LEPDICT’s 2nd stage (2021) simultaneously tackled various tasks: (i) synthesis/acquisition of precursors, intermediates, monomers and/or polymers with specific characteristics (light emission in the green, red, blue, and orange domains); (ii) purification of solvents, reagents, precursors, intermediates, monomers and polymers (if necessary); (iii) optimization of synthetic procedures for the development of chemical species and emitting components (monomers and/or polymers) (if necessary); (iv) the achievement of complex emissive materials by physically blending monochrome luminescent polymers into a single material, in various combinations; (v) optimization of blending process (if necessary); (vi) structural and physico-chemical evaluation of resulting compounds, with emphasis on electro-optical properties and structure-properties correlations; (vii) support activities: dissemination & participation at scientific events.

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The synthetic and analytical efforts from this stage were based on the use of chemical engineering (especially the selection of compatible structural elements and identification of optimal experimental conditions) as a productive tool to properly modulate charge transport, manage the color of emitted light and efficiently optimize optical conduct.

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Most performed activities focused on identifying the optimal combination of structural building blocks (chemical chromophoric tools) in the same macromolecular architecture to successfully develop polymer-based materials capable of emitting light of a certain color, followed by blending them into a white-light-emitting layer. The latter task also implied a multi-level, extensive optimization process, to achieve a satisfactory degree of the emitted white light in solution and/or in solid-state (as confirmed by chromaticity diagrams’ coordinates). 

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Four series of complex emissive building blocks (two red-emissive building blocks, six green-emissive building blocks, five blue-emissive building blocks, two orange-emissive building blocks), four series of monochrome luminescent polymers (one red-emissive polymer, two gren-emissive polymers, three- blue-emissive polymers, one orange-emissive polymer-based material) and nine optimized, emissive polymer blends (seven in solution and two in solid-state) were developed in this manner. 

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Most results obtained throughout Stage 2 were disseminated in the form of three oral presentations and one poster at three international scientific events, and as three papers published in ISI-rated journals (total impact factor: 13.52).

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