Room temperature phosphorescence (RTP) materials have wide applications, and guest/host doping is an important method to achieve RTP. Although weak host–guest interactions (such as hydrogen bonding and π–π stacking) are considered to play a key role in inducing RTP in most doped systems (DSs), stronger and facile coordination bonds can achieve RTP more effectively and are believed to do so in DSs in related research. However, there is a lack of solid experimental evidence. Herein a new stable ligand‐modified lead halide (PCB) is synthesized and used as matrix to prepare RTP NA/PCB DSs with naphthalene derivatives (NA) as guests. Remarkably, a coordination bond between host and guest is experimentally demonstrated and revealed to play a decisive role in the generation of efficient RTP. On this basis, a coordination‐driven doping strategy is proposed to achieve efficient, multicolored, and long‐lived RTP of the DSs. In addition, NA/PCB shows excellent RTP stability and can be used in advanced security encryption, white light emitting diodes, and phosphorescent temperature sensors. This work not only proves the important role of coordination bonds in the RTP DSs, but also shows the potential of the ligand‐modified lead halide matrix as the host material of RTP.
Multistimuli-responsive luminescent materials have wide and promising applications but their designs and syntheses are very challenging.Here, we report a new dual-emitting Eu-based multiemissive coordination polymer (CP, 1) that can respond to different stimuli, i.e., grinding, pH, and aspartic acid (Asp). 1 exhibits a mechanoluminescence (MCL) property with a visible color change (pink ⇌ blue) upon grinding and can be restored upon exposure to dimethylformamide (DMF) vapor. Moreover, it undergoes a reversible color switching (pink ⇌ blue) with the pH interval in the range of 3−4 and can serve as a selective, reusable, and fast ratiometric probe for Asp in aqueous media, with a limit of detection (LOD) down to 2.48 μM. Moreover, a rapid, highly sensitive, and visualizable response to Asp is demonstrated using a CP-based luminescent film and logic device. Detailed mechanism studies including characterization of single-crystal-to-single-crystal transformation reveal that the multistimuli-responsive property is due to the different responses of the two emissions to the mechanical and pH stimuli and the accompanying changes in the energy transfer efficiency from the ligand to the Eu 3+ ion (antenna effect). Multiemissive coordination polymers can be a very promising candidate for multistimuli-responsive luminescent materials with significantly improved functionalities to meet diverse applications.
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