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Published on: December 27, 2018
Triplet energy transfer competition in Mn2+-doped (Ph3S)2CdCl4 enables afterglow-green emission switching
Abstract:
Organic-metal halides exhibiting room-temperature phosphorescence (RTP) show significant potential in optoelectronic devices. Here, a novel zero-dimensional compound, (Ph3S)2CdCl4, is reported, which displays blue fluorescence at 390 nm and green persistent luminescence at 520 nm under UV excitation. The [CdCl4]2- unit enhances the persistent emission by transferring energy to the triplet state of the triphenylsulfonium cation. Upon Mn2+ doping, a competitive energy transfer pathway switches the system to green fluorescence at 520 nm and completely quenches persistent luminescence. Excitation/emission spectra and time-resolved photoluminescence confirm this mechanism. Based on these properties, the pure-phase material enables visualization of laser paths, and Mn-doped samples are used to fabricate high-color-purity green LEDs. This work provides a new strategy, to the best of our knowledge, for regulating persistent luminescent materials through competitive energy transfer pathways.
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