期刊
DALTON TRANSACTIONS
卷 51, 期 9, 页码 3652-3660出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1dt03212g
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资金
- Bu-Ali Sina university
A strategy of chemical modification was used to design and synthesize efficient near-infrared light-emitting electrochemical cells with high emission wavelength and EQE values, as well as increased lifetime and decreased turn-on time.
From the practical point of view, the stability, response time and efficiency of near-infrared light-emitting electrochemical cells (NIR-LECs) are key factors. By using the high potential of chemical modification potential of the phenanthroimidazole ligand, three new binuclear ruthenium(ii) complexes with an alkyl spacer as the NIR-emitter were designed and synthesized. NIR-LECs based on these complexes exhibit near-infrared emission at the maximum wavelength of up to 705 nm and with an EQE of up to 0.72% at 4.0 V, which are among the highest values for NIR-LECs based on cationic binuclear ruthenium(ii) complexes reported so far. The lifetimes of NIR-LECs based on binuclear complexes were increased about 1.5-to-4-fold with respect to the ones based on mononuclear complexes. Furthermore, a significant decrease in the turn-on time of NIR-LECs by chemical tethering of a new ionic methylpyridinium moiety from 6.3 to 1.4 minutes was observed. It seems that this combinational modification approach can open a new avenue for practical applications.
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