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Abstract
Triarylboranes have drawn much attention in OLEDs owing to their remarkable solid-state luminescence properties. Here two new A-D-A type compounds, 2,7-bis(dimesitylboryl)-N-ethyl-carbazole (BCz) using triarylborane as electron acceptor and carbazole as electron donor while 2,7-bis((4-(dimesitylboryl)phenyl)ethynyl)-9-ethyl-carbazole (BPACz) using phenylacetylene as extra conjugated bridge, have been synthesized and their photoluminescence related properties in various states have been investigated both experimentally and theoretically. Both compounds show blue emission with high quantum yields, being potential candidates for blue OLED materials.
Highlights
Luminescent organic π-conjugated molecules play an important role in modern materials science, life and analytical science, such as optoelectronics, sensors, lasers, smart multi-responsive materials, and bioprobes (Anthony, 2006; Chi et al, 2012; Jun-Jie et al, 2020; Wu et al, 2021)
PMMA is introduced as a transition medium which can exert rigid environment on dispersed molecule, i.e., solid solution
Two aspects of the properties are evaluated, one is the change of the spectral aspect and the other is the evolution of photophysics (PL quantum yield and lifetime)
Summary
Luminescent organic π-conjugated molecules play an important role in modern materials science, life and analytical science, such as optoelectronics, sensors, lasers, smart multi-responsive materials, and bioprobes (Anthony, 2006; Chi et al, 2012; Jun-Jie et al, 2020; Wu et al, 2021). Triarylborane possesses a sp (Chi et al, 2012)-hybridized boron, where an empty pz orbital remaining allows intramolecular electron delocalization in a trigonal planar geometry (Brown and Dodson, 1957), which gives relatively lower unoccupied molecular orbital (LUMO) levels to enhance the electron affinity and tunable highest occupied molecular orbital (HOMO) levels with electron donor groups (Hudson and Wang, 2009; Wade et al, 2010) to produce low energy intramolecular charge transfer (ICT) bands upon photoexcitation (Sakuda et al, 2010), being beneficial for optoelectronics such as organic light-emitting diodes (OLEDs). The two bulky Mes group are twisted from the empty boron pz orbital, and as a consequence, spin-orbital
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