Abstract: One of the molecular photonics tasks is developing highly efficient electroluminescent devices for illuminating panels and optoelectronic systems. A possible solution, meeting the modern challenges, is thin polymer electroluminescent films instead of light-emitting layers based on low-molecular-weight luminophores [1, 2]. It is necessary to obtain appropriate materials and develop physicochemical approaches to their synthesis to solve the above tasks. Light-emitting polymers (LEPs), which emit complementary colors with controlled chromaticity coordinates under low voltage, attract researchers' attention. The LEPs include a class of conjugated polymers, which are presented by copolyfluorenes (CPFs). The latter ones are obtained by Yamamoto reaction and microwave synthesis with Suzuki coupling [2]. Yamamoto coupling leads to the CPF microblock chain structure. Suzuki coupling allows the alternating comonomeric chain of CPFs. The polymer structure can be modified by green, conducting, and polar groups in a side chain. Film morphology depends on structural units, molecular mass, and temperature treatment. So, it is necessary to investigate preliminary the photoluminescence in solution and bulk to correlate the CPF properties in the dependence on chemical and morphology structures. For instance, embedding end-groups affect films’ morphology and their photophysical properties. Naphthalbenzimidazole moieties provide FRET from fluorene to the Nile red fragments. Polar groups interact with donor-acceptor units and allow getting white emission of PLED.

[1] Vannikov A.V. Polymers with electron conductivity and related devices. Polym. Sci. Ser. A 51, 351–371 (2009), https://doi.org/10.1134/S0965545X 09040014

[2] Smyslov R. Yu., Tomilin F. N., et al., Polymer, V 168, PP. 185-198, (2019), DOI: 10.1016/j.polymer.2019.02.015