Organic Long Persistent Luminescence Through In Situ Generation of Cuprous(I) Ion Pairs in Ionic Solids

Recent development of most organic long persistent luminescence (OLPL) systems employed binary or tertiary doping. However, the design strategies towards OLPL materials with hour‐long afterglow duration are still quite limited. Here, we propose a novel OLPL system through melt‐casting method with 0....

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Bibliographic Details
Published inAngewandte Chemie International Edition Vol. 60; no. 46; pp. 24437 - 24442
Main Authors Liang, Xiao, Luo, Xu‐Feng, Yan, Zhi‐Ping, Zheng, You‐Xuan, Zuo, Jing‐Lin
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 08.11.2021
EditionInternational ed. in English
Subjects
afterglow duration
Cations
Coordination compounds
CuI complex
Ion pairs
Luminescence
organic long persistent luminescence
organic room temperature phosphorescence
reaction mechanisms
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Summary:Recent development of most organic long persistent luminescence (OLPL) systems employed binary or tertiary doping. However, the design strategies towards OLPL materials with hour‐long afterglow duration are still quite limited. Here, we propose a novel OLPL system through melt‐casting method with 0.1 mol % of CuI complexes: 2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl BINAP‐CuX (X=Cl, Br and I) doped into the triphenylphosphine (TPP) host. The charge separation was initiated prior to excitation through host coordination with CuI complexes, resulting in semi‐free halogen ions and in situ generated CuI cations, which forms TPP + BINAP‐CuX ionic pairs and subsequently ionic solids. The OLPL lifetime can be readily modulated by different halogen atoms and the afterglow can last up to more than 3 hours perceivable to human eyes. This is a rare example of OLPL initiated through host‐guest coordination that could potentially expand the definition of OLPL systems and design strategies. An organic long persistent luminescence (OLPL) system based on in situ generated ionic pairs with CuI centers is proposed and demonstrated. Intermediates are proposed and verified through a series of carefully designed experiments. The afterglow of corresponding blends can last more than 3 hours, thus this mechanism is the first to incorporate CuI ions in OLPL systems.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202110251