Introduction
Polymer guest-host systems composed of a solid polymer matrix and functional molecules such as luminophores are of interest for a broad range of applications in the area of optical information technology and sensors. The use of such composite systems offers a variety of advantages. The polymer matrix contributes, for instance, good film forming capabilities, sufficient adhesion on solid substrates and good mechanical properties. Combination of the effective luminophores with suitable polymers can leads to creation of new advanced optical materials.
Materials: Our work is concerned with development new optical materials based on supramolecular complexes composed of nanodiamonds particles and rare earth elements introducing into polymeric matrix. As guest host systems were involved with amorphous polymer hosts such as polycarbonate, and polystyrene.
Methods: For synthesis luminescent complexes the method template synthesis was used, for fabrication of thin composite films – the spin-coating procedure. The main photophysical characteristics were investigated using the methods luminescent spectroscopy, SEM, time-resolution kinetic spectroscopy.
Results:
Complex of europium with bataphenantrolyne (4,7-diphenyl-1,10-phenantrolyne): Eu(ВPhen)3 and nanodiamonds - ND- [Eu-(BPhen.)2-3] were obtained and on their basis there have been fabricated the composites as polymer films with the thickness of ~300 nm. It was established that in dependence on type of polymer both spectra of luminescence excitation and luminescence of complexes can be change essentially. The fabricated luminescent polymer materials have revealed strong luminescence and high quantum output, up to 70%, enhanced photostability. Besides it, distinguished attribute of such films is excellent adhesion to surface due to presence of nanodiamonds particles.
Fig.1. Spectra of luminescence excitation (1, 2) under λreg. = 613 nm (а) and luminescence (1, 2) under λex. = 300 nm (б) powders: 1 –complex Eu(BPhen)2(NO3)3, 2 – supramolecular complex (ND– Eu(BPhen)2 (NO3)2
Fig.2. Spectra of luminescence excitation (1, 2) under λreg. = 613 nm (left) and luminescence (3,4) under λex. = 300 nm (right) PMMA samples: 1, 3 –complex Eu(BPhen)2(NO3)3, 2, 4 – supramolecular complex (ND– Eu(BPhen)2 (NO3)2
Conclusion: developed new advanced optical materials can be used as luminophors, active components of functional devices, detectors, in microelectronics at manufacture of OLED (polymer nanocomposite materials).
Photonic & plasmonic nanomaterials , Optical properties of nanostructures
