown in Fig. 4.13. 

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