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- W4281705938 abstract "Six homoleptic Ir(III) complexes bearing imidazo[4,5-b]pyrazin-2-ylidene chelates were successfully designed and synthesized. Narrowband blue emission (λmax = 466–485 nm) and broadened green emission (λmax = 518–532 nm) in degassed toluene solution with high photoluminescent quantum yields in the range of 75–81 and 45–48% were observed for f-timpz, t2impz, and t2empz as well as m-timpz, t2impz, and t2empz, respectively. In addition, the tert-butylphenyl cyclometalate is more electron donating than N-phenyl cyclometalate and, hence, all tert-butylphenyl-substituted derivatives, that is, m- and f-t2impz and m- and f-t2empz, give more red-shifted emission in comparison to that of m- and f-timpz. Moreover, solution-processed OLED with f-t2empz (20 wt %) as the dopant gave electrophosphorescence at 474 nm with maximum external quantum efficiency (max. EQE) of 5.1%, while hyper-OLED with assistant sensitizer f-t2empz (10 wt %) and the multi-resonance thermally activated delayed fluorescence emitter BCzBN (0.5 wt %) afforded narrowband emission centered at 485 nm and max. EQE up to 17.4%, confirming the high potential of this class of Ir(III) metal phosphors." @default.
- W4281705938 created "2022-06-13" @default.
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- W4281705938 date "2022-06-02" @default.
- W4281705938 modified "2023-10-16" @default.
- W4281705938 title "Regioselective Syntheses of Imidazo[4,5-<i>b</i>]pyrazin-2-ylidene-Based Chelates and Blue Emissive Iridium(III) Phosphors for Solution-Processed OLEDs" @default.
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- W4281705938 doi "https://doi.org/10.1021/acs.inorgchem.2c00750" @default.
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