Colour tuning of garnet phosphor through codoping

Variation in animal coloration is often viewed as the result of chemically distinct pigments conferring different hues. The role of molecular environment on hue tends to be overlooked as analyses are mostly performed on free pigments extracted from the integument. Here we analysed psittacofulvin pigments within parrot feathers to explore whether the in situ organization of pigments may have an effect on hue. Resonance Raman spectra from a red region of a yellow-naped amazon Amazona auropalliata tail feather show frequency dispersion, a phenomenon that is related to the presence of a range of molecular conformations (and multiple chromophores) in the pigment, whereas spectra from a yellow region on the same feather do not show the same evidence for multiple chromophores. Our findings are consistent with non-isomeric psittacofulvin pigments behaving as a single chromophore in yellow feather barbs, which implies that psittacofulvins are dispersed into a structurally disordered mixture in yellow feathers compared with red feathers. Frequency dispersion in red barbs may instead indicate that pigments are structurally organized through molecule–molecule interactions. Major differences in the hues of parrot feathers are thus associated with differences in the organization of pigments within feathers.

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Novel bimetallic lanthanide metal–organic frameworks (Ln-MOFs) for colour-tuning through energy-transfer between visible and near-infrared emitting Ln3+ ions

Journal of Materials Chemistry C ◽

10.1039/c8tc06445h ◽

2019 ◽

Vol 7 (9) ◽

pp. 2751-2757 ◽

Cited By ~ 10

Author(s):

Min Zeng ◽

Chuanlang Zhan ◽

Jiannian Yao

Keyword(s):

Energy Transfer ◽

Near Infrared ◽

Metal Organic Frameworks ◽

Color Tuning ◽

Metal Organic ◽

Lanthanide Metal ◽

Colour Tuning

Controllable color-tuning has been achieved in a bimetallic Ln-MOF through energy transfer from visible-emitting to near-infrared-emitting Ln ions.

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Compositional variation dependent colour tuning and observation of Förster resonant energy transfer in Cd(1−x)ZnxS nanomaterials

New Journal of Chemistry ◽

10.1039/c9nj05199f ◽

2020 ◽

Vol 44 (3) ◽

pp. 870-883 ◽

Cited By ~ 1

Author(s):

Lakshmi Kumari ◽

Asit Kumar Kar

Keyword(s):

Energy Transfer ◽

Energy Level ◽

Energy Level Diagram ◽

Compositional Variation ◽

Transfer Energy ◽

Resonant Energy ◽

Spectral Overlap ◽

Resonant Energy Transfer ◽

Colour Tuning

Energy level diagram of FRET process in Cd(1−x)ZnxS nanomaterials between donor (ZnS) and acceptor (CdS): the smaller ZnS materials transfer energy nonradiatively to the larger CdS materials when there is sufficient spectral overlap between them.

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DEVELOPMENT AND CHARACTERISATION OF POLYFLUORENE BASED LIGHT EMITTING DIODES AND THEIR COLOUR TUNING USING FORESTER RESONANCE ENERGY TRANSFER

Solid State Ionics ◽

10.1142/9789812773104_0090 ◽

2006 ◽

Author(s):

P. C. MATHUR ◽

AMIT KUMAR ◽

P. K. BHATNAGAR ◽

K. TADA ◽

M. ONODA

Keyword(s):

Energy Transfer ◽

Light Emitting Diodes ◽

Resonance Energy Transfer ◽

Resonance Energy ◽

Light Emitting ◽

Colour Tuning

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Colour tuning and energy transfer pathways in MgAl 2 O 4 triply doped with 0.1% Ce 3+ , 0.1% Eu 2+ , x% Tb 3+(0⩽x⩽2%)nanocrystals synthesized using sol-gel process

Chemical Physics ◽

10.1016/j.chemphys.2017.02.009 ◽

2017 ◽

Vol 487 ◽

pp. 75-86 ◽

Cited By ~ 16

Author(s):

S.V. Motloung ◽

B.F. Dejene ◽

O.M. Ntwaeaborwa ◽

H.C. Swart ◽

R.E. Kroon

Keyword(s):

Energy Transfer ◽

Sol Gel ◽

Sol Gel Process ◽

Colour Tuning

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Colour tuning in human visual cortex measured with functional magnetic resonance imaging

Nature ◽

10.1038/40398 ◽

1997 ◽

Vol 388 (6637) ◽

pp. 68-71 ◽

Cited By ~ 222

Author(s):

Stephen Engel ◽

Xuemei Zhang ◽

Brian Wandell

Keyword(s):

Magnetic Resonance Imaging ◽

Visual Cortex ◽

Magnetic Resonance ◽

Functional Magnetic Resonance Imaging ◽

Functional Magnetic Resonance ◽

Resonance Imaging ◽

Human Visual Cortex ◽

Colour Tuning

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Functional up-converting SrTiO3:Er3+/Yb3+ nanoparticles: structural features, particle size, colour tuning and in vitro RBC cytotoxicity

Dalton Transactions ◽

10.1039/c5dt00671f ◽

2015 ◽

Vol 44 (22) ◽

pp. 10267-10280 ◽

Cited By ~ 4

Author(s):

R. Pazik ◽

M. Maczka ◽

M. Malecka ◽

L. Marciniak ◽

A. Ekner-Grzyb ◽

...

Keyword(s):

Particle Size ◽

Structural Features ◽

Annealing Temperatures ◽

Colour Tuning ◽

Co Doped

SrTiO3 nanoparticles co-doped with a broad concentration range of Er3+ and Yb3+ ions were fabricated using the citric route as a function of annealing temperatures of 500–1000 °C.

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Closing the Yellow Gap with Eu- and Tb-Doped GaN: One Luminescent Host Resulting in Three Colours

10.26434/chemrxiv.13473642 ◽

2020 ◽

Author(s):

Cordula Braun ◽

liuda Mereacre ◽

Zheng Chen ◽

Adam Slabon

Keyword(s):

Light Emitting Diodes ◽

Luminescence Properties ◽

Light Emitting ◽

Highly Efficient ◽

Bulk Gan ◽

Colour Tuning

GaN is a key material when it comes to highly efficient warm white all-nitride phosphor converted light emitting diodes (pc-LED). Here we present the doping of bulk GaN with Europium and Terbium and the combination of both resulting in intriguing luminescence properties, pushing the role of GaN:Eu,Tb as a chief component in future light emitiing diodes. By this colour tuning we prove that one luminescent host can provide three colours (red, green, orange) and even the so called "yellow gap" could be closed with a III-nitride.<br>

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Time-dependent solid-state molecular motion and colour tuning of host-guest systems by organic solvents

Nature Communications ◽

10.1038/s41467-019-13844-5 ◽

2020 ◽

Vol 11 (1) ◽

Cited By ~ 9

Author(s):

Yu-Dong Yang ◽

Xiaofan Ji ◽

Zhi-Hao Lu ◽

Jian Yang ◽

Chao Gao ◽

...

Keyword(s):

Solid State ◽

Organic Solvents ◽

Molecular Motion ◽

Dynamic Control ◽

Information Storage ◽

Time Dependent ◽

Temporal Response ◽

Guest Complex ◽

Host Guest Complex ◽

Colour Tuning

AbstractHost-guest complex solid state molecular motion is a critical but underexplored phenomenon. In principle, it can be used to control molecular machines that function in the solid state. Here we describe a solid state system that operates on the basis of complexation between an all-hydrocarbon macrocycle, D4d-CDMB-8, and perylene. Molecular motion in this solid state machine is induced by exposure to organic solvents or grinding and gives rise to different co-crystalline, mixed crystalline, or amorphous forms. Distinct time-dependent emissive responses are seen for different organic solvents as their respective vapours or when the solid forms are subject to grinding. This temporal feature allows the present D4d-CDMB-8⊃perylene-based system to be used as a time-dependent, colour-based 4th dimension response element in pattern-based information codes. This work highlights how dynamic control over solid-state host-guest molecular motion may be used to induce a tuneable temporal response and provide materials with information storage capability.

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