Advanced Science
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2017
·Vol. 4
·期 4
·1600166
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IF 9.034
Tingting Li,Dongliang Yang,Liuqing Zhai,Suiliang Wang,Baomin Zhao,Nina Fu,Lianhui Wang,Youtian Tao,Wei Huang
The fluorophores with long-lived fluorescent emission are highly desirable for time-resolved fluorescence imaging (TRFI) in monitoring target fluorescence. By embedding the aggregates of a thermally activated delayed fluorescence (TADF) dye, 2,3,5,6-tetracarbazole-4-cyano-pyridine (CPy), in distearoyl-sn-glycero-3-phosphoethanolamine-poly(ethylene glycol) (DSPE-PEG2000) matrix, CPy-based organic dots (CPy-Odots) with a long fluorescence lifetime of 9.3 μs (in water at ambient condition) and high brightness (with an absolute fluorescence quantum efficiency of 38.3%) are fabricated. CPy-Odots are employed in time-resolved and confocal fluorescence imaging in living Hela cells and in vivo. The green emission from the CPy-Odots is readily differentiated from the cellular autofluorescence background because of their stronger emission intensities and longer lifetimes. Unlike other widely studied DSPE-PEG2000 encapsulated Odots which are always distributed in cytoplasm, CPy-Odots are located mainly in plasma membrane. In addition, the application of CPy-Odots as a bright microangiography agent for TRFI in zebrafish is also demonstrated. Much broader application of CPy-Odots is also prospected after further surface functionalization. Given its simplicity, high fluorescence intensity, and wide availability of TADF materials, the method can be extended to develop more excellent TADF Odots for accomplishing the challenges in future bioimaging applications.
研究领域:
生物医学工程
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生物成像
·
材料科学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science Advances
·
2017
·Vol. 3
·期 5
·
IF 0
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
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荧光材料
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无机化学
✓ 已验证
DOI
CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Li-Ping Bai,Shu-Jia Zheng,Rui Xue,Deng-Feng Li,Ke-Die Li,Si-Qi Yu,Yuan Liu,Tian-Yi Li
As the most readily accessible N-heterocyclic carbenes (NHCs), imidazolium carbenes have traditionally been ruled out for the design of TADF coinage metal carbene–metal–amine (CMA) complexes due to their high-lying unoccupied π orbitals, which lead to a dark interligand charge transfer (ICT) state. In this work, in cooperation with strong electron-donating acridine ligands, a series of CMA complexes featuring imidazolium carbenes are prepared, exhibiting desired blue thermally activated delayed fluorescence (TADF) with high photoluminescent (PL) quantum yields (ΦPL) close to unity and emission decay lifetimes as short as 1.0 μs. The small energy differences between S1 and T1 (ΔEST) of around 100 meV and the high radiative decay rates of S1 on the order of 1 × 107–108 s–1 contribute to the decent TADF behavior. Solution-processed blue OLEDs based on the Cu(I) emitter show an external quantum efficiency (EQE) exceeding 8.0%, demonstrating the practicality of using imidazolium carbenes in the design of TADF CMA luminophores.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
DOI
高影响因子
Chemical Science
·
2024
·Vol. 15
·期 8
·2954-2962
·
IF 7.6
Chuying Wang,Wen Meng,Guigen Luo,Guangyong Xu,Min Peng,Bin Xu,Shuming Nie,Zhengtao Deng
Materials with two or more fluorescence features under different excitation sources have great potential in optical applications, but luminous materials with three emission characteristics have been largely undeveloped. Here, we report a novel zero-dimensional (0D) organic–inorganic hybrid ((C2H5)4N)2ZrCl6 perovskite with multiple emissions. The zirconium-based perovskite exhibits a red emission around 620 nm, a green emission at 527 nm, and a blue emission around 500 nm. The red and green emissions come from self-trapped excitons (STEs) and the d–d transitions of Zr(IV), respectively, which are caused by distortion of the [ZrCl6]2− octahedra. The blue emission is caused by thermally activated delayed fluorescence (TADF), which is similar to that of Cs2ZrCl6. The absolute photoluminescence quantum yield (PLQY) of the red and blue double emission is up to 83% and the PLQY of the green emission is 27%. With different combinations of ((C2H5)4N)2ZrCl6 samples, we achieve a variety of applications, including a two-color luminescent anti-counterfeiting device, a white light-emitting diode (WLED) with a color rendering index (CRI) of 95 and information encryption with different excitations. We also synthesize other hybrid zirconium perovskites with tri-luminescence through a similar method. Our work provides a potential set of excitation-dependent luminescent materials and is expected to expand the basic research and practical applications of multi-luminescence materials.
研究领域:
材料科学
·
光学
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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