Novel materials with optical properties for anti-counterfeiting paper

Acronym: OPTIPAPER; grant 497PED/02/11/2020; UEFISCDI Code: PN-III-P2-2.1-PED-2019-4825; November 2020 - October 2022

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Stage 1 - Development of photoluminescent materials having R, G, B emission based on polymer composites. Preliminary studies on obtaining complex polymers with unique characteristics, adapted to the obtaining process of secure paper

Stage 2 - Development, preparation, testing of several photoluminescent materials with R, G, B emission based on composites, complex polymers and Carbon Dots with unique characteristics, adapted to the obtaining process of secure paper

During this stage of the project, the aim was to obtain polymeric materials with a high degree of optical transparency under normal ambient lighting conditions, that have intense photoluminescent emission features.

Photoluminescent materials with R, G, B emission based on composites (complex polymers and Carbon Dots nanostructures) having unique features were developed, prepared and tested in order to be adapted to the targeted application (preparation of secure paper).

Experimental protocols have been developed for the preparation of polymeric composites and complex photoluminescent polymers with R, G, B emission.

An experimental protocol has been developed to obtain Carbon Dots with intense photoluminescent emission.

Photoluminescent materials developed for secure paper production were morpho-structurally investigated.

Carbon Dots derived from N-Hydroxyphthalimide were morpho-structurally  investigated.

Fe (III) doped Carbon Dots were also morpho-structurally investigated.

The rheology of the achieved composite materials were investigated.

Details on the activities carried out and the results obtained in this stage are presented in the Technical Report of the 2021 stage:

Technical Report 2021 

Stage 3 - Embedment of Carbon Dots in the paper structure. Laboratory scale validation of secure paper preparation process.

Preliminary tests of the prepared photoluminescent materials have been conducted. The embeddement of newly prepared photoluminescent materials in paper structure has beed assesed.

An experimental design on optical elements of security paper has been developed.

The security paper with optical complex elements prepared at laboratory scale was characterized in terms of physicial and mechanical properties.

Final Report 2022