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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY · 2021 · IF 4.098

Large-scale sensitivity adjustment for Gd-HMME room temperature phosphorescence oxygen sensing

Honglin Zhang,Ting Liu,Qiuhe Li,Xiyu Zhang,Hua Zhao,Yangdong Zheng,Feng Qin,Zhiguo Zhang,Tianqi Sheng,Ye Tian

The oxygen sensing enhancement based on room temperature phosphorescence (RTP) of Gd-HMME adjusted by imidazole was studied. The phosphorescence intensity I P0 and the Stern-Volmer equations under different imidazole concentration were obtained, and the physical mechanism of imidazole regulating the oxygen quenching constant K SV was analyzed. It was found that the K SV value increased by ∼46 folds in the range of 12.4(1)–576.1(5) kPa −1 , and the large-scale variation of K SV is conducive to the realization of high precision oxygen concentration measurement in a wide range. In addition, the standard deviation σ of continuous measurement results was given, and the limit of detection (LOD) was determined to be 6.6 ppm.

CAS / MDL: 10138-52-0 288-32-4

研究领域: 分析化学 · 材料科学 · 生物医学工程

✓ 已验证产品关联 DOI PubMed 高影响因子

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Science Advances · 2017 ·Vol. 3 ·期 5 · IF 0

Carbon dots in zeolites: A new class of thermally activated delayed fluorescence materials with ultralong lifetimes

Jiancong Liu,Ning Wang,Yue Yu,Yan Yan,Hongyue Zhang,Jiyang Li,Jihong Yu

Thermally activated delayed fluorescence (TADF) materials are inspiring intensive research in optoelectronic applications. To date, most of the TADF materials are limited to metal-organic complexes and organic molecules with lifetimes of several microseconds/milliseconds that are sensitive to oxygen. We report a facial and general “dots-in-zeolites” strategy to in situ confine carbon dots (CDs) in zeolitic matrices during hydrothermal/solvothermal crystallization to generate high-efficient TADF materials with ultralong lifetimes. The resultant CDs@zeolite composites exhibit high quantum yields up to 52.14% and ultralong lifetimes up to 350 ms at ambient temperature and atmosphere. This intriguing TADF phenomenon is due to the fact that nanoconfined space of zeolites can efficiently stabilize the triplet states of CDs, thus enabling the reverse intersystem crossing process for TADF. Meanwhile, zeolite frameworks can also hinder oxygen quenching to present TADF behavior at air atmosphere. This design concept introduces a new perspective to develop materials with unique TADF performance and various novel delayed fluorescence–based applications.

研究领域: 材料科学 · 光电子学 · 纳米技术 · 荧光材料 · 无机化学

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OPTICS EXPRESS · 2025 ·Vol. 33 ·期 11 ·22185-22195 · IF 3.3

Determination of the T1 state energy levels of metalloporphyrins using temperature-dependent time resolved spectroscopy

Lu Li,Feng Qin,Zhiguo Zhang,Zhiguo Zhang,Tao Jia

The determination of the energy of the lowest triplet excited state (ET1) for metalloporphyrin photosensitizers, a key parameter for rationalizing energy transfer processes in metalloporphyrins, facilitates a better understanding and optimization of their functionality. In this study, a strategy was proposed for determining the ET1 values in metalloporphyrin systems by analyzing the temperature dependence of the oxygen quenching rate constant using time-resolved spectroscopy, with Platinum(II) octaethylporphyrin (PtOEP) and Palladium(II) octaethylporphyrin (PdOEP) as representative examples. Through a thermal equilibrium approximation of the excited triplet state (T1) and the excited state of oxygen, a theoretical model was introduced in which the oxygen quenching rate exhibits a nonlinear dependence on temperature, enabling the determination of ET1 values. Additionally, the validity of this approach was demonstrated through excitation spectra of metalloporphyrins. Our work provides an effective pathway and offers new insights into the energy-loss mechanisms involved in related photoconversion processes.

CAS / MDL: 24804-00-0 31248-39-2

研究领域: 物理化学 · 光化学 · 光谱学 · 材料科学 · 分子物理学

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Large-scale sensitivity adjustment for Gd-HMME room temperature phosphorescence oxygen sensing

Carbon dots in zeolites: A new class of thermally activated delayed fluorescence materials with ultralong lifetimes

Determination of the T1 state energy levels of metalloporphyrins using temperature-dependent time resolved spectroscopy