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These articles were highlighted on the covers of the Advanced Optical Materials February issue:
Y.-Q. Li, S. Shen, J.-X. Tang, and co-workers demonstrate a wavelength-independent light extraction scheme using nanoimprinted biomimetic quasi-random nanostructures to simultaneously enhance light out-coupling without color distortion and minimize the ohmic losses for multicolored, flexible organic LEDs. A superior color stability over the whole visible light range for wide viewing angles is realized due to the broad periodicity distribution and randomized emission directionality.
Enhancing the electroluminescent efficiency of phosphorescent OLEDs by controlling the horizontal ratio of emitting dipoles (Θ) of Ir(III) complexes is just like a puzzle which can be solved only when a piece of specific shape is sought. S.-H. Jin, J.-J. Kim, and co-workers demonstrate the effect of substituents in the main ligand of Ir-complex on Θ, realizing highly efficient blue phosphorescent OLEDs.
A. R. González-Elipe, H. Míguez, and co-workers demonstrate a self-standing and flexible structure with high mechanical stability and photonic crystal properties. Such structures are obtained by polymer infiltration and subsequent lift-off of a film made by oblique angle physical vapor deposition of alternate layers of columnar SiO2 and TiO2 deposited onto TiO2 nanoparticles.