Enhanced photoluminescence and phosphorescence properties of red CaAlSiN3:Eu2+ phosphor via simultaneous UV-NIR stimulation
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Enhanced emission was observed under simultaneous UV-NIR stimulation due to the equilibrium of detrapping and retrapping of electrons in traps.Boric acid
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The phosphorescent state of the 1,2,4,5-tetracyanobenzene-naphthalene charge-transfer complex in rigid solution and in single crystal of 1:1 composition was studied in detail through measurements of the phosphorescence, phosphorescence excitation, E.S.R., and microwave-induced delayed phosphorescence spectra. From the analysis of these spectra it is concluded that there are two types of the complexes with different charge-transfer characters both in rigid solution and in crystal. The crystal was found to have three types of phosphorescent sites: Site 1, naphthalene as a shallow trap; Site 2, the complex, the phosphorescent state of which has the character of a locally (within naphthalene) excited triplet state perturbed by the charge-transfer interaction; Site 3, the complex, the phosphorescent state of which is mainly of charge-transfer triplet. Phosphorescence spectra from the individual sites were separately observed with the aid of the microwave-induced delayed phosphorescence technique. The temperature dependence of the phosphorescence spectrum in the crystalline state was explained by considering the energy transfer among these sites. In addition to the three types of phosphorescence, delayed charge-transfer fluorescence due to triplet-triplet annihilation was observed.
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Abstract Developing pure organic materials with ultralong lifetimes is attractive but challenging. Here we report a concise chemical approach to regulate the electronic configuration for phosphorescence enhancement. After the introduction of d–pπ bonds into a phenothiazine model system, a phosphorescence lifetime enhancement of up to 19 times was observed for DOPPMO, compared to the reference PPMO. A record phosphorescence lifetime of up to 876 ms was obtained in phosphorescent phenothiazine. Theoretical calculations and single‐crystal analysis reveal that the d–pπ bond not only reduces the (n, π*) proportion of the T 1 state, but also endows the rigid molecular environment with multiple intermolecular interactions, thus enabling long‐lived phosphorescence. This finding makes a valuable contribution to the prolongation of phosphorescence lifetimes and the extension of the scope of phosphorescent materials.
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Chromophore
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Persistent luminescence
Photoluminescence excitation
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Abstract Developing pure organic materials with ultralong lifetimes is attractive but challenging. Here we report a concise chemical approach to regulate the electronic configuration for phosphorescence enhancement. After the introduction of d–pπ bonds into a phenothiazine model system, a phosphorescence lifetime enhancement of up to 19 times was observed for DOPPMO, compared to the reference PPMO. A record phosphorescence lifetime of up to 876 ms was obtained in phosphorescent phenothiazine. Theoretical calculations and single‐crystal analysis reveal that the d–pπ bond not only reduces the (n, π*) proportion of the T 1 state, but also endows the rigid molecular environment with multiple intermolecular interactions, thus enabling long‐lived phosphorescence. This finding makes a valuable contribution to the prolongation of phosphorescence lifetimes and the extension of the scope of phosphorescent materials.
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