Abstract
Triplet energy transfer occurs frequently in natural photosynthetic organisms to protect against photo-oxidative stress. For artificial light-harvesting systems, several challenges need to be addressed to realize triplet energy transfer especially in aqueous medium. Specifically, the phosphors should be shielded from water and molecular oxygen, which facilitate to maintain intense emission intensity. Moreover, the donor‒acceptor phosphors should be organized in close proximity, yet simultaneously avoiding direct homo- and hetero-interactions to minimize the potential energy losses. Herein an effective strategy has been developed to meet these requirements, by employing a rod−coil amphiphile as the compartmentalized agent. It renders synergistic rigidifying and hydrophobic shielding effects, giving rise to enhanced phosphorescent emission of the platinum(II) complexes in aqueous environment. More importantly, the donor‒acceptor platinum(II) phosphors feature ordered spatial organization in the ternary co-assembled system, resulting in high light-harvesting efficiency. Therefore, the compartmentalization strategy represents an efficient approach toward color-tunable phosphorescent nanomaterials.
Highlights
Triplet energy transfer occurs frequently in natural photosynthetic organisms to protect against photo-oxidative stress
We study the selfassembly behaviors of rod−coil amphiphile 3
In summary, an effective strategy has been developed toward phosphorescent emission enhancement and triplet light harvesting in aqueous environment
Summary
Triplet energy transfer occurs frequently in natural photosynthetic organisms to protect against photo-oxidative stress. An effective strategy has been developed to meet these requirements, by employing a rod−coil amphiphile as the compartmentalized agent It renders synergistic rigidifying and hydrophobic shielding effects, giving rise to enhanced phosphorescent emission of the platinum(II) complexes in aqueous environment. The D‒A phosphors should be organized with close proximity, yet simultaneously avoiding direct homo- and hetero-interactions, in order to minimize the potential energy losses[22,23,24] Owing to these restrictions, the previous triplet ET systems are mainly performed in crystalline and gel states[25,26], yet rarely explored in the aqueous media[27]. The compartmentalization strategy exemplified in the current study provides a feasible approach toward color-tunable phosphorescent nanomaterials
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