A saturated red color converter for visible light communication using a blend of star-shaped organic semiconductors

Sajjad, Muhammad T.; Manousiadis, Pavlos; Orofino, C.; Kanibolotsky, Alexander L.; Findlay, Neil J.; Rajbhandari, Sujan; Vithanage, Dimali A.; Chun, Hyunchae; Faulkner, Grahame; O’Brien, Dominic; Skabara, Peter J.; Turnbull, Graham A.; Samuel, Ifor D. W.

doi:10.1063/1.4971823

Cited by 18 publications

(20 citation statements)

References 18 publications

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“…However, no photo‐induced electron or energy transfers were observed in these cases. Conversely, there are multiple studies on energy transfer processes in porphyrin‐ and Bodipy‐ containing branches of star shaped molecules and dendrimers, making these chromophores, dyes of choice for probing the interactions between the branches and the functional central core. In order to promote the energy transfer operating through a Dexter mechanism (i.e.…”

Section: Introductionmentioning

confidence: 99%

Azophenine as Central Core for Efficient Light Harvesting Devices

Karsenti

Harvey

2018

ChemPhysChem

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The notoriously non-luminescent uncycled azophenine (Q) was harnessed with Bodipy and zinc(II)porphyrin antennas to probe its fluorescence properties, its ability to act as a singlet excited state energy acceptor and to mediate the transfer. Two near-IR emissions are depicted from time-resolved fluorescence spectroscopy, which are most likely due to the presence of tautomers of very similar calculated total energies (350 cm ; DFT; B3LYP). The rates for energy transfer, k (S ), for Bodipy*→Q are in the order of 10 -10 s and are surprisingly fast when considering the low absorptivity properties of the lowest energy charge transfer excited state of azophenine. The rational is provided by the calculated frontier molecular orbitals (MOs) which show atomic contributions in the C H C≡CC H arms, thus favoring the double electron exchange mechanism. In the mixed-antenna Bodipy-porphyrin star molecule, the rate for Bodipy*→porphyrin has also been evaluated (≈16×10 s ) and is among the fastest rates reported for Bodipy-zinc(II)porphyrin pairs. This astonishing result is again explained from the atomic contributions of the C H C≡CC H and C≡CC H arms thus favouring the Dexter process. Here, for the first time, this process is found to be sensitively temperature-dependent. The azophenine turns out to be excellent for electronic communication.

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Section: Introductionmentioning

confidence: 99%

Azophenine as Central Core for Efficient Light Harvesting Devices

Karsenti

Harvey

2018

ChemPhysChem

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“…The transition from T 1 to ground state (known as phosphorescence) has low probability, resulting in a much slower decay time (10 −3 -10 2 s). (c) A comparison plot of the time response for various colour converter materials: a commercial YAG yellow phosphor (CL-827), a CdSe quantum dot, a custom-synthesized BODIPY molecule with oligofluorene arms (Y-BODIPY) [35], the commercial fluorescent polymer 'super yellow' (SY) and two custom-synthesized fluorescent polymers (BBEHP-PPV [34] and BBEHBO-PPV [38]). (d) Chemical structure of the various materials presented in (c).…”

Section: Organic Semiconductors As Colour Converters In Visible Lightmentioning

confidence: 99%

Organic semiconductors for visible light communications

Manousiadis

Yoshida

Turnbull

et al. 2020

Phil. Trans. R. Soc. A.

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Organic semiconductors are an important class of optoelectronic material that are widely studied because of the scope for tuning their properties by tuning their chemical structure, and simple fabrication to make flexible films and devices. Although most effort has focused on developing displays and lighting from these materials, their distinctive properties also make them of interest for visible light communications (VLCs). This article explains how their properties make them suitable for VLC and reviews the main uses that have been explored. On the transmitter side, record white VLC communication has been achieved by using organic semiconductors as colour converters, while direct modulation of organic light-emitting diodes is also possible and could be of interest for display-to-display communication. On the receiver side, organic solar cells can be used to harvest power and data simultaneously, and fluorescent antennas enable fast and sensitive receivers with large field of view. This article is part of the theme issue ‘Optical wireless communication’.

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“…However, in many cases, the lower luminance of OLEDs relative to, e.g., inorganic GaN LEDs represents a challenge, in particular as the driving voltage available from CMOS chips is limited (often to 5 V) . Applications that would benefit from OLEDs with increased luminance include visible‐light communication, lasers, or biomedical uses, e.g., in cancer treatment through photodynamic therapy, sensors, imaging, and most recently optogenetics, which is an emerging neuroscience technology that allows optical activation and silencing of genetically modified nerve cells with great specificity . In many of these areas, the desired luminance is orders of magnitude higher than for displays and even general illumination.…”

Section: Introductionmentioning

confidence: 99%

Development of Very High Luminance p–i–n Junction‐Based Blue Fluorescent Organic Light‐Emitting Diodes

Deng

Murawski

Keum

et al. 2020

Advanced Optical Materials

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Organic light‐emitting diodes (OLEDs) can emit light over much larger areas than their inorganic counterparts, offer mechanical flexibility, and can be readily integrated on various substrates and backplanes. However, the amount of light they emit per unit area is typically lower and the required operating voltage is higher, which can be a limitation for emerging applications of OLEDs, e.g., in outdoor and high‐dynamic‐range displays, biomedical devices, or visible‐light communication. Here, high‐luminance, blue‐emitting (λpeak = 464 nm), fluorescent p–i–n OLEDs are developed by combining three strategies: First, the thickness of the intrinsic layers in the device is decreased to reduce internal voltage loss. Second, different electron‐blocking layer materials are tested to recover efficiency losses resulting from this thickness reduction. Third, the geometry of the anode contact is optimized, which leads to a substantial reduction in the in‐plane resistive voltage losses. The OLEDs retain a maximum external quantum efficiency of 4.4% as expected for an optimized fluorescent device and reach a luminance of 132 000 cd m−2 and an optical power density of 2.4 mW mm−2 at 5 V, a nearly eightfold improvement compared to the original reference device.

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A saturated red color converter for visible light communication using a blend of star-shaped organic semiconductors

Cited by 18 publications

References 18 publications

Azophenine as Central Core for Efficient Light Harvesting Devices

Azophenine as Central Core for Efficient Light Harvesting Devices

Organic semiconductors for visible light communications

Development of Very High Luminance p–i–n Junction‐Based Blue Fluorescent Organic Light‐Emitting Diodes

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