Novel benzochromene and thioarene for organic electronic devices

Design and development of the organic structures with π-conjugated system were interested for using in electronic device such as organic light emitting diodes (OLEDs) and organic field effect transistors (OFETs). In this work, we synthesized π-conjugated of benzochromene (ARAR2 and ARAR3) and thioarene (ARTH2, ARTH3 and THTH2) derivatives via Sonogashira coupling, direct cross-coupling, ruthenium cyclization and Scholl reactions, respectively. All target compounds were characterized by 1H NMR,13C NMR, FT-IR and mass spectroscopy. Moreover, the chemical structure of ARTH2 was clearly characterized by 2D NMR (COSY and HMBC spectroscopy). The photophysical properties of target compounds showed photoluminescence emission which appeared in range of green regions with fluorescence process. The ARTH2, ARTH3 and THTH2 which are thioarene products showed a high thermal stability. After that, all target compounds were studied OLED performance by using the structure of ITO/NPB/MADN: 20%wt of targeted compounds/Bphen/LiF/Al. The results indicated that ARTH2 showed the best performance and exhibited yellowish green colour with maximum luminance at 4,699 cd/m2, current and power efficiencies at 2.71 cd/A and 0.79 Lm/W, resprctively. In addition, the target compounds were investigated in OFETs. It was found that THTH2 showed the p-type character with hole mobility of 1.64x10-2 cm2/Vs and on/off current ration of 6.48