Photo- and Electroluminescent Properties of Polymethacrylates with Carbazolyl and Fluorescent Pendant Groups

Abstract

Because polymeric materials have recently found widespread use in light-emitting devices, we decided to exploit a novel group of copolymers as active materials in such devices and managed to obtain polymeric electroluminescent diodes emitting blue light. The electroluminescent devices were fabricated using the copolymers composed of 2-(carbazol-9-yl)ethyl methacrylate (CEM) and 3-phenyl-7-methacryloyloxyethoxy-1-methyl-1H-pyrazolo[3,4-b]-quinoline (MEPQ). The concentration of MEPQ in the copolymers was kept at a low level and changed from 0.5, 1, 2, 5 to 8 mol %. The turn-on voltage for light emission was 8 V. It was found that the emission peaks of the electroluminescent devices were blue-shifted by ≈9 nm in comparison to photoluminescence spectra of the copolymers in thin film. Moreover, as the concentration of MEPQ in the copolymers was increased from 0.5 to 8 mol %, the photoluminescence emission peaks shifted slightly to the red from 447 to 455 nm, while the electroluminescence emission peaks moved from 438 to 447 nm. Because MEPQ groups are bound to the polymer backbone, light emission was equally spread on the whole surface.

Electrochemical formation of polycarbazole films in air- and water-stable room-temperature ionic liquids

“…However, very low yields and high cost are a problem [16][17][18][19]. The strong p-p interaction in the PCz backbone results in the low solubility of PCz; spin-coating, therefore, cannot be employed.…”

Low-potential electrochemical polymerization of carbazole and its alkyl derivatives

“…As reported for many other conjugated polymers, the synthesis of well-defined carbazole polymer has been sustained by the clever utilization of a variety of synthetic tools, such as Kumada, Stille, Yamamoto, Suzuki couplings, etc. [10][11][12][13][14]. Although these conjugated polymers showed interesting electrochemical, electrochromic, electrical, light-emitting, and photorefractive properties, the yield of products obtained from chemical approaches was very low and the synthesis cost was very high.…”

Synthesis and Polymerisation of Novel Methacrylates with Carbazolyl and Benzofuranyl Pendant Groups for Photovoltaic Applications

“…2) and MB (Fig. 3) were prepared through novel synthetic methods that were recently developed in our laboratory [4,5].…”