Venugopal, Thanikachalam; Palanivel, Jeeva; Jayaraman, Jayabharathi published the artcile< Nondoped blue fluorescent OLED based on cyanophenanthrimidazole-styryl-triphenylamine/carbazole materials>, SDS of cas: 3893-18-3, the main research area is cyano phenanthrimidazole styryl phenylamine carbazole fluorescent blue organic LED.
New 2-(4′-(9H-carbazole-9-yl)-styryl-1H-phenathro[9,10-d]imidazole-1-yl)benzonitrile (SPICN-Cz) and 4-(2-(4-(diphenylamino)phenyl-styryl)-1H-phenathro[9,10-d]imidazole-1-yl)benzonitrile (SPICN-TPA) were synthesized, and their photophys., electrochem., and electroluminescent properties were analyzed in comparison with their cyano-free parent compounds, SPI-Cz, and SPI-TPA. Solvatochromic effects show the transformation of an excited state character from locally excited (LE) state to charge transfer (CT) state. Using time-dependent d. functional theory calculation, the excited state properties of these donor-acceptor blue emissive materials were analyzed. Their excited state properties were tuned by replacing the strong donor triphenylamine to weak donor carbazole to achieve the combination of high photoluminance efficiency locally excited (LE) component and high exciton-using CT component in 1 excited state. Hybridization processes between LE and CT components of SPICN-Cz and SPICN-TPA in the emissive state were discussed. The nondoped organic light emitting diode device based on SPICN-Cz exhibit better electroluminescent performances than those of SPICN-TPA-based device: high external quantum efficiency of 2.58 %, current efficiency of 2.90 cd A-1, and power efficiency of 2.26 lm W-1 with Commission Internationale de l’Eclairage (CIE) coordinates of (0.15, 0.12). The excited state modulation and the composition of LE and CT states in the donor-acceptor system could be useful to design low-cost, high-efficiency fluorescent organic light emitting diode materials.
Journal of Physical Organic Chemistry published new progress about Blue-emitting electroluminescent devices. 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, SDS of cas: 3893-18-3.
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary