Owing to their unique features organic light emitting diodes (OLEDs) are considered as promising alternative for smart displays and solid state lightings.1 A series of luminophores were designed and synthesized for optoelectronics and selective nitroaromatic detection. All the luminophores showed deep blue emission in solution, thin-film and solid phase with reasonable quantum yield as well as good thermal stability (5% weight loss at 258  296○C). Furthermore, the m-CF3PTPI derivatives were used as emitters for fluorescent OLEDs and host (m-CF3PTPI-1 and m-CF3PTPI-2) for triplet dopant in PhOLEDs. All the doped devices exhibited near-UV emissions with EL peaks raising ~380395 nm with CIEy ~0.09. Of all the devices, m-CF3PTPI-5(3 wt%) based device displayed maximum EQE (EQEmax) of 2.8%, power efficiency (PEmax) of 0.9 Im/W, current efficiency (CEmax) of 1.3 cd/A, and the brightness of 953 cd/m2. Furthermore, m-CF3PTPI-1 and m-CF3PTPI-2 possessing triplet energy of 2.67 and 2.63 eV, respectively, were used as host for efficient green (Ir(ppy)3-2.4 eV) PhOLEDs. The m-CF3PTPI-2 based device achieved EQEmax (4.8%), CEmax (17.5 cd/A), PEmax (13.4 lm/W), and maximum brightness (Lmax) of 4695 cd/m2, much higher than that of counterpart m-CF3PTPI-1 based OLED. Taking advantage of the structural functionality, the luminophores were used for the detection of nitro aromatic compounds (including picric acid (PA)). All the luminophores showed good selectivity and high sensitivity towards the PA and the sensing mechanism was carefully investigated by using NMR and DFT analysis.

Benzil-Imidazole based Luminophores as Near UV/Deep blue emitters/Host for OLEDs and Selective Picric Acid Detection

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27th CRSI National Symposium in Chemistry

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