Multifunctional 4,5-Diphenyl-1H-imidazole-Based Luminogens as Near UV/Deep Blue Emitters/Hosts for Organic Light-Emitting Diodes and Selective Picric Acid Detection

Nayak, Sandhya Rani and Shahnawaz, - and Siddiqui, Iram and Jou, Jwo-Huei and Patel, Sabita and Vaidyanathan, Sivakumar (2023) Multifunctional 4,5-Diphenyl-1H-imidazole-Based Luminogens as Near UV/Deep Blue Emitters/Hosts for Organic Light-Emitting Diodes and Selective Picric Acid Detection. The Journal of Physical Chemistry C, 127 (1). pp. 499-515. ISSN 1932-7447

Text
acs.jpcc.2c05220.pdf - Published Version
Download (10MB)

Abstract

A series of luminophores (construction of diphenylimidazole (m-CF3PTPI) groups functionalized at the N1-positions of imidazole groups) were purposefully designed and synthesized for optoelectronics and for selective detection of nitroaromatic compounds. The luminophores showed deep blue emission in solution, solid, and thin-film matrix with acceptable quantum yield and good thermal stability (5% weight loss at 258–296 °C). From electrochemical analysis as well as theoretical calculations, the energy gaps of HOMO–LUMO are found to be in good agreement and all of them showed good triplet energy. The luminophores can be explored as hosts for phosphorescent organic light-emitting diodes (PhOLEDs). Furthermore, the m-CF3PTPI derivatives were used as emitters for fluorescent OLEDs and hosts (m-CF3PTPI-1 and m-CF3PTPI-2) for triplet dopants in PhOLEDs. Near-UV emissions were observed for all the doped devices that exhibited electroluminescence (EL) peaks at ∼380–395 nm with a Commission International deL’Eclairage (CIEy) coordinate of ∼0.09. Of all the devices, the m-CF3PTPI-5 (3 wt %)-based device demonstrated a maximum external quantum efficiency (EQEmax) of 2.8%, power efficiency (PEmax) of 0.9 lm/W, current efficiency (CEmax) of 1.3 cd/A, and brightness of 953 cd/m2. Moreover, the device was further optimized using a different host approach. SimCP2 displayed the best performance by achieving a high EQEmax of 4.0% that is near the theoretical limit of fluorescent materials.

[error in script]

IITH Creators:

IITH Creators	ORCiD
Vaidyanathan, Sivakumar	http://www.orcid.org/0000-0002-2104-2627

Item Type:

Article

Uncontrolled Keywords:

Aromatic compounds; Fluorescence; Luminance; Organic light emitting diodes (OLED); Quantum efficiency; Supercomputers;Deep blue emitters; Functionalized; Imidazol; Lightemitting diode; Luminophores; Nitroaromatic compound; Organic light-emitting; Phosphorescent organic light-emitting diodes; Picric acid; Triplet energy;Electroluminescence

Subjects:

Chemistry
Chemistry > Physical chemistry

Divisions:

Department of Chemistry

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

16 Aug 2023 11:25

Last Modified:

16 Aug 2023 11:25

URI:

http://raiithold.iith.ac.in/id/eprint/11543