or noble transition metals, pure organic systems with RTP have received considerable achievements recently. [3] Generally, the lifetime and quantum efficiency are difficult to exceed 10 ms and 20% for pure organic materials because their intersystem crossing (ISC) is inherently inefficient and the active triplet state is readily exhausted through nonradiative relaxation. [4] To address this issue, most efforts have been focused on designing organic RTP molecules with ultralong lifetime and/or higher quantum efficiency. [5] For instance, phosphorescence with lifetime long as 2.81 s and efficiency high to 76% has been recently obtained from a phosphor monomer by polymerization and complexation synergistic enhancement. [5a] In addition, the modulation of phosphorescence color of RTP materials has also attracted enormous attention very recently. [6] A series of host-guest phosphors with color variation from cyan (502 nm) to orange-red (608 nm) have been achieved by modulating different chromophore guests. [6a] Notably, compared with the multicolor phosphorescence realized by multiple components, single-component phosphors with tunable RTP colors are extremely attractive because of their potential superiorities in simple fabrication and device stability for practical applications. [7] However, it is well known that the observed emission is generally determined by the lowest excited state according to Kasha's rule, thus it is extremely difficult to achieve multicolor RTP from single-component materials. Actually, only scattered examples were reported on multicolor single-component RTP, in which feasible strategies were tried including construction of chromophores in isolated or aggregated states, multichromophore crosslinked copolymerization, and cluster-induced emission (CIE). [8] A single-component RTP material with dynamic color tuning from violet to green, for instance, was first reported by mixing molecular phosphorescence and H-aggregation phosphorescence. [8a] Analogous colortunable RTP from blue to yellow was achieved through incorporating two organic phosphorescence emitting centers into one polymer. [8e] Nonetheless, the color switching is relatively limited or saltatory in most reported single-component multicolor RTP (Table S1, Supporting Information), it remains highly Tunable full-color room temperature phosphorescence (RTP) is charming due to its potentials in multiple anticounterfeitings, all-color displays, and multichannel biomarkers. However, it is a huge challenge to achieve excitationdependent continuously adjustable full-color RTP from a single-component compound. Herein, two Zn(II)-based organic coordination polymers are reported, which are the first examples characterized by blue, cyan, green, yellow, orange, and red continuously tunable phosphorescence with decent quantum efficiencies in response to variation of excitation energy at ambient conditions. The unique photoluminescence behavior is induced by the selective formation and decay of multiple triplet excited states, i.e., ligand...
Room-temperature phosphorescence (RTP) materials with recognizable afterglow property have gained widespread attraction. Multicolor RTP has added benefits in multiplexed biological labeling, a zero background ratiometric sensor, a multicolor display, and other fields. However, it is a great challenge to prepare multicolor RTP from a single-component compound according to Kasha’s rule. Herein, we propose a strategy to design multicolor RTP in a metal–organic hybrid framework through constructing chromophores in both isolated state and dimer state using a flexible tetradentate ligand. Two compounds were synthesized that presented blue and green dual phosphorescence with different lifetimes at ambient conditions. The photoluminescence mechanism has been thoroughly studied by structure–property analysis. This study provides various possibilities to prepare high-performing RTP materials by the rational design and synthesis of similar compounds.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.