Boosting the Phosphorescence Efficiency in Doped Organic Crystals: Critical Role of Hydrogen Bonding

Host–guest doping systems with phthalimides (BI) and N-methylphthalimide (NMeBI) as the host and 1,8-naphthalimide (NI) and 4-bromo-1,8-naphthalimide (4BrNI) as the guest have been developed. The 0.2% NI/BI (molar ratio) with a strong C=O···H–N hydrogen bond exhibited a phosphorescence quantum effic...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2023-03, Vol.14 (8), p.2187-2192
Main Authors: Li, Zijuan, Liao, Liyun, Wang, Xiangming, Mu, Yingxiao, Huo, Yanping, Su, Zhong-Min, Liang, Fu-Shun
Format: Article
Language:English
Subjects:
Physical Insights into Materials and Molecular Properties
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Summary:Host–guest doping systems with phthalimides (BI) and N-methylphthalimide (NMeBI) as the host and 1,8-naphthalimide (NI) and 4-bromo-1,8-naphthalimide (4BrNI) as the guest have been developed. The 0.2% NI/BI (molar ratio) with a strong C=O···H–N hydrogen bond exhibited a phosphorescence quantum efficiency (29.2%) higher than that of NI/NMeBI with a weak C=O···H–C hydrogen bond (10.1%). A similar trend was observed in the 4BrNI guest system. A remarkable phosphorescent efficiency of 42.1% was achieved in a 0.5% 4BrNI/BI composite, which represents the highest value in NI-based phosphors. This research indicates stronger hydrogen bonding may have a greater contribution in boosting the phosphorescence efficiency.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.3c00132