Phosphorescence dynamic behavior of metalloporphyrins in methanol-dimethyl sulfoxide liquid mixtures

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2024-12-19 DOI:10.1016/j.jlumin.2024.121039

Lu Li , Feng Qin , Yongda Wang , Lixin Peng , Meng Kou , Zhiguo Zhang , Tao Jia

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Abstract

Metalloporphyrins with room-temperature phosphorescence (RTP) demonstrate great potential in information security and optoelectronic devices. However, the effects of different proportions of alcohols and binary mixtures on phosphorescence remain unclear, owing to varying nonradiative transition rate (k_nP) across different solvents. In this study, we investigated the phosphorescence behavior of Platinum(II) meso-tetraphenylporphyrin (Pt-TPP) in different proportions of methanol-dimethyl sulfoxide (DMSO) liquid mixtures. The changes in the phosphorescence characteristics of Pt-TPP in solvents with varying ratios of methanol and DMSO were assessed through photoluminescence and time-resolved spectroscopy, and the observed variation in phosphorescence was attributed exclusively to k_np. The increase of k_np is attributed to the gradual narrowing of the energy gap between the excited triplet state of Pt-TPP and the energy levels of the two-component mixed solvent, and k_np follows a mono-exponential trend with the energy gap. A linear relationship between the energy gap and the solvent composition was then established by analyzing the absorption spectra of mixtures with varying solvent proportions. Furthermore, a model was proposed to explain that k_np exhibits a nonlinear dependence on solvent concentration, as well as the solvent-induced variations in phosphorescence.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.