Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 11, Issue 36, Pages 12270-12279Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3tc02398b
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In this study, three Ir(iii) based carbene complexes were synthesized and characterized. These complexes exhibited sky-blue emission and high photoluminescent quantum yields. One of the complexes showed high efficiency and external quantum efficiency in blue OLED devices.
Ir(iii) based carbene complexes are highly sought after in the field of organic light-emitting diodes (OLEDs), as they are expected to solve the thorny issue of efficient and durable blue phosphors. Hence, three tris-bidentate Ir(iii) based carbene complexes, namely, f-ct4a-c, were synthesized and fully characterized by both spectroscopic and structural methods, presenting a bulky 2,6-dimethylphenyl substituent on the imidazo[4,5-b]pyrazin-2-ylidene fragment, and a distinctive N-aryl (i.e., either phenyl or 4-t-butylphenyl) appendage and cyclometalating group. These complexes exhibited sky-blue emission with a peak max. located between 473 and 482 nm and a photoluminescent quantum yield (PLQY) of 50-68% recorded in degassed toluene, and furthermore, a much-improved PLQY of 71-87% upon doping in the 2,8-bis(diphenylphosphoryl)dibenzo[b,d]thiophene (PPT) host matrix. Remarkably, the f-ct4b based OLED device and respective hyper-OLED device exhibited blue Commission Internationale de L'Eclairage CIEx,y coordinates of (0.19,0.47) and (0.11,0.44), and max. external quantum efficiencies (EQEs) of 17.4% and 21.5%, respectively, demonstrating their potential in future OLED applications.
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