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POLYMER-GRAPHENE TERNARY LUMINESCENT COMPOSITES

POLYMER-GRAPHENE TERNARY LUMINESCENT COMPOSITES. Alexander V. KUKHTA Research Institute for Nuclear Problems, Belarusian State University, Minsk, Belarus; e-mail: al.kukhta@gmail.com; kukhta@bsu.by Polina KUZHIR, Sergey MAKSIMENKO

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POLYMER-GRAPHENE TERNARY LUMINESCENT COMPOSITES

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  1. POLYMER-GRAPHENE TERNARY LUMINESCENT COMPOSITES Alexander V. KUKHTA Research Institute for Nuclear Problems, Belarusian State University, Minsk, Belarus; e-mail: al.kukhta@gmail.com; kukhta@bsu.by Polina KUZHIR, Sergey MAKSIMENKO Research Institute for Nuclear Problems, Belarusian State University, Minsk, Belarus; Pawan KHANNA Defense Institute of Advanced Technology, Deemed University, Pune, India Stefano BELLUCCI National Institute for Nuclear Physics, Frascati National Laboratory, Frascati, Italy

  2. OUTLINE • goal of study • types of luminescent nanocomposites • advantages • possible applications

  3. INTEREST TO CONDUCTING MATERIALS WITH DIFFERENT PROPERTIES: CONDUCTING LUMINESCENT MATERIALS FOR: LIGHT-EMITTING DEVICES SOLAR CELLS SENSORS

  4. WHY ELECTROACTIVE POLYMER-GRAPHENE BASED TRIPLE COMPOSITES? POLYMER: Easy processing, good matrix, but: no conductivity and not enough stability ELECTROACTIVE POLYMER: not enough conductivity, better interaction with filler GRAPHENE: High charge mobility, stability, inertness, but in nanoplatelets: a lot of defects decrease conductivity strongly Addition of graphene improves strongly polymer conductivity Insertion of the third luminescent component can give new conducting material with luminescent properties Problem: conducting materials quench luminescence

  5. LUMINESCENT ADDITIVES • Luminescent polymer • Luminescent organic small molecules • Luminescent inorganic quantum dots • Luminescent carbon nanomaterials

  6. INTRINCICALLY CONDUCTING POLYMERS Polymers have traditionally held advantages over metal or inorganic materials, such as easy synthesis and processing, chemical and structural diversity, low weight, and flexibility polypyrrol polythiophene PPP luminescent PANI

  7. Graphene nanoplatelets as nanofiller INSERTION TO POLYMER INCREASES CONDUCTIVITY STRONGLY

  8. ABSORPTION SPECTRUM of GRAPHENE

  9. RAMAN SPECTRA AFTER ADDING OF NANOPARTICLES

  10. POLYMER-GRAHENE BASED LUMINESCENT COMPOSITES INTEREST TO LUMINESCENT COMPOSITES INSPITE OF QUENCHING IS TO ELUCIDATE MECHANISMS AND POSSIBILITY OF CONTROL OF QUENCHING Possible processes: Energy transfer between components Charge transfer between components For a number of luminescent polymers we did not found good candidate for low quenching

  11. LUMINESCENCE OF TRIPHENYLPYRIDINATE IRIDIUM WITH GNP Typically: strong luminescence quenching of luminescing objects by nanocarbons. We observed only 33% quenching of iridium complex.

  12. LUMINESCENT COMPOSITES PEPK+GRAPHENE+CdSe/CdS NANOPLATELETS PEPK structure Energy diagram Solution characteristic CdSe

  13. LUMINESCENCE OF NANOPLATELETS AND COMPOSITE

  14. LOCAL LUMINESCENCE DISTRIBUTION AND SPECTRA PEPK+ GNP+ CdSe NPL 1. GOOD ENOUGH LUMINESCENCE IS OBSERVED FROM SEMITRANSPARENT FILMS 2. QUENCHING EFFICIENCY IS DIFFERENT IN DIFFERENT POINTS 3. TWO PEAK SPECTRA ARE OBSERVED IN PLACES WITH STRONG INTERACTION

  15. LUMINESCENT COMPOSITES MEH-PPV+GRAPHENE+CdSe NANOPARTICLES

  16. LOCAL LUMINESCENCE DISTRIBUTION AND SPECTRA MEH-PPV+ GNP+ CdSe QD 1. GOOD ENOUGH LUMINESCENCE IS OBSERVED FROM SEMITRANSPARENT FILMS 2. QUENCHING EFFICIENCY IS DIFFERENT IN DIFFERENT POINTS 3. Diameters are different in different points 4. Less quenching is observed in physically prepared GNP as compared to RGO

  17. Film resistance measurements Film resistance measurements

  18. Promising applications of luminescent conducting nanocomposites in many areas: -optics, -electronics, -energy, -environment, -biology, -medicine, -functional smart coatings (photo- and electrochromic devices, EMI shielding, etc.), -solar cells, -catalysts, -sensors, -light-emitting devices -etc.

  19. CONCLUSIONS • 1. Graphene nanoplatelets functionalized with luminescent nanoparticles has good prospects for wide application in electronics and other manifold fields. • 2. Polymer nanocomposites based on above fillers are attractive for creation conductive and luminescent thin films made by printing technologies for development of manifold electronic devices. • 3. The lowest luminescence quenching is obtained for Ir(ppy)3

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