期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 1, 期 1, 页码 272-276出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz900105v
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类别
资金
- 973 Project [2009CB930600]
- NNSFC [20704023, 60876010, 20774043, 60907047]
- Chinese Ministry of Education [208050, 707032]
- NSF of Jiangsu Province [07KJB150082, BK2008053, SJ209003, BK2009423, 08KJB510013, 08KJD150016, 09KJB150009, TJ207035]
- NJUPT [NY207041, NY207038]
Supramolecular steric hindrance (SSH) originates from the combination of the steric hindrance effect of rigid and bulky three-dimensional (3D) moieties with a weak supramolecular interaction. Orthogonally bulky spirobifluorene as a pi-pi stacking SSH model was incorporated into a homoleptic Ir complex. Ir(SFP)(3) with SSH exhibits impressive higher quantum yields and spectral stability than that of its alkyl-substituted counterpart Ir(BFP)(3). The lower turn-on voltage and higher optimized dopant concentration for Ir(SFP)(3) were observed in the proof-in-concept phosphorescent organic light-emitting diodes (PHOLEDs) exhibiting a higher maximum brightness (L-max) of 35481 cd.m(-2), eta(L) of 44.3 cd.A(-1), and eta(P) of 34.8 lm.W-1. The probable supramolecular architectures of dopant-dopant and host-guest interactions were proposed on the basis of molecular modeling.
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