Tunable luminescence and white light emission of porphyrin-zinc coordination assemblies

Bipodal ligand 5,15-bis(4-carboxyphenyl) porphyrin (H[Formula: see text]DCPP) was designed and synthesized. By adjusting the molar ratio of H[Formula: see text]DCPP, ancillary ligand 4,4-bipyridine (bpy) and zinc acetate salts, three novel coordination assemblies, namely, zero-dimensional dimeric [Zn[Formula: see text](H[Formula: see text]DCPP)[Formula: see text] ·bpy] ·4H[Formula: see text]O ·4DMF (Zn-D), two-dimensional polymeric {[Zn[Formula: see text](DCPP) ·bpy[Formula: see text] ·H[Formula: see text]O ·DMF[Formula: see text]] ·solvent}[Formula: see text] (Zn-2D), and three-dimensional polymeric [Zn[Formula: see text](DCPP) ·bpy[Formula: see text]][Formula: see text] (Zn-3D) were assembled. Due to the delicate integration of multiple chromophores in the coordination space combining bpy, DCPP and MLCT emissions together, photoluminescence (PL) of the three porphyrin-zinc coordination assemblies differ from each other and color tone is tunable from blue to orange with changes of the excitation wavelength. In particular, white light emission (WLE) can be observed by the excitation of 270 to 290 nm, representing the first examples of single component WLE compounds based on porphyrin ligands. Furthermore, temperature-dependent luminescence results in a linear [Formula: see text]–[Formula: see text] relationship in Zn-2D and Zn-3D assemblies, applicable for long wavelength red-emitting thermometers.

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Secondary Through-Space Interactions: Achieving Single-Molecule White-Light Emission from Clusteroluminogens with Isolated Phenyl Rings

10.26434/chemrxiv-2022-6mctw ◽

2022 ◽

Author(s):

Jianyu Zhang ◽

Parvej Alam ◽

Siwei Zhang ◽

Hanchen Shen ◽

Lianrui Hu ◽

...

Keyword(s):

Single Molecule ◽

White Light ◽

Light Emission ◽

Photophysical Properties ◽

White Light Emission ◽

Excitation Wavelength ◽

Conjugated Molecules ◽

Long Wavelength ◽

Phenyl Rings ◽

Donor Acceptor

Clusteroluminogens (CLgens) refer to some non-conjugated molecules that show visible light due to the formation of aggregates and unique electronic properties with through-space interactions (TSI). Although mature and systematic theories of molecular photophysics have been developed to study conventional conjugated chromophores, it is still challenging to endow CLgens with designed photophysical properties by manipulating TSI. Herein, three CLgens with non-conjugated donor-acceptor structures and different halide substituents with secondary TSI are designed and synthesized. These molecules show multiple emissions and even white-light emission in the crystalline state and the intensity ratio of these multiple emission peaks is easily manipulated by changing the halide atom and excitation wavelength. Experimental and theoretical results successfully disclose the electronic nature of these multiple emissions: through-space conjugation for short-wavelength fluorescence, through-space charge transfer based on secondary TSI for long-wavelength fluorescence, and room-temperature phosphorescence. The introduction of secondary TSI to CLgens not only enriches their varieties of photophysical properties but also inspires the establishment of novel aggregate photophysics for clusteroluminescence.

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Accurate tuning of rare earth metal–organic frameworks with unprecedented topology for white-light emission

Journal of Materials Chemistry C ◽

10.1039/c9tc05471e ◽

2020 ◽

Vol 8 (4) ◽

pp. 1374-1379 ◽

Cited By ~ 4

Author(s):

Yutong Wang ◽

Kai Zhang ◽

Xiaokang Wang ◽

Xuelian Xin ◽

Xiurong Zhang ◽

...

Keyword(s):

White Light ◽

Light Emission ◽

Metal Organic Frameworks ◽

Three Dimensional ◽

Earth Metal ◽

White Light Emission ◽

One Dimensional ◽

1D Chain ◽

Secondary Building Units ◽

Metal Organic

An unprecedented three-dimensional (3D) (3,4,5)-czkf topological framework (UPC-38) with one-dimensional (1D) chain secondary building units exhibits strong white light emission.

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Dopant and excitation wavelength dependent color tunability in Dy3+:YVO4 and Dy3+/Eu3+:YVO4 microparticles towards white light emission

Dalton Transactions ◽

10.1039/c6dt02347a ◽

2016 ◽

Vol 45 (41) ◽

pp. 16231-16239 ◽

Cited By ~ 24

Author(s):

Anna M. Kaczmarek ◽

Dorine Ndagsi ◽

Rik Van Deun

Keyword(s):

White Light ◽

Light Emission ◽

White Light Emission ◽

Excitation Wavelength ◽

Emission Color ◽

Color Tunability

The emission color of Dy:YVO4 and Dy,Eu:YVO4 microstructures could be tuned towards white light and white light with a yellow undertone through varying the Ln3+ doping percentages as well as the excitation wavelengths.

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Single-Component White Light Emitting CdSexSy Alloy Nanocrystals Through Phosphine-Free Route

10.26434/chemrxiv.12643475.v1 ◽

2020 ◽

Author(s):

Shilpi Jaiswal ◽

Jyotsana Pathak ◽

Abhijit Patra

Keyword(s):

Quantum Yield ◽

White Light ◽

Light Emission ◽

Semiconductor Nanocrystals ◽

White Light Emission ◽

Molar Ratio ◽

Visible Range ◽

One Pot ◽

Light Emitting ◽

Hydrogel Matrix

Semiconductor nanocrystals are promising for display and lighting devices. Herein, we report a facile one-pot synthetic route to fabricate white light emitting CdSexSy nanocrystals with enhanced quantum yield using CdO, S powder, and Se powder as precursors. The phosphine-free route was adopted, employing paraffin oil as the reducing agent and solvent for the fabrication. The optical properties can be effectively tailored by controlling the reaction time and the molar ratio of Se/S. The emission of pristine CdSexSy nanocrystals covered a broad visible range from 400 to 750 nm. The CdSexSy nanocrystals (Se/S = 0.4) exhibited white-light emission with quantum yield of 50 ± 3 % and Commission Internationale de l'Eclairage (CIE) chromaticity coordinates of (0.30, 0.31). The band-edge (~400-450 nm) to trap-state (~550-750 nm) emissions was tuned by controlling the Se/S ratio, and the different shades of white light were obtained. Furthermore, the quantum yield and CIE coordinates of the CdSexSy nanocrystals (Se/S = 0.4) were found to be similar even after 30 days of fabrication, showing the high stability of nanocrystals. The white light emission was retained in nanocrystals-embedded poly(methyl methacrylate) (PMMA) thin film and also in the hydrogel matrix. The one-pot, low-cost, scalable fabrication of white light emitting CdSexSy nanocrystals demonstrated in the present study offers promising scope in the solid-state display applications. <br>

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White-light emission from a structurally simple hydrazone

Chemical Communications ◽

10.1039/c9cc03912k ◽

2019 ◽

Vol 55 (64) ◽

pp. 9551-9554 ◽

Cited By ~ 8

Author(s):

Baihao Shao ◽

Nell Stankewitz ◽

Jacob A. Morris ◽

Matthew D. Liptak ◽

Ivan Aprahamian

Keyword(s):

White Light ◽

Light Emission ◽

Fluorescence Emission ◽

White Light Emission ◽

Excitation Wavelength ◽

Dual Fluorescence

Two hydrazones featuring a unique excitation wavelength-dependent dual fluorescence emission have been developed.

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Influence of synthesis conditions on the morphologies of ReBO3 microstructures and white light emission of YBO3:Eu3+ phosphors prepared by an oleic acid-assisted hydrothermal method

RSC Advances ◽

10.1039/c6ra13370c ◽

2016 ◽

Vol 6 (73) ◽

pp. 69442-69453 ◽

Cited By ~ 2

Author(s):

Baobao Liu ◽

Xiuzhen Xiao ◽

Jun Yu ◽

Dongsen Mao ◽

Guanzhong Lu

Keyword(s):

Oleic Acid ◽

Hydrothermal Method ◽

White Light ◽

Light Emission ◽

Dopant Concentration ◽

White Light Emission ◽

Excitation Wavelength ◽

Synthesis Conditions ◽

Light Color ◽

The Eu

YBO3:5%Eu3+ phosphor prepared by the OA-assisted hydrothermal method displays the white color under excitation at 394 nm, and the light color of YBO3:Eu3+ can be varied with the Eu3+ dopant concentration or the excitation wavelength.

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Color-tunable and white-light emission of one-dimensional l-di-2-thenoyltartaric acid mixed-lanthanide coordination polymers

Dalton Transactions ◽

10.1039/c4dt03457k ◽

2015 ◽

Vol 44 (10) ◽

pp. 4640-4647 ◽

Cited By ~ 33

Author(s):

Chang Feng ◽

Jing-Wen Sun ◽

Peng-Fei Yan ◽

Yu-Xin Li ◽

Tian-Qi Liu ◽

...

Keyword(s):

Coordination Polymers ◽

White Light ◽

Light Emission ◽

White Light Emission ◽

Excitation Wavelength ◽

One Dimensional ◽

Lanthanide Coordination Polymers ◽

Color Tunable

l-Di-2-thenoyltartaric acid mix-lanthanide coordination polymers with one-dimensional ladder-like chain structures present color-tunable and white-light emission upon varying the excitation wavelength.

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Tunable luminescence and white light emission of mixed lanthanide–organic frameworks based on polycarboxylate ligands

Journal of Materials Chemistry C ◽

10.1039/c5tc04432d ◽

2016 ◽

Vol 4 (16) ◽

pp. 3364-3374 ◽

Cited By ~ 86

Author(s):

Jiawei Wu ◽

Huabin Zhang ◽

Shaowu Du

Keyword(s):

White Light ◽

Light Emission ◽

Relative Concentration ◽

White Light Emission ◽

Excitation Wavelength

This review highlights the luminescence tuning and white light emission of aromatic polycarboxylate-based mixed Ln-MOFs by changing the relative concentration of the constituent Ln3+ ions or the excitation wavelength.

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